Phase coded Costas signals for ambiguity function improvement and grating lobes suppression

Size: px
Start display at page:

Download "Phase coded Costas signals for ambiguity function improvement and grating lobes suppression"

Transcription

1 Phase coded Costas signals for ambiguity function improvement and grating lobes suppression Nadjah. TOUATI Charles. TATKEU Atika. RIVENQ Thierry. CHONAVEL Abstract A novel radar signal is proposed based on modification of Costas signals by increasing the frequency separation of Costas frequency hops beyond the orthogonally condition (t b. f > 1). The approach consists on phase coding sub pulses with appropriate codes in order to lower autocorrelation grating lobes, that would normally appear when the orthogonality condition is not satisfied. Index Terms Pulse compression, Costas arrays, Grating lobes, Phase codes, Ambiguity function I. INTRODUCTION Pulse compression techniques have been widely used in many modern radar systems. The transmitted pulse is modulated to get large time-bandwidth product BT. In receiver side, the target echo signal is passed through a matched filter and results in an extremely narrow impulse with a large peak value, thus the transmitted pulse is compressed in time domain. Pulse compression combines the advantage of high energy of a long pulse with the high resolution of a short pulse. Today, most famous compression techniques in radar technology are frequency modulation signals and phase coded signals [1]. linear frequency modulated LFM signals achieve good ambiguity function but present the drawback of high sidelobes level which necessits withening techniques to overcome it. Phase coded signals can decrease the sidelobes level efficiently and are compatible with new digital signal processing hardware. Costas signals or Costas arrays are a variant of frequency modulated radar signals [2]. Their randomlike frequency evolution enables them to best achieve the thumbtack ambiguity function while minimising the crosstalk between frequencies. forms of reducing the level of grating lobes, using phase coding in the sub pulses when tb. f > 1. Indeed, we will see that coding Costas sub-pulses with good autocorrelation properties codes reduces the level of grating lobes. The extension of the work will be to use a family of codes to encode Costas sub pulses instead of a same code. Phase coding Costas sub-pulses is present in some works in the literature. In [4], the authors propose Costas PSK signals using several phase codes in the sub-pulses in order to evaluate their low probabilite of intercept (LPI) performance. For their part, the authors of [5] used a pair of Golay complementary codes to encode Costas sub pulses. The approach is interesting since the transmitted signal is coded by the first code of the pair, and is combined in reception, with its coded version by the second code of the pair, leading to a remarkable reduction in sidelobes. The same approach was proposed by the authors of [6] but using other complementary codes: Welti codes. We note that for all previous works on phase-coded Costas pulses, the study was limited to tb. f = 1. A. Basic Costas signals II. COSTAS SIGNALS Frequency evolution of a Costas signal consists on a M length randomlike time-frequency code. Un example of M=8 is described in Figure 1. The main feature of these codes is that a single frequency is emitted in each bit of duration tb and this frequency is used only once. Costas signals are used in their simple version with constant frequency pulses and modified versions using sub pulse modulation. However, few works treat Costas signals beyond the orthogonality condition (frequency separation equal to the inverse of bit duration tb. f = 1). In [3],the authors propose replacing constant frequency sub pulses by LFM ones to overcome the problem of grating lobes that appear in the case where the condition orthogonality is not respected (tb. f > 1 ). In our case, we are interested in other Fig. 1. Example of costas array of size M=8, code=[2,6,3,8,7,5,1,4]

2 Another property is that these codes minimize the coincidences between the signal and its time delayed and frequency shifted copy. Hence, There is one coincidence at most outside the origin and a total coincidence at the origin which allow to better approximation of the ideal ambiguity function. The principle is described in Figure 2 and the corresponding ambiguity function is described in Figure 3. f = 1/t b (1) The time-bandwith Product BT achieved in these conditions is M M [1]. Hence, the relevance of the signals increases by increasing the size of Costas codes. However, This condition is sometimes restrictive; we need to increase signal duration to acheive the needed bandwith. In certain applications, Signal duration is limited by radar measurement ambiguities and the bandwith must be sweep in minimum time. This is allowed by increasing frequency separation in costas signals. Fig. 2. Illustration of costas signals pricnipal, one coincidence at maximum f > 1/t b (2) The corresponding time-bandwith Product BT is approximately (M M) t b. f. We show an example in Table I,where the needed bandwith is B = 4GHz and bit duration is fixed at 10ns. Frequency separation f is calultaed in two cases: t b. f = 1 and t b. f > 1. The needed Costas size M in each case and the corresponding signal duration T = M.t b are presented. We notice that the time resolution acheived in all cases is 1/B = 25ns. t b. f f(mhz) Costas size M signal duration T (ns) TABLE I EXAMPLE OF COSTAS SIGNAL PARAMETERS WITH AND WITHOUT RESPECTING ORTHOGONALITY CONDITION Fig. 3. Ambiguity function of the Costas signal described in Figure 1 Litterature prpose algorithms for building those codes (Welch and Golomb algorithms). A more general approach consists on searching among all possible sequences of length M (M! sequences), those of them which obey to the properties of Costas, using the difference matrix method [2]. However, the search becomes computationaly expensive when M becomes large. B. Modified Costas signals The orthogonality condition of frequency hops in costas signals requires that frequency separation f is equal to the inverse bit duration t b [2]. Selecting the best configuration must result from a compromise between relevance and low sidelobe level (requires a large M) and limitation of duration signal (requires a small M). Intermediate choice achieves both. Another advantage of changing frequency spacing beyond the inverse bit duration is that it minimizes overlaping between neihgbour frequencies leading to lower sidelobes. However, this modification of Costas signals is not without consequences and leads to the appearance of grating lobes around the main lobe. C. Grating lobes Figure 4 show the ambiguity function of the costas signal in Figure 1 with t b. f = 5. Grating lobes surround the main lobe at τ < t b region. We note that the bandwith is larger and consequently the main lobe is finer allowing to achieve a better temporal resolution. Grating lobes effect became increasingly important when the product t b. f is increased. Grating lobes are not particular to modfied costas signals. Indeed, this phenomenon appears for all stepped frequency signals where orthogonality condition is not satisfied. Litterature propose reducing grating lobes by replacing fixed frequency sub pulses with LFM ones [7]. The approach proposed in this

3 Another codes are normally derived from the phase history of frequency-modulated pulse called chirplike codes. The Frank code and the P1 and P2 codes, are derived from LFM phase history and are only applicable for perfect square length L = k 2. Another polyphase codes derived from the LFM pulse are Zadoff-chu, P3 and P4 codes. Unlike Frank, P1, and P2 codes, these codes are defined for any arbitrary length L. A more general approach for deriving polyphase codes is based from synthetisng these codes from a given energy density function. The phase history is carried out from this function based on the stationary phase theorem. In cas of NLFM pulse, The derived polyphase codes are called P(n, k), where k and n are free parameters need to be determined. Fig. 4. Ambiguity function of Costas signal described in Figure 1 when t b. f = 5 (Grating lobes) last and also used in [3] is interesting insofar as it places nulls of single LFM pulses exactly where the grating lobes are located, and thus remove them completely. This took place under the restrictions of appropriate choise of the couple: LFM bandwith and frequency spacing (B, f). The same approach was discussed in [8] for a stepped frequency train but using NLFM pulses to eliminate grating lobes instead of LFM ones. In our case, we propose to lower grating lobes using phase coding in sub-pulses. Indeed, we will show that coding subpulses with good autocorrelation properties codes will lower the grating lobes to a significant level. We will use later, not a single code in sub-pulses, but a family of codes to better diversfy the signal and hence allow better lowring of grating lobes and ambiguity function sidelobes. III. PHASE CODED COSTAS SIGNALS A. Review on phase codes Phase codes had been largely studied in litterature [1]. They fit into two main families: binary codes and polyphases codes. a) Binary codes: Binary phase codes were originally developed in which the phase elements are restricted to 0 or π. Probably the most famous family of phase codes are Barker codes. These last present good autocrrelation proporeties (peak to peak sidelobe limited to 1) and simplicity in generation. However, there main drawback is there limited number ; there is no Barker codes exist for length L > 13. b) Polyphase codes: Polyphase codes have no restriction on code elements. We find in litterature a Polyphase version of Barker codes. c) Family codes: Using family of codes is sometimes preferable in radar context in order to introduce diversity. The proporeties of these codes depend the intented application. In radar diversity it is preferable to use compelmentary families and combine them in reception to have an ideal autocorrelation function. Golay codes are the most famous complementary codes. Ideal complementarity is sometimes difficult to achieve and we simply consider sub complementarity of codes. A subcomplementary codes family is often derived by circular shifting a chriplike code. In a multi-user context, orthogonality is better needed to distinguosh between users and limit the interefrence. Hadamard codes are the most famous and simple orthogonal codes. However, these codes have poor correlation propreties making them adapted to our application. A modified version of Hadamrad families was proposed in [9] where spectral efficiency and correlation propreties are largely improved. This codes are used to phase coding costas sub-pulses since they allow diversifying sub-pulses and keeping good correlation propereties. B. phase coded Costas signals Phase coding Costas sub-pulses in case of t b. f > 1 came from the fact that, more the signal in the sub-pulse has good autocorrelation proporties the better the elimination of grating lobes will be. In fact, in [3], it was shown that the autocorrelation function R(τ) near the main lobe τ < t b is defined by the product of two functions, R 1 (τ),r 2 (τ). R 1 (τ) is the autocorrelation function of the signal that constitue the Costas sub-pulse while R 2 (τ) is a function that describe the distribution of the grating lobes in this region according to the t b. f product. R( τ ) = R 1 ( τ ).R 2 ( τ ) = R 1 ( τ sin(mt b f τ t ). b ) t b t b t b t b Msin(Mt b f τ t b ) τ < t b Then, grating lobes appear at (maximum of R 2 (τ) ): τ = (3) k t b. f.t b k = 0, ±1, ±2... t b. f (4)

4 This justify the triangular diminution of grating lobes in the case of square pulse (triangular autocorrelation). In the case of LFM in [3], R 1 (τ) nuls were shaped using the bandwith B in order to coincide with grating lobes. when t b. f = 5 the correponding LFM bandwith must be t b.b = In our case, we propose to use a good correlation code: Barker 13 in sub-pulses to decreasae the grating lobes level. An example of comparison between this 3 basic signals autocrrelations R 1 (τ) and the resulting R(τ) near main lobe, is presented in Figure 5 LFM t b.b=12.5 Barker 13 Square pulse R 2 (τ/t b ) Grating lobes Fig. 6. Nullifying Grating lobes using state of the art method (LFM) R 1 (τ/tb ) 0.5 R(τ/tb ) τ/t b τ/t b Fig. 5. R 1 (τ) and resulting R(τ) according to the sub pulse nature (LFM, Barker 13, square pulse) at τ < t b The ambiguity functions of the previous signals are described in Figure 6 (LFM) and Figure 7 (Barker 13). We note that for square pulse, the correponding ambiguity function has been shown in Figure 4. We can see that the phase code Barker 13 can lower considerabely the Grating lobes. Furhermore, we can see that it allows better spreading of ambiguity function volume in time frequency plan, instead of concentrating it at near zero delay axis. A more general approach will be proposed in next section where several phase codes will be used, for several values of t b. f to discuss and validate the results. IV. PERFORMANCES ANALYSIS In this section we will analyse performances of the proposed approach using several phase codes in Costas sub pulses. The used configuration is: Costas array size M = 8, code=[2,6,3,8,7,5,1,4] product t b. f = 1, 5 and 10 phase codes binary phase code:barker 13 Polyphase codes: Qpsk Barker 16, Franck 16, Zadoff-chu 16 family codes : Golay family 8 8, Hadamard family 8 8 The Costas bit duration t b is subdivied in chips of duration t c where t b = L t c, L is code length to be implemented in the sub-pulse. Codes lengths used in our work are choosed to be aproximately at the same length while adapting to construction Fig. 7. Nullifying Grating lobes using phase code Barker 13 constaints ( Barker: L < 13, Franck L = k 2...). We propose a comparison in term of Peak Sidelobe Ratio (PSLR)of the zero doppler cut of the ambiguity function (absolute value of autoccrelation function), in near main lobe region (Table II) and outside the main lobe region (Table III) phase τ < t b codes t b. f = 1 t b. f = 5 t b. f = 10 Square pulse db -2 db -1.3 db Barker db -28 db QPSK Barker db db db Franck db db db P db db db Zadoff-chu db -19 db db Golay(8 8) db db db Balanced Hadamard(8 8) db db TABLE II PSLR COMPARISON NEAR MAINLOBE τ < t b

5 phase τ > t b codes t b. f = 1 t b. f = 5 t b. f = 10 Square pulse db db -38 db Barker db db db QPSK Barker db db db Franck db db db P db db db Zadoff-chu db db db Golay(8 8) db db db Balanced Hadamard(8 8) -15 db db db TABLE III PSLR COMPARISON IN τ > t b REGION From previous comparisons, we cans see that: Increasing the product t b. f increase grating lobes level and decrease the outisde lobes level. This is a result of constant volume of the ambiguity function so a reduce somewhere will cause an increase elsewhere. Phase coding Costas signal in case t b. f = 1 improve sidelobe level in near main lobe region and increase them elsewhere. Impact of phase coding in this case seems like a redistribution of Ambiguity function volume without much improvement, hence our interest in the phase encoding for t b. f > 1. for t b. f > 1, all phase codes allow considerable Grating lobes reducing below 19dB level. Barker codes(bpsk,qpsk) have approximately same performances. Here is the interest of using the polyphase version of Barker codes which is available for L > 13 unlike binary one. Chirplike codes (Franck, P4, Zadoff-chu) have approximately same perofmances as in LFM since they are derived phase history of discrete LFM. However, These codes tolerates some temporal sidelobes which leads to a considerable reduction of Doppler sidelobes and minimise the LFM effect that concentrate ambiguity function volume in near zero delay region causing high doppler sidelobes. Family of codes used in our work improves significantly the sidelobe level. Spectraly balanced Hadamard family codes acheive better perfoamnces than Golay family since these last have poorer correlation properties than the Hadamard family. This is explained by the fact that these codes have been optimized to have complemntary individual autoccrelations without imposing that each code of the family has good properties. eliminate grating lobes. Indeed, the more the product t b. f increases, the main lobe narrows (bandwidth increases), the number of grating lobes increases and became closer to the mainlobe. The autocrrelation of the used code must follow this fineness (increase the length of the code) to better eliminate the grating lobes. REFERENCES [1] N. Levanon and E. Mozeson, Radar signals. John Wiley and Sons, Inc, [2] J. Costas, A study of a class of detection waveforms having nearly ideal range ;doppler ambiguity properties, Proceedings of the IEEE, vol. 72, no. 8, pp , Aug. [3] N. Levanon and E. Mozeson, Modified costas signal, Aerospace and Electronic Systems, IEEE Transactions on, vol. 40, no. 3, pp , July. [4] Y. Hongbing, Z. Jianjiang, W. Fei, and Z. Zhenkai, Design and analysis of costas/psk rf stealth signal waveform, in Radar (Radar), 2011 IEEE CIE International Conference on, vol. 2, Oct., pp [5] P. Pace and C. Y. Ng, Costas cw frequency hopping radar waveform: peak sidelobe improvement using golay complementary sequences, Electronics Letters, vol. 46, no. 2, pp , 21. [6] J. Lemieux and F. Ingels, Analysis of fsk/psk modulated radar signals using costas arrays and complementary welti codes, in Radar Conference, 1990., Record of the IEEE 1990 International, May, pp [7] N. Levanon and E. Mozeson, Nullifying acf grating lobes in steppedfrequency train of lfm pulses, Aerospace and Electronic Systems, IEEE Transactions on, vol. 39, no. 2, pp , April. [8] I. Gladkova and D. Chebanov, Suppression of grating lobes in steppedfrequency train, in Radar Conference, 2005 IEEE International, May, pp [9] T. Chonavel, Orthogonal signals with jointly balanced spectra: Application to cdma transmissions, EURASIP Journal on Wireless Communications and Networking, V. CONCLUSION In this paper, it is shown that by combining Costats signals and PSK modulation, a significant reduction in sidelobe values will occur. Emphasis focused on grating lobes reduction in case of tb. > 1. It has been shown that using appropriate phase codes lower consderabely grating lobes and sidelobes in general. Moreover, using a family of codes to encode the Costas sub-pulses adds a randomness to the signal which results in a better distribution of the ambiguity function volume in addition to grating lobes supression. For more accuracy, it would better to study for each t b. f, the appropriate codes and the needed code length to best

DIVERSE RADAR PULSE-TRAIN WITH FAVOURABLE AUTOCORRELATION AND AMBIGUITY FUNCTIONS

DIVERSE RADAR PULSE-TRAIN WITH FAVOURABLE AUTOCORRELATION AND AMBIGUITY FUNCTIONS DIVERSE RADAR PULSE-TRAIN WITH FAVOURABLE AUTOCORRELATION AND AMBIGUITY FUNCTIONS E. Mozeson and N. Levanon Tel-Aviv University, Israel Abstract. A coherent train of identical Linear-FM pulses is a popular

More information

Implementing Orthogonal Binary Overlay on a Pulse Train using Frequency Modulation

Implementing Orthogonal Binary Overlay on a Pulse Train using Frequency Modulation Implementing Orthogonal Binary Overlay on a Pulse Train using Frequency Modulation As reported recently, overlaying orthogonal phase coding on any coherent train of identical radar pulses, removes most

More information

G.Raviprakash 1, Prashant Tripathi 2, B.Ravi 3. Page 835

G.Raviprakash 1, Prashant Tripathi 2, B.Ravi 3.   Page 835 International Journal of Scientific Engineering and Technology (ISS : 2277-1581) Volume o.2, Issue o.9, pp : 835-839 1 Sept. 2013 Generation of Low Probability of Intercept Signals G.Raviprakash 1, Prashant

More information

Pulse Compression Techniques for Target Detection

Pulse Compression Techniques for Target Detection Pulse Compression Techniques for Target Detection K.L.Priyanka Dept. of ECM, K.L.University Guntur, India Sujatha Ravichandran Sc-G, RCI, Hyderabad N.Venkatram HOD ECM, K.L.University, Guntur, India ABSTRACT

More information

Time and Frequency Domain Windowing of LFM Pulses Mark A. Richards

Time and Frequency Domain Windowing of LFM Pulses Mark A. Richards Time and Frequency Domain Mark A. Richards September 29, 26 1 Frequency Domain Windowing of LFM Waveforms in Fundamentals of Radar Signal Processing Section 4.7.1 of [1] discusses the reduction of time

More information

Non-coherent pulse compression - concept and waveforms Nadav Levanon and Uri Peer Tel Aviv University

Non-coherent pulse compression - concept and waveforms Nadav Levanon and Uri Peer Tel Aviv University Non-coherent pulse compression - concept and waveforms Nadav Levanon and Uri Peer Tel Aviv University nadav@eng.tau.ac.il Abstract - Non-coherent pulse compression (NCPC) was suggested recently []. It

More information

A New Sidelobe Reduction Technique For Range Resolution Radar

A New Sidelobe Reduction Technique For Range Resolution Radar Proceedings of the 7th WSEAS International Conference on Multimedia Systems & Signal Processing, Hangzhou, China, April 15-17, 007 15 A New Sidelobe Reduction Technique For Range Resolution Radar K.RAJA

More information

Phase Coded Radar Signals Frank Code & P4 Codes

Phase Coded Radar Signals Frank Code & P4 Codes ISSN: 2454-132X Impact factor: 4.295 (Volume 3, Issue 6) Available online at www.ijariit.com Phase Coded Radar Signals Frank Code & P4 Codes B. Shubhaker Assistant Professor Electronics and Communication

More information

f = 5 is equal to the delay resolution of a B =12. 5 is shown in Fig. 1. Using M 5

f = 5 is equal to the delay resolution of a B =12. 5 is shown in Fig. 1. Using M 5 Orthogonal rain of Modified Costas Pulses Nadav Levanon and Eli Mozeson Dept. of Electrical Engineering Systems, el Aviv University P.O. Box 394 el Aviv 6998 Israel Astract wo recent results are comined

More information

Non-Linear Frequency Modulated Nested Barker Codes for Increasing Range Resolution

Non-Linear Frequency Modulated Nested Barker Codes for Increasing Range Resolution Non-Linear Frequency Modulated Nested Barker Codes for Increasing Range Resolution K. Ravi Kumar 1, Prof.P. Rajesh Kumar 2 1 Research Scholar, Dept. of ECE, Andhra University, 2 Professor & Chairman, BOS,

More information

Pulse Compression. Since each part of the pulse has unique frequency, the returns can be completely separated.

Pulse Compression. Since each part of the pulse has unique frequency, the returns can be completely separated. Pulse Compression Pulse compression is a generic term that is used to describe a waveshaping process that is produced as a propagating waveform is modified by the electrical network properties of the transmission

More information

Low Power LFM Pulse Compression RADAR with Sidelobe suppression

Low Power LFM Pulse Compression RADAR with Sidelobe suppression Low Power LFM Pulse Compression RADAR with Sidelobe suppression M. Archana 1, M. Gnana priya 2 PG Student [DECS], Dept. of ECE, Gokula Krishna College of Engineering, Sullurpeta, Andhra Pradesh, India

More information

Reduction in sidelobe and SNR improves by using Digital Pulse Compression Technique

Reduction in sidelobe and SNR improves by using Digital Pulse Compression Technique Reduction in sidelobe and SNR improves by using Digital Pulse Compression Technique Devesh Tiwari 1, Dr. Sarita Singh Bhadauria 2 Department of Electronics Engineering, Madhav Institute of Technology and

More information

Analysis of LFM and NLFM Radar Waveforms and their Performance Analysis

Analysis of LFM and NLFM Radar Waveforms and their Performance Analysis Analysis of LFM and NLFM Radar Waveforms and their Performance Analysis Shruti Parwana 1, Dr. Sanjay Kumar 2 1 Post Graduate Student, Department of ECE,Thapar University Patiala, Punjab, India 2 Assistant

More information

Development of Efficient Radar Pulse Compression Technique for Frequency Modulated Pulses

Development of Efficient Radar Pulse Compression Technique for Frequency Modulated Pulses Development of Efficient Radar Pulse Compression Technique for Frequency Modulated Pulses Thesis submitted in partial fulfillment of the requirements for the degree of Master of Technology In Electronics

More information

Radar Signal Classification Based on Cascade of STFT, PCA and Naïve Bayes

Radar Signal Classification Based on Cascade of STFT, PCA and Naïve Bayes 216 7th International Conference on Intelligent Systems, Modelling and Simulation Radar Signal Classification Based on Cascade of STFT, PCA and Naïve Bayes Yuanyuan Guo Department of Electronic Engineering

More information

WLFM RADAR SIGNAL AMBIGUITY FUNCTION OPTIMALIZATION USING GENETIC ALGORITHM

WLFM RADAR SIGNAL AMBIGUITY FUNCTION OPTIMALIZATION USING GENETIC ALGORITHM WLFM RADAR SIGNAL AMBIGUITY FUNCTION OPTIMALIZATION USING GENETIC ALGORITHM Martin Bartoš Doctoral Degree Programme (1), FEEC BUT E-mail: xbarto85@stud.feec.vutbr.cz Supervised by: Jiří Šebesta E-mail:

More information

Study on Imaging Algorithm for Stepped-frequency Chirp Train waveform Wang Liang, Shang Chaoxuan, He Qiang, Han Zhuangzhi, Ren Hongwei

Study on Imaging Algorithm for Stepped-frequency Chirp Train waveform Wang Liang, Shang Chaoxuan, He Qiang, Han Zhuangzhi, Ren Hongwei Applied Mechanics and Materials Online: 3-8-8 ISSN: 66-748, Vols. 347-35, pp -5 doi:.48/www.scientific.net/amm.347-35. 3 Trans Tech Publications, Switzerland Study on Imaging Algorithm for Stepped-frequency

More information

SIDELOBES REDUCTION USING SIMPLE TWO AND TRI-STAGES NON LINEAR FREQUENCY MODULA- TION (NLFM)

SIDELOBES REDUCTION USING SIMPLE TWO AND TRI-STAGES NON LINEAR FREQUENCY MODULA- TION (NLFM) Progress In Electromagnetics Research, PIER 98, 33 52, 29 SIDELOBES REDUCTION USING SIMPLE TWO AND TRI-STAGES NON LINEAR FREQUENCY MODULA- TION (NLFM) Y. K. Chan, M. Y. Chua, and V. C. Koo Faculty of Engineering

More information

RADAR SIGNALS NADAV LEVANON ELI MOZESON

RADAR SIGNALS NADAV LEVANON ELI MOZESON RADAR SIGNALS NADAV LEVANON ELI MOZESON A JOHN WILEY & SONS, INC., PUBLICATION RADAR SIGNALS RADAR SIGNALS NADAV LEVANON ELI MOZESON A JOHN WILEY & SONS, INC., PUBLICATION Copyright 2004 by John Wiley

More information

The Metrication Waveforms

The Metrication Waveforms The Metrication of Low Probability of Intercept Waveforms C. Fancey Canadian Navy CFB Esquimalt Esquimalt, British Columbia, Canada cam_fancey@hotmail.com C.M. Alabaster Dept. Informatics & Sensor, Cranfield

More information

Modified Costas Signal

Modified Costas Signal I. INTRODUCTION Modified Costas Signal NADAV LEVANON, Fellow, IEEE ELI MOZESON Tel Aviv University Israel A modification to the Costas signal is suggested. It involves an increase of the frequency separation

More information

Implementation of Barker Code and Linear Frequency Modulation Pulse Compression Techniques in Matlab

Implementation of Barker Code and Linear Frequency Modulation Pulse Compression Techniques in Matlab Implementation of Barker Code and Linear Frequency Modulation Pulse Compression Techniques in Matlab C. S. Rawat 1, Deepak Balwani 2, Dipti Bedarkar 3, Jeetan Lotwani 4, Harpreet Kaur Saini 5 Associate

More information

Side-lobe Suppression Methods for Polyphase Codes

Side-lobe Suppression Methods for Polyphase Codes 211 3 rd International Conference on Signal Processing Systems (ICSPS 211) IPCSIT vol. 48 (212) (212) IACSIT Press, Singapore DOI: 1.7763/IPCSIT.212.V48.25 Side-lobe Suppression Methods for Polyphase Codes

More information

Monostatic Sonar Performance Using Pulse Compression Waveforms

Monostatic Sonar Performance Using Pulse Compression Waveforms Monostatic Sonar Performance Using Pulse Compression Waveforms Saima Ahmed, Hari Vishnu and Mandar Chitre Acoustic Research Laboratory, Tropical Marine Science Institute, National University of Singapore

More information

Comparative Analysis of Performance of Phase Coded Pulse Compression Techniques

Comparative Analysis of Performance of Phase Coded Pulse Compression Techniques International Journal of Latest Trends in Engineering and Technology Vol.(7)Issue(3), pp. 573-580 DOI: http://dx.doi.org/10.21172/1.73.577 e-issn:2278-621x Comparative Analysis of Performance of Phase

More information

Costas Arrays. James K Beard. What, Why, How, and When. By James K Beard, Ph.D.

Costas Arrays. James K Beard. What, Why, How, and When. By James K Beard, Ph.D. Costas Arrays What, Why, How, and When By, Ph.D. Tonight s Topics Definition of Costas arrays Significance of Costas arrays Methods to obtain Costas arrays Principal uses of Costas arrays Waveform example

More information

INTRODUCTION TO RADAR SIGNAL PROCESSING

INTRODUCTION TO RADAR SIGNAL PROCESSING INTRODUCTION TO RADAR SIGNAL PROCESSING Christos Ilioudis University of Strathclyde c.ilioudis@strath.ac.uk Overview History of Radar Basic Principles Principles of Measurements Coherent and Doppler Processing

More information

Simulation and Implementation of Pulse Compression Techniques using Ad6654 for Atmospheric Radar Applications

Simulation and Implementation of Pulse Compression Techniques using Ad6654 for Atmospheric Radar Applications Simulation and Implementation of Pulse Compression Techniques using Ad6654 for Atmospheric Radar Applications Shaik Benarjee 1, K.Prasanthi 2, Jeldi Kamal Kumar 3, M.Durga Rao 4 1 M.Tech (DECS), 2 Assistant

More information

On Integrated Radar and Communication Systems Using Oppermann Sequences

On Integrated Radar and Communication Systems Using Oppermann Sequences On Integrated Radar and Communication Systems Using Oppermann Sequences Momin Jamil, Hans-Jürgen Zepernick, and Mats I. Pettersson Blekinge Institute of echnology PO Box 2, SE-372 2 Ronneby, Sweden E-mail:

More information

Nonlinear FM Waveform Design to Reduction of sidelobe level in Autocorrelation Function

Nonlinear FM Waveform Design to Reduction of sidelobe level in Autocorrelation Function 017 5 th Iranian Conerence on Electrical (ICEE) Nonlinear FM Waveorm Design to Reduction o sidelobe level in Autocorrelation Function Roohollah Ghavamirad Department o Electrical K. N. Toosi University

More information

Waveform Diversity: Past, Present, and Future

Waveform Diversity: Past, Present, and Future A. De Maio (SIEEE), A. Farina (FREng, FIET,FIEEE) Abstract Waveform diversity indicates the ability to adapt and diversify dynamically the waveform to the operating environment in order to achieve a performance

More information

S PG Course in Radio Communications. Orthogonal Frequency Division Multiplexing Yu, Chia-Hao. Yu, Chia-Hao 7.2.

S PG Course in Radio Communications. Orthogonal Frequency Division Multiplexing Yu, Chia-Hao. Yu, Chia-Hao 7.2. S-72.4210 PG Course in Radio Communications Orthogonal Frequency Division Multiplexing Yu, Chia-Hao chyu@cc.hut.fi 7.2.2006 Outline OFDM History OFDM Applications OFDM Principles Spectral shaping Synchronization

More information

D1.26B VDES Training Sequence Performance Characteristics (v.1.2)

D1.26B VDES Training Sequence Performance Characteristics (v.1.2) D1.26B VDES Training Sequence Performance Characteristics (v.1.2) Dr Arunas Macikunas Waves in Space Corp., Canada Presented by Dr Jan Šafář General Lighthouse Authorities of the UK & Ireland IALA ENAV

More information

Analysis of low probability of intercept (LPI) radar signals using the Wigner Distribution

Analysis of low probability of intercept (LPI) radar signals using the Wigner Distribution Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection 2002-09 Analysis of low probability of intercept (LPI) radar signals using the Wigner Distribution Gau, Jen-Yu Monterey

More information

EVALUATION OF BINARY PHASE CODED PULSE COMPRESSION SCHEMES USING AND TIME-SERIES WEATHER RADAR SIMULATOR

EVALUATION OF BINARY PHASE CODED PULSE COMPRESSION SCHEMES USING AND TIME-SERIES WEATHER RADAR SIMULATOR 7.7 1 EVALUATION OF BINARY PHASE CODED PULSE COMPRESSION SCHEMES USING AND TIMESERIES WEATHER RADAR SIMULATOR T. A. Alberts 1,, P. B. Chilson 1, B. L. Cheong 1, R. D. Palmer 1, M. Xue 1,2 1 School of Meteorology,

More information

Optimising Sidelobes and Grating Lobes in Frequency Modulated Pulse Compression

Optimising Sidelobes and Grating Lobes in Frequency Modulated Pulse Compression Optimising Sidelobes and Grating Lobes in Frequency Modulated Pulse Compression Thesis submitted in partial fulfillment of the requirements for the degree of Master Of Technology In Electronics and Communication

More information

Radar Performance of Temporal and Frequency Diverse Phase-Coded Waveforms

Radar Performance of Temporal and Frequency Diverse Phase-Coded Waveforms 1 Radar Performance of Temporal and Frequency Diverse Phase-Coded Waveforms Sofia Suvorova, Bill Moran, Elena Kalashyan, Peter Zulch, Robert J. Hancock Prometheus Inc., 21 Arnold Ave, Newport, RI 02840,

More information

CHAPTER-1 INTRODUCTION. Radar is an integral part of any modern weapon systems. ability to work in all weather environments at long ranges is

CHAPTER-1 INTRODUCTION. Radar is an integral part of any modern weapon systems. ability to work in all weather environments at long ranges is CHAPTER-1 INTRODUCTION Radar is an integral part of any modern weapon systems. Its ability to work in all weather environments at long ranges is incomparable with any other existing sensors. Use of wideband

More information

A Stepped Frequency CW SAR for Lightweight UAV Operation

A Stepped Frequency CW SAR for Lightweight UAV Operation UNCLASSIFIED/UNLIMITED A Stepped Frequency CW SAR for Lightweight UAV Operation ABSTRACT Dr Keith Morrison Department of Aerospace, Power and Sensors University of Cranfield, Shrivenham Swindon, SN6 8LA

More information

Generation of New Complementary and Sub Complementary Pulse Compression Code Sequences

Generation of New Complementary and Sub Complementary Pulse Compression Code Sequences International Journal of Engineering esearch & Technology (IJET) Generation of New Complementary and Sub Complementary Pulse Compression Code Sequences Sk.Masthan vali #1,.Samuyelu #2, J.kiran chandrasekar

More information

SEVERAL types of code division multiple access (CDMA)

SEVERAL types of code division multiple access (CDMA) 918 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 47, NO. 6, JUNE 1999 Spreading Sequences for Multicarrier CDMA Systems Branislav M. Popović Abstract The paper contains an analysis of the basic criteria for

More information

4254 IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 54, NO. 9, SEPTEMBER /$ IEEE

4254 IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 54, NO. 9, SEPTEMBER /$ IEEE 4254 IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 54, NO. 9, SEPTEMBER 2008 Doppler Resilient Golay Complementary Waveforms Ali Pezeshki, Member, IEEE, A. Robert Calderbank, Fellow, IEEE, William Moran,

More information

Staggered PRI and Random Frequency Radar Waveform

Staggered PRI and Random Frequency Radar Waveform Tel Aviv University Raymond and Beverly Sackler Faculty of Exact Sciences Staggered PRI and Random Frequency Radar Waveform Submitted as part of the requirements towards an M.Sc. degree in Physics School

More information

Lecture 9: Spread Spectrum Modulation Techniques

Lecture 9: Spread Spectrum Modulation Techniques Lecture 9: Spread Spectrum Modulation Techniques Spread spectrum (SS) modulation techniques employ a transmission bandwidth which is several orders of magnitude greater than the minimum required bandwidth

More information

Incoherent Scatter Experiment Parameters

Incoherent Scatter Experiment Parameters Incoherent Scatter Experiment Parameters At a fundamental level, we must select Waveform type Inter-pulse period (IPP) or pulse repetition frequency (PRF) Our choices will be dictated by the desired measurement

More information

EC 6501 DIGITAL COMMUNICATION UNIT - IV PART A

EC 6501 DIGITAL COMMUNICATION UNIT - IV PART A EC 6501 DIGITAL COMMUNICATION UNIT - IV PART A 1. Distinguish coherent vs non coherent digital modulation techniques. [N/D-16] a. Coherent detection: In this method the local carrier generated at the receiver

More information

A Novel Approach for Designing Diversity Radar Waveforms that are Orthogonal on Both Transmit and Receive

A Novel Approach for Designing Diversity Radar Waveforms that are Orthogonal on Both Transmit and Receive A Novel Approach for Designing Diversity Radar Waveforms that are Orthogonal on Both ransmit and Receive Uttam K. Majumder, Mark R. Bell School of Electrical and Computer Engineering Purdue University,

More information

Automotive Radar Sensors and Congested Radio Spectrum: An Urban Electronic Battlefield?

Automotive Radar Sensors and Congested Radio Spectrum: An Urban Electronic Battlefield? Automotive Radar Sensors and Congested Radio Spectrum: An Urban Electronic Battlefield? By Sefa Tanis Share on As automotive radars become more widespread, the heavily occupied RF spectrum will resemble

More information

Design and Implementation of Signal Processor for High Altitude Pulse Compression Radar Altimeter

Design and Implementation of Signal Processor for High Altitude Pulse Compression Radar Altimeter 2012 4th International Conference on Signal Processing Systems (ICSPS 2012) IPCSIT vol. 58 (2012) (2012) IACSIT Press, Singapore DOI: 10.7763/IPCSIT.2012.V58.13 Design and Implementation of Signal Processor

More information

Multi-carrier Modulation and OFDM

Multi-carrier Modulation and OFDM 3/28/2 Multi-carrier Modulation and OFDM Prof. Luiz DaSilva dasilval@tcd.ie +353 896-366 Multi-carrier systems: basic idea Typical mobile radio channel is a fading channel that is flat or frequency selective

More information

HIGH RESOLUTION WEATHER RADAR THROUGH PULSE COMPRESSION

HIGH RESOLUTION WEATHER RADAR THROUGH PULSE COMPRESSION P1.15 1 HIGH RESOLUTION WEATHER RADAR THROUGH PULSE COMPRESSION T. A. Alberts 1,, P. B. Chilson 1, B. L. Cheong 1, R. D. Palmer 1, M. Xue 1,2 1 School of Meteorology, University of Oklahoma, Norman, Oklahoma,

More information

The Design and Detection of Signature Sequences in Time-Frequency Selective Channel

The Design and Detection of Signature Sequences in Time-Frequency Selective Channel The Design and Detection of Signature Sequences in Time-Frequency Selective Channel Jiann-Ching Guey Ericsson Research 81 Development Drive Research Triangle Park, North Carolina 2779, USA Email: jiann-ching.guey@ericsson.com

More information

Next Generation Synthetic Aperture Radar Imaging

Next Generation Synthetic Aperture Radar Imaging Next Generation Synthetic Aperture Radar Imaging Xiang-Gen Xia Department of Electrical and Computer Engineering University of Delaware Newark, DE 19716, USA Email: xxia@ee.udel.edu This is a joint work

More information

OFDM signal constellation processing on Radar applications. Kh. Tovmasyan

OFDM signal constellation processing on Radar applications. Kh. Tovmasyan Armenian Journal of Physics, 2013, vol. 6, issue 4, pp. 204-208 OFDM signal constellation processing on Radar applications Kh. Tovmasyan Institute of Radiophysics & Electronics of NAS of Armenia 1 Alikhanianbrs

More information

QUESTION BANK EC 1351 DIGITAL COMMUNICATION YEAR / SEM : III / VI UNIT I- PULSE MODULATION PART-A (2 Marks) 1. What is the purpose of sample and hold

QUESTION BANK EC 1351 DIGITAL COMMUNICATION YEAR / SEM : III / VI UNIT I- PULSE MODULATION PART-A (2 Marks) 1. What is the purpose of sample and hold QUESTION BANK EC 1351 DIGITAL COMMUNICATION YEAR / SEM : III / VI UNIT I- PULSE MODULATION PART-A (2 Marks) 1. What is the purpose of sample and hold circuit 2. What is the difference between natural sampling

More information

ADAPTIVITY IN MC-CDMA SYSTEMS

ADAPTIVITY IN MC-CDMA SYSTEMS ADAPTIVITY IN MC-CDMA SYSTEMS Ivan Cosovic German Aerospace Center (DLR), Inst. of Communications and Navigation Oberpfaffenhofen, 82234 Wessling, Germany ivan.cosovic@dlr.de Stefan Kaiser DoCoMo Communications

More information

Implementation of OFDM Modulated Digital Communication Using Software Defined Radio Unit For Radar Applications

Implementation of OFDM Modulated Digital Communication Using Software Defined Radio Unit For Radar Applications Volume 118 No. 18 2018, 4009-4018 ISSN: 1311-8080 (printed version); ISSN: 1314-3395 (on-line version) url: http://www.ijpam.eu ijpam.eu Implementation of OFDM Modulated Digital Communication Using Software

More information

Discrete Frequency and Phase Coding Waveform for MIMO Radar

Discrete Frequency and Phase Coding Waveform for MIMO Radar RADIOENGINEERING, VOL. 26, NO. 3, SEPTEMBER 2017 835 Discrete Frequency and Phase Coding Waveform for MIMO Radar Guanghong CHANG 1, Xiaoxi YU 2, Changjun YU 3 1 School of Electronics and Information Engineering,

More information

(xix) SYNOPSIS. Copyright

(xix) SYNOPSIS. Copyright (xix) SYNOPSIS Among the various techniques employed for communication in the presence of noise and interference, the idea of using a common channel with large time-bandwidth (TB) product has been successfully

More information

A Soft-Limiting Receiver Structure for Time-Hopping UWB in Multiple Access Interference

A Soft-Limiting Receiver Structure for Time-Hopping UWB in Multiple Access Interference 2006 IEEE Ninth International Symposium on Spread Spectrum Techniques and Applications A Soft-Limiting Receiver Structure for Time-Hopping UWB in Multiple Access Interference Norman C. Beaulieu, Fellow,

More information

NAVAL POSTGRADUATE SCHOOL THESIS

NAVAL POSTGRADUATE SCHOOL THESIS NAVAL POSTGRADUATE SCHOOL MONTEREY, CALIFORNIA THESIS COMPARISON OF COMPLEMENTARY SEQUENCES IN HYBRID PHASE AND FREQUENCY SHIFT KEYING CW RADAR USING PERIODIC AMBIGUITY ANALYSIS by Francisco José Castañeda

More information

Study on the Characteristics of LFM Signals, BC Signals and Their Mixed Modulation Signals

Study on the Characteristics of LFM Signals, BC Signals and Their Mixed Modulation Signals Int. J. Communications, Network and System Sciences, 7,, 96-5 http://www.scirp.org/journal/ijcns ISSN Online: 93-373 ISSN Print: 93-375 Study on the Characteristics of Signals, Signals and Their Mixed

More information

Modern radio techniques

Modern radio techniques Modern radio techniques for probing the ionosphere Receiver, radar, advanced ionospheric sounder, and related techniques Cesidio Bianchi INGV - Roma Italy Ionospheric properties related to radio waves

More information

CDMA Technology : Pr. S. Flament Pr. Dr. W. Skupin On line Course on CDMA Technology

CDMA Technology : Pr. S. Flament  Pr. Dr. W. Skupin  On line Course on CDMA Technology CDMA Technology : Pr. Dr. W. Skupin www.htwg-konstanz.de Pr. S. Flament www.greyc.fr/user/99 On line Course on CDMA Technology CDMA Technology : Introduction to Spread Spectrum Technology CDMA / DS : Principle

More information

SPREAD SPECTRUM (SS) SIGNALS FOR DIGITAL COMMUNICATIONS

SPREAD SPECTRUM (SS) SIGNALS FOR DIGITAL COMMUNICATIONS Dr. Ali Muqaibel SPREAD SPECTRUM (SS) SIGNALS FOR DIGITAL COMMUNICATIONS VERSION 1.1 Dr. Ali Hussein Muqaibel 1 Introduction Narrow band signal (data) In Spread Spectrum, the bandwidth W is much greater

More information

WAVEFORM USE IN INCOHERENT RADAR AND LASER RADAR APPLICATIONS

WAVEFORM USE IN INCOHERENT RADAR AND LASER RADAR APPLICATIONS WAVEFORM USE IN INCOHERENT RADAR AND LASER RADAR APPLICATIONS Reinhard Erdmann, John Malowicki, Michael Fanto, Thomas McEwen Air Force Research Laboratory Sensors Directorate, Rome NY Henry Zmuda University

More information

Robust Optimal and Adaptive Pulse Compression for FM Waveforms. Dakota Henke

Robust Optimal and Adaptive Pulse Compression for FM Waveforms. Dakota Henke Robust Optimal and Adaptive Pulse Compression for FM Waveforms By Dakota Henke Submitted to the Department of Electrical Engineering and Computer Science and the Graduate Faculty of the University of Kansas

More information

Radar Waveform Design For High Resolution Doppler Target Detection

Radar Waveform Design For High Resolution Doppler Target Detection IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735.Volume 9, Issue 6, Ver. IV (Nov - Dec. 214), PP 1-9 Radar Waveform Design For High Resolution

More information

An Improved VLSI Architecture Using Galois Sequence for High Speed DSSS Signal Acquisition at Low SNR

An Improved VLSI Architecture Using Galois Sequence for High Speed DSSS Signal Acquisition at Low SNR International Journal of Engineering Inventions ISSN: 2278-7461, www.ijeijournal.com Volume 1, Issue 9 (November2012) PP: 42-48 An Improved VLSI Architecture Using Galois Sequence for High Speed DSSS Signal

More information

Multiple Target Detection for HRR Signal Design

Multiple Target Detection for HRR Signal Design Multiple Target Detection for HRR Signal Design Mohd. Moazzam Moinuddin 1, Mallikarjuna Reddy. Y. 2, Pasha. I. A 3, Lal Kishore. K 4. 1 Associate Professor, Dept. of ECE, Noor College of Engineering &

More information

High Resolution Low Power Nonlinear Chirp Radar Pulse Compression using FPGA Y. VIDYULLATHA

High Resolution Low Power Nonlinear Chirp Radar Pulse Compression using FPGA Y. VIDYULLATHA www.semargroup.org, www.ijsetr.com ISSN 2319-8885 Vol.03,Issue.26 September-2014, Pages:5242-5248 High Resolution Low Power Nonlinear Chirp Radar Pulse Compression using FPGA Y. VIDYULLATHA 1 PG Scholar,

More information

Research Article Noise Radar Technology as an Interference Prevention Method

Research Article Noise Radar Technology as an Interference Prevention Method Electrical and Computer Engineering Volume 213, Article ID 146986, 6 pages http://dx.doi.org/1.1155/213/146986 Research Article Noise Radar Technology as an Interference Prevention Method Gaspare Galati

More information

Chapter 2 Direct-Sequence Systems

Chapter 2 Direct-Sequence Systems Chapter 2 Direct-Sequence Systems A spread-spectrum signal is one with an extra modulation that expands the signal bandwidth greatly beyond what is required by the underlying coded-data modulation. Spread-spectrum

More information

Sets of Waveform and Mismatched Filter Pairs for Clutter Suppression in Marine Radar Application

Sets of Waveform and Mismatched Filter Pairs for Clutter Suppression in Marine Radar Application http://www.transnav.eu the International Journal on Marine Navigation and afety of ea Transportation Volume 11 Number 3 eptember 17 DOI: 1.1716/11.11.3.17 ets of aveform and Mismatched Filter Pairs for

More information

UWB Hardware Issues, Trends, Challenges, and Successes

UWB Hardware Issues, Trends, Challenges, and Successes UWB Hardware Issues, Trends, Challenges, and Successes Larry Larson larson@ece.ucsd.edu Center for Wireless Communications 1 UWB Motivation Ultra-Wideband Large bandwidth (3.1GHz-1.6GHz) Power spectrum

More information

Photonic Signal Processing(PSP) of Microwave Signals

Photonic Signal Processing(PSP) of Microwave Signals Photonic Signal Processing(PSP) of Microwave Signals 2015.05.08 김창훈 R. A. Minasian, Photonic signal processing of microwave signals, IEEE Trans. Microw. Theory Tech., vol. 54, no. 2, pp. 832 846, Feb.

More information

Implementation of Orthogonal Frequency Coded SAW Devices Using Apodized Reflectors

Implementation of Orthogonal Frequency Coded SAW Devices Using Apodized Reflectors Implementation of Orthogonal Frequency Coded SAW Devices Using Apodized Reflectors Derek Puccio, Don Malocha, Nancy Saldanha Department of Electrical and Computer Engineering University of Central Florida

More information

Lecture 2. Mobile Evolution Introduction to Spread Spectrum Systems. COMM 907:Spread Spectrum Communications

Lecture 2. Mobile Evolution Introduction to Spread Spectrum Systems. COMM 907:Spread Spectrum Communications COMM 907: Spread Spectrum Communications Lecture 2 Mobile Evolution Introduction to Spread Spectrum Systems Evolution of Mobile Telecommunications Evolution of Mobile Telecommunications Evolution of Mobile

More information

Sidelobe Reduction using Frequency Modulated Pulse Compression Techniques in Radar

Sidelobe Reduction using Frequency Modulated Pulse Compression Techniques in Radar International Journal of Latest Trends in Engineering and Technology Vol.(7)Issue(3), pp. 171 179 DOI: http://dx.doi.org/10.21172/1.73.524 e ISSN:2278 621X Sidelobe Reduction using Frequency Modulated

More information

Proceedings of the 5th WSEAS Int. Conf. on SIGNAL, SPEECH and IMAGE PROCESSING, Corfu, Greece, August 17-19, 2005 (pp17-21)

Proceedings of the 5th WSEAS Int. Conf. on SIGNAL, SPEECH and IMAGE PROCESSING, Corfu, Greece, August 17-19, 2005 (pp17-21) Ambiguity Function Computation Using Over-Sampled DFT Filter Banks ENNETH P. BENTZ The Aerospace Corporation 5049 Conference Center Dr. Chantilly, VA, USA 90245-469 Abstract: - This paper will demonstrate

More information

Space-Time Adaptive Processing Using Sparse Arrays

Space-Time Adaptive Processing Using Sparse Arrays Space-Time Adaptive Processing Using Sparse Arrays Michael Zatman 11 th Annual ASAP Workshop March 11 th -14 th 2003 This work was sponsored by the DARPA under Air Force Contract F19628-00-C-0002. Opinions,

More information

QUESTION BANK SUBJECT: DIGITAL COMMUNICATION (15EC61)

QUESTION BANK SUBJECT: DIGITAL COMMUNICATION (15EC61) QUESTION BANK SUBJECT: DIGITAL COMMUNICATION (15EC61) Module 1 1. Explain Digital communication system with a neat block diagram. 2. What are the differences between digital and analog communication systems?

More information

Noncoherent Pulse Compression I. INTRODUCTION

Noncoherent Pulse Compression I. INTRODUCTION [9] Jekeli, C. Inertial Navigation Systems with Geodetic Applications. Berlin: Walter de Gruyter, 2000. [10] Julier, S. J., Uhlmann, J. K., and Durrant-Whyte, H. F. A new method for the nonlinear transformation

More information

Physical Layer: Modulation, FEC. Wireless Networks: Guevara Noubir. S2001, COM3525 Wireless Networks Lecture 3, 1

Physical Layer: Modulation, FEC. Wireless Networks: Guevara Noubir. S2001, COM3525 Wireless Networks Lecture 3, 1 Wireless Networks: Physical Layer: Modulation, FEC Guevara Noubir Noubir@ccsneuedu S, COM355 Wireless Networks Lecture 3, Lecture focus Modulation techniques Bit Error Rate Reducing the BER Forward Error

More information

A Research Concept on Bit Rate Detection using Carrier offset through Analysis of MC-CDMA SYSTEM

A Research Concept on Bit Rate Detection using Carrier offset through Analysis of MC-CDMA SYSTEM Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology ISSN 2320 088X IMPACT FACTOR: 5.258 IJCSMC,

More information

Analyzing Pulse Position Modulation Time Hopping UWB in IEEE UWB Channel

Analyzing Pulse Position Modulation Time Hopping UWB in IEEE UWB Channel Analyzing Pulse Position Modulation Time Hopping UWB in IEEE UWB Channel Vikas Goyal 1, B.S. Dhaliwal 2 1 Dept. of Electronics & Communication Engineering, Guru Kashi University, Talwandi Sabo, Bathinda,

More information

Computational Complexity of Multiuser. Receivers in DS-CDMA Systems. Syed Rizvi. Department of Electrical & Computer Engineering

Computational Complexity of Multiuser. Receivers in DS-CDMA Systems. Syed Rizvi. Department of Electrical & Computer Engineering Computational Complexity of Multiuser Receivers in DS-CDMA Systems Digital Signal Processing (DSP)-I Fall 2004 By Syed Rizvi Department of Electrical & Computer Engineering Old Dominion University Outline

More information

NAVAL POSTGRADUATE SCHOOL THESIS

NAVAL POSTGRADUATE SCHOOL THESIS NAVAL POSTGRADUATE SCHOOL MONTEREY, CALIFORNIA THESIS RANGE SIDELOBE RESPONSE FROM THE USE OF POLYPHASE SIGNALS IN SPOTLIGHT SYNTHETIC APERTURE RADAR by Danny M. Lang December 2015 Thesis Advisor: Co-Advisor:

More information

COMPARATIVE ANALYSIS OF PEAK CORRELATION CHARACTERISTICS OF NON-ORTHOGONAL SPREADING CODES FOR WIRELESS SYSTEMS

COMPARATIVE ANALYSIS OF PEAK CORRELATION CHARACTERISTICS OF NON-ORTHOGONAL SPREADING CODES FOR WIRELESS SYSTEMS International Journal of Distributed and Parallel Systems (IJDPS) Vol.3, No.3, May 212 COMPARATIVE ANALYSIS OF PEAK CORRELATION CHARACTERISTICS OF NON-ORTHOGONAL SPREADING CODES FOR WIRELESS SYSTEMS Dr.

More information

Power limits fulfilment and MUI reduction based on pulse shaping in UWB networks

Power limits fulfilment and MUI reduction based on pulse shaping in UWB networks Power limits fulfilment and MUI reduction based on pulse shaping in UWB networks Luca De Nardis, Guerino Giancola, Maria-Gabriella Di Benedetto Università degli Studi di Roma La Sapienza Infocom Dept.

More information

Ambiguity Function Analysis of SFCW and Comparison of Impulse GPR and SFCW GPR

Ambiguity Function Analysis of SFCW and Comparison of Impulse GPR and SFCW GPR Ambiguity Function Analysis of SFCW and Comparison of Impulse GPR and SFCW GPR Shrikant Sharma, Paramananda Jena, Ramchandra Kuloor Electronics and Radar Development Establishment (LRDE), Defence Research

More information

Wireless Medium Access Control and CDMA-based Communication Lesson 08 Auto-correlation and Barker Codes

Wireless Medium Access Control and CDMA-based Communication Lesson 08 Auto-correlation and Barker Codes Wireless Medium Access Control and CDMA-based Communication Lesson 08 Auto-correlation and Barker Codes 1 Coding Methods in CDMA Use distinctive spreading codes to spread the symbols before transmission

More information

Cross-correlation of long binary signals with longer mismatched filters

Cross-correlation of long binary signals with longer mismatched filters Cross-correlation of long binary signals with longer mismatched filters N. Levanon Abstract: Mismatched processing of long binary signals is revisited. The filter is optimised for minimum integrated or

More information

Wideband Channel Characterization. Spring 2017 ELE 492 FUNDAMENTALS OF WIRELESS COMMUNICATIONS 1

Wideband Channel Characterization. Spring 2017 ELE 492 FUNDAMENTALS OF WIRELESS COMMUNICATIONS 1 Wideband Channel Characterization Spring 2017 ELE 492 FUNDAMENTALS OF WIRELESS COMMUNICATIONS 1 Wideband Systems - ISI Previous chapter considered CW (carrier-only) or narrow-band signals which do NOT

More information

Copyright Warning & Restrictions

Copyright Warning & Restrictions Copyright Warning & Restrictions The copyright law of the United States (Title 17, United States Code) governs the making of photocopies or other reproductions of copyrighted material. Under certain conditions

More information

Interference of Chirp Sequence Radars by OFDM Radars at 77 GHz

Interference of Chirp Sequence Radars by OFDM Radars at 77 GHz Interference of Chirp Sequence Radars by OFDM Radars at 77 GHz Christina Knill, Jonathan Bechter, and Christian Waldschmidt 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must

More information

Simulation of Optical CDMA using OOC Code

Simulation of Optical CDMA using OOC Code International Journal of Scientific and Research Publications, Volume 2, Issue 5, May 22 ISSN 225-353 Simulation of Optical CDMA using OOC Code Mrs. Anita Borude, Prof. Shobha Krishnan Department of Electronics

More information

A Multicarrier CDMA Based Low Probability of Intercept Network

A Multicarrier CDMA Based Low Probability of Intercept Network A Multicarrier CDMA Based Low Probability of Intercept Network Sayan Ghosal Email: sayanghosal@yahoo.co.uk Devendra Jalihal Email: dj@ee.iitm.ac.in Giridhar K. Email: giri@ee.iitm.ac.in Abstract The need

More information

AN FPGA IMPLEMENTATION OF ALAMOUTI S TRANSMIT DIVERSITY TECHNIQUE

AN FPGA IMPLEMENTATION OF ALAMOUTI S TRANSMIT DIVERSITY TECHNIQUE AN FPGA IMPLEMENTATION OF ALAMOUTI S TRANSMIT DIVERSITY TECHNIQUE Chris Dick Xilinx, Inc. 2100 Logic Dr. San Jose, CA 95124 Patrick Murphy, J. Patrick Frantz Rice University - ECE Dept. 6100 Main St. -

More information