# Clipping and Filtering Technique for reducing PAPR In OFDM

Size: px
Start display at page:

Transcription

2 II. SINGLE-CARRIER TRANSMISSION In Fig1, there is a block diagram for a typical end-to-end single-carrier scheme. This transmission system is contains of a band-limited channel denoted by t, the transmit mapper g T t, the receiver demapper g R t and equalizer symbolized by 1 t. The transmitted symbols a n have a period of T for each symbol and the data rate is presented as R = 1/T. The output of the process is shown in the following equations (1) and (2) where the AWGN is denoted by z (t): y t = m = a m g t mt + z t (1) g t = g T t t g R t 1 t (2) We made assumption in this paper that the transmitted signal is recovered from the fading and noise effects using the equalizer. Since this assumption is made, the noise in the previous equations is ignored and the noise-free output can be formed as follow: y t = m = a m g (n m)t (3) Fig1: Model of single-carrier transmission system. In the stages of mapping and de-mapping, different modulation techniques could be used. Quadrature Amplitude Modulation (QAM) and Phase Shift Keying (PSK) are used in this paper as a modulation technique. The input sinusoidal signal can be mapped to two components the In-phase component I t and the Quadrature component Q t. To explain the concept of modulation procedure, we can take Binary PSK as an example. In the case of having BPSK, there are two possible values, 0 or 1. While, if QPSK is used, we would have two binary digits at a time, (00,01,10,11). Table1 show the mapped component represented in terms of Q and I: Table 1: Converting binary digits to complex form. Binary Digits I(t) Q(t) 00 1/ 2 1/ / 2 1/ / 2 1/ / 2 1/ 2 III. MULTI-CARRIER (OFDM) To over come the shortages that appear using single-carrier transmission, OFDM is used as a multicarrier transmission [4]. Fig2 shows a block diagram for the OFDM transmission system where it has two main parts: transmitting side and receiving side. The signal gets into the transmitting side starting with mapping process. Then the output of the operation is converted from serial form to parallel form making shorter symbols sequences. A pilot is inserted in between the sub-carrier seeking a way to estimate a start of the OFDM symbols. Afterward the output signal goes through the IFFT operation before adding the Cyclic Prefix (CP). The use of the IFFT is so important to overcome the use of huge number of RF oscillators. The last stage in the receiver is the parallel to serial convertor. Fig2: Model of Multi-carrier transmission system (OFDM). 92 P a g e

3 Orthogonality should be achieved to ensure better spectral efficiency for the system and maximum capacity for the transmitting channels. The aim of maintaining orthogonality is to prevent the overlapped of center frequency for the subcarrier and giving a chance for the spectrums of the subcarriers to overlap desiring higher spectral efficiency. Assume there is complex exponential signal {e j 2πfkt N 1 } k=0 that represents the subcarriers in the OFDM signal while we have f k = k/. To check the orthogonality of any two sub-carriers in the OFDM signal, the following conditions can be applied as shown in equation (4): 1 e j 2πf k t e j 2πfit dt = j 2πk etsym t j 2πi e Tsym t dt = 1 0 e j 2π (k i) Tsym t dt (4) = 1, wen k = i 0, oterwise If the dot product of the tested signals is not equal zero, we can say that these two signals did not fulfill the orthogonality condition, otherwise the two signals are orthogonal to each other. To prevent ISI, guard intervals are used to be inserted between the OFDM symbols to avoid the overlapping that could be caused by transmitting delay. The used of guard intervals is so important to ensure a symbol full attenuating. There are several types of guard intervals: zero padding, cyclic prefix (CP) and cyclic suffix (CS). In this paper we inserted CP as guard intervals to prevent ISI. On the receiving side, the signal is down converted to get the baseband signal and we make assumption that both side of the system, the receiver and the transmitter, are synchronize in time. After that, the received signal is converted from serial to parallel form to have shorter sequence in length. Then the CP is removed from the signal preparing it to proceed through the FFT operation. In the ideal case, we would have perfect output, which is impossible in practical operations. IV. PEAK-TO-AVERAGE POWER RATIO (PAPR) Depends on the ratio between the maximum power of the complex pass-band signal and the mean power of it, we can calculate the PAPR. The value of PAPR can be calculated as following equation shows [7]: PAPR = max (x 2 t ) mean (x 2 t ) (5) Where x t is presented in the equation to denote the amplitude of the complex pass-band signal. To calculate the probability of having PAPR greater than the threshold value for the OFDM signal, we could use Complementary Cumulative Distribution Function (CCDF). By simulating the CCDF, we compare the theoretical values with the simulation results and the PAPR keeps increasing when the number of carriers increases. In the simulation part there is a figure showing the CCDFs of OFDM signals with different number of subcarriers. Fig3: Input and output characteristic of an HPA [5]. If we use linear amplifiers that they have larger input than the nominal value, we could have an output with a nonlinear distortion. In Fig3, there is a diagram for High Power Amplifier (HPA) showing the input and output characteristic. In this diagram, the input power is denoted by P in while the outputs power is represented max by P out. To keep the linearity, the maximum output power is limited by the value P out and the maximum input power is pounded by P max in. Both the input and output power are backed off to insure a linear operation and the area of the backing off is termed by Input Bach-Off (IBO) and Output Back-Off (OBO). The following two 93 P a g e

4 equations describe the IBO and the OBO in terms of the input-output power and the maximum input-output power: IBO = 10 log 10 P in max P in (6) P max IBO = 10 log out 10 (7) P out In the case of having nonlinear HPA characteristic, which is caused by having larger input than its nominal value, we could have out-of-band radiation that makes an overlap between the adjacent signals [8]. Also there is another problem that appears with the nonlinear characteristic of HPA that is the in-band distortion causing a serious issues including attenuation, spinning and offset the received signals. V. CLIPPING AND FILTERING The clipping is the easiest technique to reduce the power by setting a maximum level for the transmitted signal [9]. Though, this technique has several disadvantages: The performance of BER could be affected negatively due to the in-band distortion caused by the clipping. Also out-of-band radiation usually appears with clipping technique that could disturb the adjacent channels. However, we can use filtering operation to decrease the appearance of the out-of-band radiation but the signal may exceed the maximum level of the clipping operation [10]. The block diagram of clipping and filtering technique for PAPR reduction is exposed in Fig4. In this figure, N denotes the number of subcarrier and L represents the oversampling factor. In the diagram, The IFFT generate x [m] which is the L-times oversampled signal. As shown in fig4, the FFT-IFFT filter is applied to allow the signal passing through a band-pass filter (BPF) then through a low-pass filter (LPF). The outcome of the filtering stage is a less degraded BER performance and a reduced out-of-band radiation. Though, the PAPR reductions improvements are gained at the cost of regrowth the peak where the signal could go beyond the clipping level after applying the filtering operation. L.N point IFFT f c Digital Up Conv Clipping and Filtering L.N point FFT LPF L.N point IFFT BPF Fig4: The scheme of clipping and filtering technique for PAPR. The signal x p [m] is the passband modulated one with carrier frequency f c. We symbolize the clipped form of the passband-modulated signal as x c p [m]. The expression of this signal is shown in following equation: x c p m = A x p m A x p m A x p [m] < A x p m A (8) Where the clipping level is denoted by A and (CR) is the clipping ratio that can be represented as follow: CR = A (9) σ Where the RMS value of OFDM signal is denoted by σ and it is well known that σ = N for the baseband and σ = N/2 for the passband OFDM signal. 94 P a g e

5 VI. SIMULATION RESULTS The BER performance is investigated in this comparison using MATLAB code. The definition of the BER can be explained as the effected bits divided by the whole number of the transmitted bits over a time interval [11]. This calculation provides us with a percentage quantity that is a unit-less. In Fig5, there is two curves represent a comparison between the OFDM and the SC transmission systems. The comparison shows the BER performance when we use 4QAM. From the curves we can see that the OFDM transmission system improves the BER percentage compared to the SC. As we stated before, the use of the OFDM transmission has a main drawback, which is the PAPR distribution as shown in Fig6. Fig5: BER curves for OFDM Vs. SC using 4QAM. Fig6: CCDFs of OFDM Vs. SC using 4QAM. Because crest factor (CF) is the square root of PAPR, CCDF of the CF represents the PAPR distribution. Fig7 shows CCDFs of CF of the OFDM signals after clipping with three different values for clipping ratio. There is an obvious drop in the PAPR of the OFDM signal after clipping. It can be seen as well that the highest PAPR reduction effects happens at the lowest clipping ratio. Fig7 shows that the PAPR is 14.3dB for the unclipped signal at CCDF of When we apply a clipping ratio (CR) of 1, PAPR is reduced to 5.2dB after applying this algorithm for the same values of CCDF. On the other hand, the BER performance is worsen badly as shown in Fig8 at it gets better when the CR get higher. 95 P a g e

6 Fig7: PAPR distribution for clipped and unclipped signals. Fig8: BER for clipped and unclipped signals. Fig9 shows the effect of the clipping and filtering on the PAPR performance where the PAPR is reduce clearly after applying this power reduction technique. The performance of BER for the clipping and filtering technique with respect to the signal to noise ratio (SNR) is compared to the unclipped OFDM signal BER as shown in fig10. Different clipping ratios have been used. It is clear that the performance of the BER get worse as the CR gets lower. The BER of the clipped and filtered signal is at 10 db SNR when the clipping ratio is 1.2. The curves also show that the BER of the clipped signal is for the same clipping ratio and SNR. Fig9: PAPR distribution for clipped, filtered, and unclipped signals. 96 P a g e

7 Fig10: BER for clipped, filtered, and unclipped signals. VII. CONCLUSION In this paper, the BER performance is investigated and analyzed for the OFDM and the sing-carrier transmitting schemes to compare between them. For the both techniques, the same parameters are used to make a reasonable comparison and the two signals went through the same channel (AWGN). From the results, we have noticed that the BER performance is improved using the OFDM and outperforms the single-carrier performance. Though, there is a major drawback for using OFDM, which is the high PAPR. This problem can be reduced by using clipping and filtering, as a power reduction technique. The performance of clipping and filtering technique to has been studied in this paper. We conclude from our results that PAPR reduces more at lower CR. The results show how clipping and filtering affect the BER of an OFDM signal and it is clear that the BER is increased after this process. Filter is used to decrease the distortion that result from clipping. REFRENCES [1] A. John, Multicarrier Modulation for Data Transmission : An Idea Whose Time Has Come. IEEE Communications Magazine, [2] S. Albdran, A. Alshammari, and M. Matin, The Sensitivity of Bit Error Rate (BER) Performance in Multi-Carrier (OFDM) and Single-Carrier, SPIE optics and photonics, [3] J. Tubbax, OFDM versus Single Carrier: A Realistic Multi- Antenna Comparison, EURASIP Journal on Applied Signal Processing, 2004, [4] R. Nee, and R. Prasad, OFDM for wireless multimedia communications, Boston, MA: Artech House, [5] Y. Cho, J. Kim, W. Yang, and C. Kang, MIMO-OFDM wireless communication with MATLAB (Singapore, Wiley, 2010) [6] A. Bahai, B. Saltzberg, and M. Ergen, Multi carrier digital communications: Theory and applications of OFDM, Springer Science, New York, [7] A. Saleh, R. Valenzuela, A Statistical Model for Indoor Multipath Propagation, IEEE Journal on selected Areas in Communications, 1987, [8] H. Ochiai, and H. Imai, On the Distribution of the Peak to Average Power Ratio in OFDM Signals, IEEE Trans. Commun, [9] S. Han, and J. Lee, An overview of peak-to-average power ratio reduction techniques for multicarrier transmission, IEEE Wireless Communications, 2005, [10] B. Alhasson, and M. Matin, Reduction of PAPR for OFDM Downlink and IFDMA Uplink Wireless Transmissions, International Journal of Computer Science and Information Security, [11] A. Alshammari, S. Albdran, M.Matin, Study of Bit Error Rate (BER) for Multicarrier OFDM, SPIE optics and photonic, P a g e

### Effects of Fading Channels on OFDM

IOSR Journal of Engineering (IOSRJEN) e-issn: 2250-3021, p-issn: 2278-8719, Volume 2, Issue 9 (September 2012), PP 116-121 Effects of Fading Channels on OFDM Ahmed Alshammari, Saleh Albdran, and Dr. Mohammad

### PAPR Reduction techniques in OFDM System Using Clipping & Filtering and Selective Mapping Methods

PAPR Reduction techniques in OFDM System Using Clipping & Filtering and Selective Mapping Methods Okello Kenneth 1, Professor Usha Neelakanta 2 1 P.G. Student, Department of Electronics & Telecommunication

### 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,

### Evaluation of BER and PAPR by using Different Modulation Schemes in OFDM System

International Journal of Computer Networks and Communications Security VOL. 3, NO. 7, JULY 2015, 277 282 Available online at: www.ijcncs.org E-ISSN 2308-9830 (Online) / ISSN 2410-0595 (Print) Evaluation

### Decrease Interference Using Adaptive Modulation and Coding

International Journal of Computer Networks and Communications Security VOL. 3, NO. 9, SEPTEMBER 2015, 378 383 Available online at: www.ijcncs.org E-ISSN 2308-9830 (Online) / ISSN 2410-0595 (Print) Decrease

### Simulative Investigations for Robust Frequency Estimation Technique in OFDM System

, pp. 187-192 http://dx.doi.org/10.14257/ijfgcn.2015.8.4.18 Simulative Investigations for Robust Frequency Estimation Technique in OFDM System Kussum Bhagat 1 and Jyoteesh Malhotra 2 1 ECE Department,

### A Comparative Approach between Clipping and Probabilistic Technique for Reducing PAPR of OFDM System

Advance in Electronic and Electric Engineering. ISSN 2231-1297, Volume 3, Number 7 (2013), pp. 779-788 Research India Publications http://www.ripublication.com/aeee.htm A Comparative Approach between Clipping

### Comparative Study of OFDM & MC-CDMA in WiMAX System

IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735.Volume 9, Issue 1, Ver. IV (Jan. 2014), PP 64-68 Comparative Study of OFDM & MC-CDMA in WiMAX

### IJMIE Volume 2, Issue 4 ISSN:

Reducing PAPR using PTS Technique having standard array in OFDM Deepak Verma* Vijay Kumar Anand* Ashok Kumar* Abstract: Orthogonal frequency division multiplexing is an attractive technique for modern

### A Comparative performance analysis of CFO Estimation in OFDM Systems for Urban, Rural and Rayleigh area using CP and Moose Technique

International Journal of Current Engineering and Technology E-ISSN 2277 4106, P-ISSN 2347 5161 2015 INPRESSCO, All Rights Reserved Available at http://inpressco.com/category/ijcet Research Article A Comparative

### Optimal Number of Pilots for OFDM Systems

IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735.Volume 8, Issue 6 (Nov. - Dec. 2013), PP 25-31 Optimal Number of Pilots for OFDM Systems Onésimo

### Interleaved PC-OFDM to reduce the peak-to-average power ratio

1 Interleaved PC-OFDM to reduce the peak-to-average power ratio A D S Jayalath and C Tellambura School of Computer Science and Software Engineering Monash University, Clayton, VIC, 3800 e-mail:jayalath@cssemonasheduau

### Keywords: MC-CDMA, PAPR, Partial Transmit Sequence, Complementary Cumulative Distribution Function.

ol. 2, Issue4, July-August 2012, pp.1192-1196 PAPR Reduction of an MC-CDMA System through PTS Technique using Suboptimal Combination Algorithm Gagandeep Kaur 1, Rajbir Kaur 2 Student 1, University College

### Outline / Wireless Networks and Applications Lecture 7: Physical Layer OFDM. Frequency-Selective Radio Channel. How Do We Increase Rates?

Page 1 Outline 18-452/18-750 Wireless Networks and Applications Lecture 7: Physical Layer OFDM Peter Steenkiste Carnegie Mellon University RF introduction Modulation and multiplexing Channel capacity Antennas

### BER ANALYSIS OF BPSK, QPSK & QAM BASED OFDM SYSTEM USING SIMULINK

BER ANALYSIS OF BPSK, QPSK & QAM BASED OFDM SYSTEM USING SIMULINK Pratima Manhas 1, Dr M.K Soni 2 1 Research Scholar, FET, ECE, 2 ED& Dean, FET, Manav Rachna International University, Fbd (India) ABSTRACT

### PERFORMANCE ANALYSIS OF PARTIAL RANSMIT SEQUENCE USING FOR PAPR REDUCTION IN OFDM SYSTEMS

PERFORMANCE ANALYSIS OF PARTIAL RANSMIT SEQUENCE USING FOR PAPR REDUCTION IN OFDM SYSTEMS *A.Subaitha Jannath, **C.Amarsingh Feroz *PG Scholar, Department of Electronics and Communication Engineering,

### Performance Evaluation of OFDM System with Rayleigh, Rician and AWGN Channels

Performance Evaluation of OFDM System with Rayleigh, Rician and AWGN Channels Abstract A Orthogonal Frequency Division Multiplexing (OFDM) scheme offers high spectral efficiency and better resistance to

### REDUCING PAPR OF OFDM BASED WIRELESS SYSTEMS USING COMPANDING WITH CONVOLUTIONAL CODES

REDUCING PAPR OF OFDM BASED WIRELESS SYSTEMS USING COMPANDING WITH CONVOLUTIONAL CODES Pawan Sharma 1 and Seema Verma 2 1 Department of Electronics and Communication Engineering, Bhagwan Parshuram Institute

### Analysis of Interference & BER with Simulation Concept for MC-CDMA

IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735.Volume 9, Issue 4, Ver. IV (Jul - Aug. 2014), PP 46-51 Analysis of Interference & BER with Simulation

### Algorithm to Improve the Performance of OFDM based WLAN Systems

International Journal of Computer Science & Communication Vol. 1, No. 2, July-December 2010, pp. 27-31 Algorithm to Improve the Performance of OFDM based WLAN Systems D. Sreenivasa Rao 1, M. Kanti Kiran

### BER Analysis for MC-CDMA

BER Analysis for MC-CDMA Nisha Yadav 1, Vikash Yadav 2 1,2 Institute of Technology and Sciences (Bhiwani), Haryana, India Abstract: As demand for higher data rates is continuously rising, there is always

### Lecture 13. Introduction to OFDM

Lecture 13 Introduction to OFDM Ref: About-OFDM.pdf Orthogonal frequency division multiplexing (OFDM) is well-known to be effective against multipath distortion. It is a multicarrier communication scheme,

### Iterative Clipping and Filtering Technique for PAPR Reduction in OFDM System without Encoding

International Journal of Latest Trends in Engineering and Technology Vol.(7)Issue(3), pp. 141-147 DOI: http://dx.doi.org/10.21172/1.73.519 e-issn:2278-621x Iterative Clipping and Filtering Technique for

### Implementation and Comparative analysis of Orthogonal Frequency Division Multiplexing (OFDM) Signaling Rashmi Choudhary

Implementation and Comparative analysis of Orthogonal Frequency Division Multiplexing (OFDM) Signaling Rashmi Choudhary M.Tech Scholar, ECE Department,SKIT, Jaipur, Abstract Orthogonal Frequency Division

### Orthogonal Frequency Division Multiplexing (OFDM) based Uplink Multiple Access Method over AWGN and Fading Channels

Orthogonal Frequency Division Multiplexing (OFDM) based Uplink Multiple Access Method over AWGN and Fading Channels Prashanth G S 1 1Department of ECE, JNNCE, Shivamogga ---------------------------------------------------------------------***----------------------------------------------------------------------

### Riemann Sequence based SLM with nonlinear effects of HPA

IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-issn: 2278-1676,p-ISSN: 2320-3331, Volume 10, Issue 6 Ver. I (Nov Dec. 2015), PP 74-80 www.iosrjournals.org Riemann Sequence based SLM

### OFDM Systems and PAPR Reduction Along With Channel Estimation

IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735.Volume 11, Issue 2, Ver. II (Mar-Apr.2016), PP 04-09 www.iosrjournals.org OFDM Systems and PAPR

### INTERFERENCE SELF CANCELLATION IN SC-FDMA SYSTEMS -A CAMPARATIVE STUDY

INTERFERENCE SELF CANCELLATION IN SC-FDMA SYSTEMS -A CAMPARATIVE STUDY Ms Risona.v 1, Dr. Malini Suvarna 2 1 M.Tech Student, Department of Electronics and Communication Engineering, Mangalore Institute

### Techniques for Mitigating the Effect of Carrier Frequency Offset in OFDM

IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735.Volume 10, Issue 3, Ver. III (May - Jun.2015), PP 31-37 www.iosrjournals.org Techniques for Mitigating

### MC CDMA PAPR Reduction Using Discrete Logarithmic Method

International Journal of Engineering Research and Development ISSN: 2278-067X, Volume 1, Issue 4 (June 2012), PP.38-43 www.ijerd.com MC CDMA PAPR Reduction Using Discrete Logarithmic Method B.Sarala 1,

### Performance Evaluation of Wireless Communication System Employing DWT-OFDM using Simulink Model

Performance Evaluation of Wireless Communication System Employing DWT-OFDM using Simulink Model M. Prem Anand 1 Rudrashish Roy 2 1 Assistant Professor 2 M.E Student 1,2 Department of Electronics & Communication

### PAPR Reduction in an OFDM system using Recursive Clipping and Filtering Technique

PAPR Reduction in an OFDM system using Recursive Clipping and Filtering Technique Md. ANAMUL ISLAM 1, N. AHMED 2*, NIZAM UDDIN AHAMED 3, MATIUR RAHMAN 4 S. A. Aljunid 2 1 Dept. of Applied Physics and Electronic

### II. OFDM SYSTEM MODEL

ISSN: 2321-7782 (Online) Impact Factor: 6.047 Volume 4, Issue, September 2016 International Journal of Advance Research in Computer Science and Management Studies Research Article / Survey Paper / Case

### Orthogonal frequency division multiplexing (OFDM)

Orthogonal frequency division multiplexing (OFDM) OFDM was introduced in 1950 but was only completed in 1960 s Originally grew from Multi-Carrier Modulation used in High Frequency military radio. Patent

### PEAK TO AVERAGE POWER RATIO REDUCTION USING BANDWIDTH EFFICIENCY INCREASING METHOD IN OFDM SYSTEM

www.arpapress.com/volumes/vol6issue/ijrras_6.pdf PEAK TO AVERAGE POWER RATIO REDUCTIO USIG BADWIDTH EFFICIECY ICREASIG METHOD I OFDM SYSTEM A.A. Abdul Wahab and M. F. Ain School of Electrical and Electronic

### Performance Evaluation of PAPR Reduction with SER and BER by Modified Clipping & Filtering in 3GPP LTE Downlink

ISSN (Online): 2409-4285 www.ijcsse.org Page: 14-22 Performance Evaluation of PAPR Reduction with SER and BER by Modified Clipping & Filtering in 3GPP LTE Downlink M. Y. Arafat 1, S. Abd. Latif 2, M. K.

### A New PAPR Reduction in OFDM Systems Using SLM and Orthogonal Eigenvector Matrix

A New PAPR Reduction in OFDM Systems Using SLM and Orthogonal Eigenvector Matrix Md. Mahmudul Hasan University of Information Technology & Sciences, Dhaka Abstract OFDM is an attractive modulation technique

### USE OF CLIPPING AND LINEAR PHASE FIR FILTERING TO REDUCE PAPR IN OFDM SYSTEM

USE OF CLIPPING AND LINEAR PHASE FIR FILTERING TO REDUCE PAPR IN OFDM SYSTEM Pradeep K G M 1 and K.Dasharath 2 1,2 Department of ECE, Sphoorthy Engineering College Abstract- Orthogonal frequency division

### CHAPTER 3 ADAPTIVE MODULATION TECHNIQUE WITH CFO CORRECTION FOR OFDM SYSTEMS

44 CHAPTER 3 ADAPTIVE MODULATION TECHNIQUE WITH CFO CORRECTION FOR OFDM SYSTEMS 3.1 INTRODUCTION A unique feature of the OFDM communication scheme is that, due to the IFFT at the transmitter and the FFT

### Hybrid PTS-Clipping Scheme for PAPR Reduction in MIMO-OFDM Systems

Hybrid PTS-Clipping Scheme for PAPR Reduction in MIMO-OFDM Systems Beena A O 1, Sakuntala S Pillai 2, N. Vijayakumar 3 1 Department of Electronics & Communication Engineering, SAINTGITS College of Engineering,

### ECE5984 Orthogonal Frequency Division Multiplexing and Related Technologies Fall Mohamed Essam Khedr. Fading Channels

ECE5984 Orthogonal Frequency Division Multiplexing and Related Technologies Fall 2007 Mohamed Essam Khedr Fading Channels Major Learning Objectives Upon successful completion of the course the student

### PERFORMANCE IMPROVEMENT FOR PAPR REDUCTION IN LTE DOWNLINK SYSTEM WITH ELLIPTIC FILTERING

PERFORMANCE IMPROVEMENT FOR PAPR REDUCTION IN LTE DOWNLINK SYSTEM WITH ELLIPTIC FILTERING Snikdho Sworov Haque 1, Md. Munjure Mowla 2 1,2 Department of Electronics and Telecommunication Engineering, Rajshahi

### Peak-to-Average Power Ratio (PAPR)

Peak-to-Average Power Ratio (PAPR) Wireless Information Transmission System Lab Institute of Communications Engineering National Sun Yat-sen University 2011/07/30 王森弘 Multi-carrier systems The complex

### UNIFIED DIGITAL AUDIO AND DIGITAL VIDEO BROADCASTING SYSTEM USING ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) SYSTEM

UNIFIED DIGITAL AUDIO AND DIGITAL VIDEO BROADCASTING SYSTEM USING ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) SYSTEM 1 Drakshayini M N, 2 Dr. Arun Vikas Singh 1 drakshayini@tjohngroup.com, 2 arunsingh@tjohngroup.com

### Performance Study of OFDM over Multipath Fading Channels for Next Wireless Communications

International Journal of Applied Engineering Research ISS 973-456 Volume, umber (7) pp. 5- Performance Study of OFDM over Multipath Fading Channels for ext Wireless Communications Kommabatla Mahender Research

### International Journal of Informative & Futuristic Research ISSN:

Reviewed Paper Volume 3 Issue 7 March 2016 International Journal of Informative & Futuristic Research Study Of Bit Error Rate Performance And CFO Estimation In OFDM Using QPSK Modulation Technique Paper

### Low Complexity Partial SLM Technique for PAPR Reduction in OFDM Transmitters

International Journal on Electrical Engineering and Informatics - Volume 5, Number 1, March 2013 Low Complexity Partial SLM Technique for PAPR Reduction in OFDM Transmitters Ibrahim Mohammad Hussain Department

### Lecture 3: Wireless Physical Layer: Modulation Techniques. Mythili Vutukuru CS 653 Spring 2014 Jan 13, Monday

Lecture 3: Wireless Physical Layer: Modulation Techniques Mythili Vutukuru CS 653 Spring 2014 Jan 13, Monday Modulation We saw a simple example of amplitude modulation in the last lecture Modulation how

### Nonlinear Companding Transform Algorithm for Suppression of PAPR in OFDM Systems

Nonlinear Companding Transform Algorithm for Suppression of PAPR in OFDM Systems P. Guru Vamsikrishna Reddy 1, Dr. C. Subhas 2 1 Student, Department of ECE, Sree Vidyanikethan Engineering College, Andhra

### Channel Estimation in Multipath fading Environment using Combined Equalizer and Diversity Techniques

International Journal of Scientific & Engineering Research Volume3, Issue 1, January 2012 1 Channel Estimation in Multipath fading Environment using Combined Equalizer and Diversity Techniques Deepmala

### THE COMBINATION OF CLIPPING AND FILTERING WITH SELECTIVE MAPPING METHODS FOR PEAK TO AVERAGE POWER RATIO REDUCTION IN OFDM

24 Acta Electrotechnica et Informatica, Vol. 9, No. 4, 2009, 24 29 THE COMBINATION OF CLIPPING AND FILTERING WITH SELECTIVE MAPPING METHODS FOR PEAK TO AVERAGE POWER RATIO REDUCTION IN OFDM Josef URBAN,

### COMPARISON OF SLM & PTS TECHNIQUES FOR REDUCING PAPR IN OFDM

COMPARISON OF SLM & PTS TECHNIQUES FOR REDUCING PAPR IN OFDM Bala Bhagya Sree.Ch 1, Aruna Kumari.S 2 1 Department of ECE, Mallareddy college of Engineering& Technology, Hyderabad, India 2 Associate Professor

### University of Bristol - Explore Bristol Research. Link to publication record in Explore Bristol Research PDF-document.

Mansor, Z. B., Nix, A. R., & McGeehan, J. P. (2011). PAPR reduction for single carrier FDMA LTE systems using frequency domain spectral shaping. In Proceedings of the 12th Annual Postgraduate Symposium

### MODIFIED SELECTED MAPPING TECHNIQUE TO REDUCE PEAK TO AVERAGE POWER RATIO FOR OFDM SIGNALS

MODIFIED SELECTED MAPPING TECHNIQUE TO REDUCE PEAK TO AVERAGE POWER RATIO FOR OFDM SIGNALS Tanvir Ahmed, Foisal Ahmed, Sifat Hossain Department of Electrical & Electronic Engineering Islamic University

### BER ANALYSIS OF WiMAX IN MULTIPATH FADING CHANNELS

BER ANALYSIS OF WiMAX IN MULTIPATH FADING CHANNELS Navgeet Singh 1, Amita Soni 2 1 P.G. Scholar, Department of Electronics and Electrical Engineering, PEC University of Technology, Chandigarh, India 2

### OFDM Systems For Different Modulation Technique

Computing For Nation Development, February 08 09, 2008 Bharati Vidyapeeth s Institute of Computer Applications and Management, New Delhi OFDM Systems For Different Modulation Technique Mrs. Pranita N.

### Performance analysis of FFT based and Wavelet Based SC-FDMA in Lte

Performance analysis of FFT based and Wavelet Based SC-FDMA in Lte Shanklesh M. Vishwakarma 1, Prof. Tushar Uplanchiwar 2,Prof.MissRohiniPochhi Dept of ECE,Tgpcet,Nagpur Abstract Single Carrier Frequency

### International Journal of Engineering, Business and Enterprise Applications (IJEBEA)

International Association of Scientific Innovation and Research (IASIR) (An Association Unifying the Sciences, Engineering, and Applied Research) ISSN (Print): 2279-0020 ISSN (Online): 2279-0039 V International

### Frequency Offset Compensation In OFDM System Using Neural Network

Frequency Offset Compensation In OFDM System Using Neural Network Rachana P. Borghate 1, Suvarna K. Gosavi 2 Lecturer, Dept. of ETRX, Rajiv Gandhi college of Engg, Nagpur, Maharashtra, India 1 Lecturer,

### Performance Analysis of OFDM System with QPSK for Wireless Communication

IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735.Volume 11, Issue 3, Ver. I (May-Jun.2016), PP 33-37 www.iosrjournals.org Performance Analysis

### Chapter 0 Outline. NCCU Wireless Comm. Lab

Chapter 0 Outline Chapter 1 1 Introduction to Orthogonal Frequency Division Multiplexing (OFDM) Technique 1.1 The History of OFDM 1.2 OFDM and Multicarrier Transmission 1.3 The Applications of OFDM 2 Chapter

### Part 3. Multiple Access Methods. p. 1 ELEC6040 Mobile Radio Communications, Dept. of E.E.E., HKU

Part 3. Multiple Access Methods p. 1 ELEC6040 Mobile Radio Communications, Dept. of E.E.E., HKU Review of Multiple Access Methods Aim of multiple access To simultaneously support communications between

### An Improved SLM Technique Using Discrete Cosine Transform in OFDM. S. Lih., An Improved SLM Technique Using Discrete Cosine Transform in OFDM System.

AUSTRALIAN JOURNAL OF BASIC AND APPLIED SCIENCES ISSN:1991-8178 EISSN: 2309-8414 Journal home page: www.ajbasweb.com An Improved SLM Technique Using Discrete Cosine Transform in OFDM System A. A. A. Wahab

### Performance of OFDM-Based WiMAX System Using Cyclic Prefix

ICoSE Conference on Instrumentation, Environment and Renewable Energy (2015), Volume 2016 Conference Paper Performance of OFDM-Based WiMAX System Using Cyclic Prefix Benriwati Maharmi Electrical Engineering

### OFDM AS AN ACCESS TECHNIQUE FOR NEXT GENERATION NETWORK

OFDM AS AN ACCESS TECHNIQUE FOR NEXT GENERATION NETWORK Akshita Abrol Department of Electronics & Communication, GCET, Jammu, J&K, India ABSTRACT With the rapid growth of digital wireless communication

### Performance Evaluation of STBC-OFDM System for Wireless Communication

Performance Evaluation of STBC-OFDM System for Wireless Communication Apeksha Deshmukh, Prof. Dr. M. D. Kokate Department of E&TC, K.K.W.I.E.R. College, Nasik, apeksha19may@gmail.com Abstract In this paper

### Comparison of ML and SC for ICI reduction in OFDM system

Comparison of and for ICI reduction in OFDM system Mohammed hussein khaleel 1, neelesh agrawal 2 1 M.tech Student ECE department, Sam Higginbottom Institute of Agriculture, Technology and Science, Al-Mamon

### Comparative Study on DWT-OFDM and FFT- OFDM Simulation Using Matlab Simulink

Comparative Study on DWT-OFDM and FFT- OFDM Simulation Using Matlab Simulink Manjunatha K #1, Mrs. Reshma M *2 #1 M.Tech Student, Dept of DECS, Visvedvaraya Institute of Advanced Technology (VIAT), Muddenahalli

### PAPR Reduction for Improved Efficiency of OFDM Modulation for Next Generation Communication Systems

International Journal of Electrical and Computer Engineering (IJECE) Vol. 6, No. 5, October 2016, pp. 2310~2321 ISSN: 2088-8708, DOI: 10.11591/ijece.v6i5.10878 2310 PAPR Reduction for Improved Efficiency

### Evaluation of Optimized PAPR and BER of OFDM signal by using Clipping and Filtering Technique

Mousumi De et al, / (IJCSIT) International Journal of Computer Science and Information Technologies, Vol. 5 (), 4, 6-65 Evaluation of Optimized PAPR and BER of OFDM signal by using Clipping and Filtering

### Optical Wireless Communication System with PAPR Reduction

IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 78-834,p- ISSN: 78-8735. PP 01-05 www.iosrjournals.org Optical Wireless Communication System with PAPR Reduction Minu Theresa

### Single Carrier Ofdm Immune to Intercarrier Interference

International Journal of Engineering Research and Development e-issn: 2278-067X, p-issn: 2278-800X, www.ijerd.com Volume 10, Issue 3 (March 2014), PP.42-47 Single Carrier Ofdm Immune to Intercarrier Interference

### Performance analysis of OFDM with QPSK using AWGN and Rayleigh Fading Channel

Performance analysis of OFDM with QPSK using AWGN and Rayleigh Fading Channel 1 V.R.Prakash* (A.P) Department of ECE Hindustan university Chennai 2 P.Kumaraguru**(A.P) Department of ECE Hindustan university

### PAPR Reduction in 4G Cellular Network: A SLM-based IFDMA Uplink System

Proceedings of the Pakistan Academy of Sciences 49 (2): 79-84 (2012) Copyright Pakistan Academy of Sciences ISSN: 0377-2969 Pakistan Academy of Sciences Original Article PAPR Reduction in 4G Cellular Network:

### DESIGN, IMPLEMENTATION AND OPTIMISATION OF 4X4 MIMO-OFDM TRANSMITTER FOR

DESIGN, IMPLEMENTATION AND OPTIMISATION OF 4X4 MIMO-OFDM TRANSMITTER FOR COMMUNICATION SYSTEMS Abstract M. Chethan Kumar, *Sanket Dessai Department of Computer Engineering, M.S. Ramaiah School of Advanced

### Simplified Levenberg-Marquardt Algorithm based PAPR Reduction for OFDM System with Neural Network

Simplified Levenberg-Marquardt Algorithm based PAPR Reduction for OFDM System with Neural Network Rahul V R M Tech Communication Department of Electronics and Communication BCCaarmel Engineering College,

### Low Complexity PAPR Reduction Technique for Coded OFDM Systems with Scrambling Approach

Research Article International Journal of Current Engineering and Technology ISSN 77-4106 014 INPRESSCO. All Rights Reserved. Available at http://inpressco.com/category/ijcet Low Complexity PAPR Reduction

### Reduction of peak to average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) system

Quest Journals Journal of Electronics and Communication Engineering Research Volume 2 ~ Issue 3 (2014) pp: 01-06 ISSN(Online) : 2321-5941 www.questjournals.org Research Paper Reduction of peak to average

### Performance Study of OFDM Over Fading Channels for Wireless Communications

University of Denver Digital Commons @ DU Electronic Theses and Dissertations Graduate Studies 1-1-2012 Performance Study of OFDM Over Fading Channels for Wireless Communications Ahmed Alshammari University

### Low Complexity PAPR Reduction Technique for Coded OFDM Systems with Scrambling Approach

Research Article International Journal of Current Engineering and Technology ISSN 77-4106 014 INPRESSCO. All Rights Reserved. Available at http://inpressco.com/category/ijcet Low Complexity PAPR Reduction

### Performance Study of MIMO-OFDM System in Rayleigh Fading Channel with QO-STB Coding Technique

e-issn 2455 1392 Volume 2 Issue 6, June 2016 pp. 190 197 Scientific Journal Impact Factor : 3.468 http://www.ijcter.com Performance Study of MIMO-OFDM System in Rayleigh Fading Channel with QO-STB Coding

### An Overview of PAPR Reduction Techniques in OFDM Systems

An Overview of PAPR Reduction Techniques in OFDM Systems Md. Mahmudul Hasan Electronics and Communication Engineering UITS, Dhaka-1212, Bangladesh S. S. Singh, PhD. School of Electronics Engineering KIIT

### 4x4 Time-Domain MIMO encoder with OFDM Scheme in WIMAX Context

4x4 Time-Domain MIMO encoder with OFDM Scheme in WIMAX Context Mohamed.Messaoudi 1, Majdi.Benzarti 2, Salem.Hasnaoui 3 Al-Manar University, SYSCOM Laboratory / ENIT, Tunisia 1 messaoudi.jmohamed@gmail.com,

### Effects of Nonlinearity on DFT-OFDM and DWT-OFDM Systems

Effects of Nonlinearity on DFT-OFDM and DWT-OFDM Systems Sivakrishna jajula 1, P.V.Ramana 2 1 Department of Electronics and Communication Engineering, Sree Vidyanikethan Engineering College, TIRUPATI 517

### Orthogonal Frequency Division Multiplexing & Measurement of its Performance

Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology IJCSMC, Vol. 5, Issue. 2, February 2016,

### INTERNATIONAL JOURNAL OF PURE AND APPLIED RESEARCH IN ENGINEERING AND TECHNOLOGY

INTERNATIONAL JOURNAL OF PURE AND APPLIED RESEARCH IN ENGINEERING AND TECHNOLOGY A PATH FOR HORIZING YOUR INNOVATIVE WORK HYBRID TECHNIQUE FOR PAPR REDUCTION IN OFDM USING PARTIAL TRANSMIT SEQUENCES MS.

### Performance Assessment of Orthogonal Frequency Division Multiplexing (OFDM) in Wireless Communication System

Performance Assessment of Orthogonal Frequency Division Multiplexing (OFDM) in Wireless Communication System Nubailah binti Arshad and Nurul Asyikin Mohamed Radzi College of Graduate Studies, Universiti

### ISSN: ISO 9001:2008 Certified International Journal of Engineering and Innovative Technology (IJEIT) Volume 4, Issue 6, December 2014

ISS: 2277-3754 International Journal of Engineering and Innovative Technology (IJEIT Reduction using Spread Technique for onlinear Communication Systems Shatrughna Prasad Yadav, Subhash Chandra Bera Electrical

### Optimization of PAPR Using HPA and Amplitude Clipping Reduction Technique

Optimization of PAPR Using HPA and Amplitude Clipping Reduction Technique Ritesh Baranwal Faculty, Dept. of E.I. ENGG.,VBS Purvanchal University, Jaunpur, India ABSTRACT: In modern age, the service users

### ELT Receiver Architectures and Signal Processing Fall Mandatory homework exercises

ELT-44006 Receiver Architectures and Signal Processing Fall 2014 1 Mandatory homework exercises - Individual solutions to be returned to Markku Renfors by email or in paper format. - Solutions are expected

### CHAPTER 1 INTRODUCTION

CHAPTER 1 INTRODUCTION High data-rate is desirable in many recent wireless multimedia applications [1]. Traditional single carrier modulation techniques can achieve only limited data rates due to the restrictions

### Computational Complexity Reduction of OFDM Signals by PTS with Various PAPR Conventional Methods

ISSN (O): 2349-7084 International Journal of Computer Engineering In Research Trends Computational Complexity Reduction of OFDM Signals by PTS with Various PAPR Conventional Methods BANOTHU RAMESH (1),

### Global Journal of Engineering Science and Research Management

MULTI CARRIER CODE DIVISION MULTIPLE ACCESS (MC-CDMA) IS TECHNOLOGY FOR FAR-FLUNG INTERNET Vemulapalli Venkataramana*, VaddeArunaRai * Department of Computer Engineering, Eritrea Institute of Technology,

OFDM Transciever for Nonlinear Communication Systems 1 Shatrughna Prasad Yadav, 2 Subhash Chandra Bera 1 EEE Department, Indus University, Ahmedabad 2 Satcom & Navigation Systems Eng. Division, SAC, ISRO,

SPREADING SEQUENCES SELECTION FOR UPLINK AND DOWNLINK MC-CDMA SYSTEMS S. NOBILET, J-F. HELARD, D. MOTTIER INSA/ LCST avenue des Buttes de Coësmes, RENNES FRANCE Mitsubishi Electric ITE 8 avenue des Buttes

### PIECEWISE LINEAR ITERATIVE COMPANDING TRANSFORM FOR PAPR REDUCTION IN MIMO OFDM SYSTEMS

PIECEWISE LINEAR ITERATIVE COMPANDING TRANSFORM FOR PAPR REDUCTION IN MIMO OFDM SYSTEMS T. Ramaswamy 1 and K. Chennakesava Reddy 2 1 Department of Electronics and Communication Engineering, Malla Reddy

Receiver Designs for the Radio Channel COS 463: Wireless Networks Lecture 15 Kyle Jamieson [Parts adapted from C. Sodini, W. Ozan, J. Tan] Today 1. Delay Spread and Frequency-Selective Fading 2. Time-Domain

### [Gupta, 3(3): March, 2014] ISSN: Impact Factor: 1.852

[Gupta, 3(3): March, 204] ISSN: 2277-9655 Impact Factor:.852 IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY Peak to Average Power Reduction using Radix-2 Decimation in Frequency