ORTHOGONAL frequency division multiplexing (OFDM)

Size: px
Start display at page:

Download "ORTHOGONAL frequency division multiplexing (OFDM)"

Transcription

1 144 IEEE TRANSACTIONS ON BROADCASTING, VOL. 51, NO. 1, MARCH 2005 Performance Analysis for OFDM-CDMA With Joint Frequency-Time Spreading Kan Zheng, Student Member, IEEE, Guoyan Zeng, and Wenbo Wang, Member, IEEE Abstract In this paper, a novel OFDM-CDMA system with joint time-frequency spreading methods is proposed. The average bit error probability of the proposed system using maximum-ratio combining (MRC) is derived for a frequency-selective fading channel and that of conventional MC-CDMA is also presented for comparison. Numerical analysis and simulation results indicate that the proposed system outperforms MC-CDMA system. Index Terms CDMA, maximum ratio combining, multiple access, OFDM. I. INTRODUCTION ORTHOGONAL frequency division multiplexing (OFDM) as a modulation technique is being applied extensively to high-speed wireless communication systems, such as digital audio broadcasting, digital TV broadcasting, and wireless LANs due to its efficient usage of the available frequency bandwidth and robustness to frequency selective fading environments [1] [3]. However, it has the limitation of spectral efficiency. With the rapid development of digital audio/video broadcasting, the availability of spectrum becomes one of the most serious problems when more applications are implemented. Meanwhile, code division multiple access (CDMA) has already shown quite a bit of promise in its spectral efficiency through the flexible frequency reuse and multiple access technique. So OFDM combined with code division multiple access (CDMA) has drawn a lot of interests in the research of new broadcasting schemes [4] [6]. The use of OFDM-CDMA provides a way to develop a new digital broadcasting scheme in areas with very limited spectral resource, where each user can be distinguished by its unique orthogonal code upon uplink transmission. OFDM-CDMA also can solve the power limitation problem in the uplink better than other schemes for broadcasting systems. Various OFDM-CDMA schemes have been proposed and can be mainly categorized into two groups according to code spreading direction [7] [10]. One is to spread the original data stream in the frequency domain; and the other is spread in the time domain, similar to a normal DS-CDMA scheme. Therefore, the frequency Rake receiver or time Rake receiver will be used, respectively. The former scheme, which is usually referred to as MC-CDMA, can obtain a good frequency Rake diversity effect through the despreading operation since the fading of each sub-carrier is different. Although the orthogonality will be degraded due to the frequency selective channel, a proper combining scheme can be selected to minimize such Manuscript received January 5, 2004; revised July 27, This work was supported by the Motorola Co. Ltd. (U.K.). The authors are with School of Telecommunication Engineering, Beijing University of Posts & Telecommunications, Beijing , China, ( zkan@buptnet.edu.cn). Digital Object Identifier /TBC effect and improve the system performance. However, such scheme can t achieve the time diversity gain by itself. The latter scheme, which is usually called as MC-DS-CDMA, is a good scheme to introduce the OFDM technology into DS-CDMA systems, especially for the quasisynchronous mobile communication environment. However, the frequency diversity gain, which is the main advantage of using such technique, can t be achieved if good channel coding and interleaving in the frequency domain are not combined. In this paper, we will propose a novel joint time-frequency 2-dimensional (2D) spreading method in OFDM-CDMA systems, which can offer not only time diversity but also frequency diversity at the receiver efficiently. In time-frequency selective fading channel, the performance of the proposed system will be better than that of MC-CDMA systems, which is referenced as 1D spreading system for comparison. This paper is organized as follows. Section II gives the brief description of the OFDM-CDMA system with joint time-frequency spreading. Performance analysis for MRC receiver is carried out in Section III. Numerical and simulation results are presented and discussed in Section IV. Finally, Section V gives the conclusion. II. SYSTEM MODEL A synchronous 2D OFDM-CDMA with simultaneous users is considered. The original information bit stream of user, is modulated (e.g., BPSK) at first. As required in the joint time-frequency spreading method, modulated symbols are grouped together and one frame consists of OFDM symbols. represents the bandwidth expansion factor due to spreading. The spreading at the transmitter and the despreading at the receiver are all processed frame by frame. Fig. 1 describes the implementation of the th user s time-frequency spreading grid pattern when the number of available sub-carriers is equal to the length of orthogonal codes, where the horizontal axis represents time and vertical axis frequency. As shown in Fig. 1, when one group of symbols for the th frame is fed into the time-frequency model, the 0th modulated symbol of this group is duplicated into copies, then spread onto positions including the 0th sub-carrier in the 0th OFDM symbol by the 0th chip of the th orthogonal code, the 1st sub-carrier in the 1st OFDM symbol by the 1st chip of ; the 1st modulated symbol of this group is duplicated and spread onto positions including the 1st sub-carrier in the 0th OFDM symbol by the 0th chip of, the 2nd sub-carrier in the 1st OFDM symbol by the 1st chip of etc. By this method, each modulated symbol of one group can be spread onto the different sub-carriers in the different OFDM symbols by one orthogonal code. Each user will be allocated /$ IEEE

2 IEEE TRANSACTIONS ON BROADCASTING, VOL. 51, NO. 1, MARCH where is the th path gain of the th user, which is independently complex Gaussian random process with zero mean and variance for different and ; is the propagation delay for the th path of the th user. If the cyclic prefix is longer than the impulse of the channel, then it is assumed that the narrowband signal that is transmitted through each subcarrier experiences a nonselective Rayleigh fading channel. Furthermore, each amplitude and phase of the channel for a narrowband signal keeps constant in each subcarrier. The frequency response of the fading channel assumed for the th user at the th subcarrier can be expressed as (3) Fig. 1. Time-frequency spreading grid pattern of the kth user. For the sake of analysis, it also can be rewritten as (4) with one orthogonal code and spread its information data over the frequency and time domain uniformly. When the time-frequency spreading grid patterns are designed, the common principle is to spread the information of the same modulation symbol onto the different sub-carriers and different OFDM symbols in order to obtain both time diversity gain and frequency diversity gain simultaneously. Furthermore, in order to achieve time diversity gain well, the duration of one frame should be close or larger than the channel coherent time. So the length of frame must be designed carefully according to the typical mobile communication environment. On the other hand, the frequency diversity gain can be obtained more easily since the bandwidth occupied by several sub-carriers, on which the same modulated symbol is spread, is much larger than the channel coherent bandwidth. The transmitted signal for the th user may be expressed as (1) where is the transmitted power, is the th user s th data symbol of the th frame at the th subcarrier and is the th chip of the th user s orthogonal spreading code. is the th subcarrier frequency. is the rectangular pulse response defined on the interval. Here is the residue of modulo. The channel of the th user is modeled as a wide sense stationary, uncorrelated scattering (WSSUS), Rayleigh fading channel with paths in the complex equivalent low-pass time-variant impulse response (2) where the random amplitudes of each individual user are assumed to be correlated Rayleigh random variables for different subcarriers; the random phases of each individual user are assumed to be uniform random variables on the interval for different subcarriers. The received signal can be written as (5), shown at the bottom of the page, where is the number of active users, is the complex envelope of additive white Gaussian noise (AWGN) with zero mean and double-sided power spectral density. At the receiver, the despreading and combining procedure with the time-frequency spreading grid pattern corresponding to the transmitter can t be processed until all the symbols within one frame are received. Without the loss of generality, the signal from the 0th user is regarded as the desired signal and the signals from all other users as interference signals. With coherent demodulation, the decision variable for the 0th data symbol of the th frame is given by (6) (9), shown at the top of the next page. The desired signal component, multiple access interference (MAI) and the noise component are,,, respectively. III. BIT ERROR RATE ANALYSIS FOR MRC Maximum-ratio combining (MRC) is considered in this section. Frame index is omitted for simplification in the rest of the paper. Ideal channel frequency response for the 0th user is assumed to be available at the receiver, and its sampled value at the th symbol in the th OFDM symbol during one frame can be expressed as (10) Then, the MRC gain corresponding to the 0th data symbol is given by (11) (5)

3 146 IEEE TRANSACTIONS ON BROADCASTING, VOL. 51, NO. 1, MARCH 2005 (6) and (7) (8) (9) Then Characteristic function of can be written as (12) (13) (14) where. Since are uniformly distributed over, the probability density function of can be easily obtained and. Assuming that the number of subcarriers is large and the input data symbols are random, MAI can be approximated by a Gaussian random variable with zero mean and variance where,. And (15) (16) The conditional signal to noise and interference (SNIR) of the 0th user conditioned on can be expressed as (17) Since and are mutually independent, the probability of error conditioned on can be simply given by To compute its distribution, as follows: can be expressed by where. (18) (19) (20) And the covariance matrix of can be expressed as [10] (21) Furthermore, (20) can be simplified by mean of the unitary decomposition of the matrix. The simplified form of characteristic function [11] is given by (22) where are eigenvalues of and denotes matrix determinant. By the inverse transfer of (22), the probability density function of can be calculated by (23) Then, the integral of (23) can be simply calculated by the sum of residues. There are two resulted pdfs from the eigenvalues of as follows: all all are equal are not equal. (24) Finally, to compute the average BER, we must statistically average (18) over the probability density function of, i.e., (25) It is assumed that any bit sent via any of the data in one frame with equal error probability and the BER of each user is equal. Therefore, the system average BER is given by (26)

4 IEEE TRANSACTIONS ON BROADCASTING, VOL. 51, NO. 1, MARCH On the other hand, in 1D MC-CDMA systems, the conditional signal to noise and interference (SNIR) of the 0th user conditioned on, which is only related to one OFDM symbol so that time index for is omitted, can be expressed as (27) Similar to, can be also expressed by (28) where. And the covariance matrix of can be expressed as (29) which is only dependent on the frequency spacing between different subcarriers. Then, the probability density function of can be calculated by using the similar method that was described above for 2D OFDM-CDMA system. And the average BER of 1D MC-CDMA can be obtained by statistically averaging its conditioned BER over the probability density function of. Fig. 2. Probability density function (pdf) of and (1) Solid lines calculated (2) Dot lines simulated. IV. NUMERICAL AND SIMULATION RESULTS In order to compare the performances of our proposed 2D OFDM-CDMA system and 1D MC-CDMA system, the fading channel and the system parameters are kept same. Both computer simulation and numerical analysis are carried out to investigate the performance gain of the system with joint frequency-time spreading. The channel is a multipath channel modeled as a finite tapped delay line with Rayleigh fading paths and the multipath intensity profile of the channel is exponential with. Each path of the channel is modeled by a classical Doppler spectrum. The bandwidth used is MHz at a carrier frequency band GHz. The period of one OFDM symbol including effective symbol period, 32, and cyclic prefix, 8, is40. Walsh-Hadamard (WH) codes are utilized for spreading. Different codes are allocated to different users. The spacing of subcarrier is 31.3 khz and the number of subcarrier 64, which equal to the length of the orthogonal spreading code. To calculate the BER, it is assumed that the mean power of each interfering user is equal to the mean power of the desired signal. Fig. 2 shows the probability density function of and respectively, which are generated by simulation using Monte-Carlo method or by calculation from (21), (24) and (29). The probability of the event that is large value is a little bigger than that of, which means that the average SNIR of proposed system will be more likely to be higher than that of the MC-CDMA system. So the better BER performance of 2D OFDM-CDMA system is expected. In Fig. 3, the performances of MC-CDMA with 1D spreading and OFDM-CDMA with 2D spreading in term of BER with different mobile speeds are compared. The Doppler frequency is up to 83, 139, or 555 Hz when mobile speed up to 18, 30, or 120 km/h, respectively, which is much less than Fig. 3. BER comparison between 2D OFDM-CDMA and 1D MC-CDMA Systems with different mobile speed (single user, N =64) (1) Dash dot lines 1D MC-CDMA (2) Solid lines 2D OFDM-CDMA. the spacing of subcarrier. Therefore, the inter-carrier-interference caused by Doppler frequency can be omitted. Then, the BER performance of 1D MC-CDMA system won t be affected by the mobile speed as shown in Fig. 3. On the other hand, with the increase of the mobile speed, the channel coherence time becomes close or even smaller than the duration of one processing frame of 2D OFDM-CDMA. So that the time diversity gain can be more easily achieved by joint frequency-time spreading method and the BER performance of 2D OFDM-CDMA system becomes better. Higher mobile speed, the gain between 2D and 1D system becomes larger. If the target BER is assumed to be, it is clear the gain with 2D OFDM-CDMA compared with 1D MC-CDMA is about 2 db or 4 db when the mobile speed is 30 km/h or 120 km/h, respectively. Fig. 4 shows the BER performance of 1D MC-CDMA and 2D OFDM-CDMA systems versus the average with different number of active users when the mobile speed is 30 km/h. As shown in Fig. 4, the BER performance become worse in both systems with the increase of the number of active users due to multiple access interference. Moreover, the performances

5 148 IEEE TRANSACTIONS ON BROADCASTING, VOL. 51, NO. 1, MARCH 2005 Fig. 4. BER comparison between 2D OFDM-CDMA and 1D MC-CDMA systems with multiple users, N =64and mobile speed =30km=h (1) Solid lines 2D OFDM-CDMA (2) Dash dot lines 1D MC-CDMA. of 2D OFDM-CDMA still keep little better than those of 1D MC-CDMA. V. CONCLUSION In this paper we propose a novel OFDM-CDMA system with joint time-frequency spreading method. The performance of the joint time-frequency spreading OFDM-CDMA systems is analyzed over time-frequency selective fading channel. Numerical analysis and simulation results show that the proposed system performs better than the traditional MC-CDMA system, especially in the fast fading channel, by making full use of both time and frequency diversity. REFERENCES [1] Radio Broadcasting Systems: Digital Audio Broadcasting (DAB) to Mobile, Portable and Fixed Receivers, ETSI, ETSI ETS , Feb [2] Digital Video Broadcasting (DVB): Frame Structure, Channel Coding and Modulation for Gigital Terrestrial Television (DVB-T), ETSI, ETSI ETS , Mar [3] A. Doufexi et al., IEEE Commun. Mag., vol. 40, no. 5, pp , May [4] M. Chrysochoos and J. Kim, Performance analysis of an MC-CDMA broadcasting system under high power amplifier nonlinearities.i. System proposal, IEEE Trans. Broadcast., vol. 46, pp , Dec [5] A. S. Madhukumar and F. Chin, Residue number system-based multicarrier CDMA system for high-speed broadband wireless access, IEEE Trans. Broadcast., vol. 48, pp , Mar [6] Y.-H. You, W.-G. Jeon, J.-H. Paik, and H.-K. Song, A simple construction of OFDM-CDMA signals with low peak-to-average power ratio, IEEE Trans. Broadcast., vol. 49, pp , Dec [7] R. Prasad and S. Hara, An overview of multi-carrier CDMA, in Proc. IEEE 4th Int. Symp. Spread Spectrum Techniques and Applications, Mainz, Sep , 1996, pp [8] S. Kaiser and K. Fazel, A flexible spread-spectrum multi-carrier multiple-access system for multi-media applications, in Proc Int. Symp. Personal, Indoor and Mobile Radio Communications, Helsinki, Finland, Sep. 1 4, 1997, pp [9] S. Kaiser, OFDM code-division multiplexing in fading channels, IEEE Trans. Commun., vol. 50, pp , Aug [10] P. K. Frenger, N. Arne, and B. Svensson, Decision-directed coherent detection in multicarrier systems on Rayleigh fading channel, IEEE Trans. Veh. Technol., vol. 48, pp , Mar [11] J. N. Pierce and S. Stein, Multiple diversity with nonindependent fading, Proc. IRE, pp , Jan

Performance of Wideband Mobile Channel with Perfect Synchronism BPSK vs QPSK DS-CDMA

Performance of Wideband Mobile Channel with Perfect Synchronism BPSK vs QPSK DS-CDMA Performance of Wideband Mobile Channel with Perfect Synchronism BPSK vs QPSK DS-CDMA By Hamed D. AlSharari College of Engineering, Aljouf University, Sakaka, Aljouf 2014, Kingdom of Saudi Arabia, hamed_100@hotmail.com

More information

Multi-Carrier Systems

Multi-Carrier Systems Wireless Information Transmission System Lab. Multi-Carrier Systems 2006/3/9 王森弘 Institute of Communications Engineering National Sun Yat-sen University Outline Multi-Carrier Systems Overview Multi-Carrier

More information

EC 551 Telecommunication System Engineering. Mohamed Khedr

EC 551 Telecommunication System Engineering. Mohamed Khedr EC 551 Telecommunication System Engineering Mohamed Khedr http://webmail.aast.edu/~khedr 1 Mohamed Khedr., 2008 Syllabus Tentatively Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8 Week 9 Week

More information

An Equalization Technique for Orthogonal Frequency-Division Multiplexing Systems in Time-Variant Multipath Channels

An Equalization Technique for Orthogonal Frequency-Division Multiplexing Systems in Time-Variant Multipath Channels IEEE TRANSACTIONS ON COMMUNICATIONS, VOL 47, NO 1, JANUARY 1999 27 An Equalization Technique for Orthogonal Frequency-Division Multiplexing Systems in Time-Variant Multipath Channels Won Gi Jeon, Student

More information

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

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

More information

Maximum-Likelihood Co-Channel Interference Cancellation with Power Control for Cellular OFDM Networks

Maximum-Likelihood Co-Channel Interference Cancellation with Power Control for Cellular OFDM Networks Maximum-Likelihood Co-Channel Interference Cancellation with Power Control for Cellular OFDM Networks Manar Mohaisen and KyungHi Chang The Graduate School of Information Technology and Telecommunications

More information

Performance of a Flexible Form of MC-CDMA in a Cellular System

Performance of a Flexible Form of MC-CDMA in a Cellular System Performance of a Flexible Form of MC-CDMA in a Cellular System Heidi Steendam and Marc Moeneclaey Department of Telecommunications and Information Processing, University of Ghent, B-9000 GENT, BELGIUM

More information

Cognitive Radio Transmission Based on Chip-level Space Time Block Coded MC-DS-CDMA over Fast-Fading Channel

Cognitive Radio Transmission Based on Chip-level Space Time Block Coded MC-DS-CDMA over Fast-Fading Channel Journal of Scientific & Industrial Research Vol. 73, July 2014, pp. 443-447 Cognitive Radio Transmission Based on Chip-level Space Time Block Coded MC-DS-CDMA over Fast-Fading Channel S. Mohandass * and

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

SC - Single carrier systems One carrier carries data stream

SC - Single carrier systems One carrier carries data stream Digital modulation SC - Single carrier systems One carrier carries data stream MC - Multi-carrier systems Many carriers are used for data transmission. Data stream is divided into sub-streams and each

More information

Spatial Transmit Diversity Techniques for Broadband OFDM Systems

Spatial Transmit Diversity Techniques for Broadband OFDM Systems Spatial Transmit Diversity Techniques for roadband Systems Stefan Kaiser German Aerospace Center (DLR), Institute of Communications and Navigation 82234 Oberpfaffenhofen, Germany; E mail: Stefan.Kaiser@dlr.de

More information

OFDM Code Division Multiplexing with Unequal Error Protection and Flexible Data Rate Adaptation

OFDM Code Division Multiplexing with Unequal Error Protection and Flexible Data Rate Adaptation OFDM Code Division Multiplexing with Unequal Error Protection and Flexible Data Rate Adaptation Stefan Kaiser German Aerospace Center (DLR) Institute of Communications and Navigation 834 Wessling, Germany

More information

Single Carrier Ofdm Immune to Intercarrier Interference

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

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

BER Analysis for MC-CDMA

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

More information

Comparison between Performances of Channel estimation Techniques for CP-LTE and ZP-LTE Downlink Systems

Comparison between Performances of Channel estimation Techniques for CP-LTE and ZP-LTE Downlink Systems Comparison between Performances of Channel estimation Techniques for CP-LTE and ZP-LTE Downlink Systems Abdelhakim Khlifi 1 and Ridha Bouallegue 2 1 National Engineering School of Tunis, Tunisia abdelhakim.khlifi@gmail.com

More information

Performance of Generalized Multicarrier DS-CDMA Using Various Chip Waveforms

Performance of Generalized Multicarrier DS-CDMA Using Various Chip Waveforms 748 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 51, NO. 5, MAY 2003 Performance of Generalized Multicarrier DS-CDMA Using Various Chip Waveforms Lie-Liang Yang, Senior Member, IEEE, Lajos Hanzo, Senior Member,

More information

The Effect of Carrier Frequency Offsets on Downlink and Uplink MC-DS-CDMA

The Effect of Carrier Frequency Offsets on Downlink and Uplink MC-DS-CDMA 2528 IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 19, NO. 12, DECEMBER 2001 The Effect of Carrier Frequency Offsets on Downlink and Uplink MC-DS-CDMA Heidi Steendam and Marc Moeneclaey, Senior

More information

Performance analysis of MISO-OFDM & MIMO-OFDM Systems

Performance analysis of MISO-OFDM & MIMO-OFDM Systems Performance analysis of MISO-OFDM & MIMO-OFDM Systems Kavitha K V N #1, Abhishek Jaiswal *2, Sibaram Khara #3 1-2 School of Electronics Engineering, VIT University Vellore, Tamil Nadu, India 3 Galgotias

More information

Forschungszentrum Telekommunikation Wien

Forschungszentrum Telekommunikation Wien Forschungszentrum Telekommunikation Wien OFDMA/SC-FDMA Basics for 3GPP LTE (E-UTRA) T. Zemen April 24, 2008 Outline Part I - OFDMA and SC/FDMA basics Multipath propagation Orthogonal frequency division

More information

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

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

More information

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

More information

Frequency-Hopped Multiple-Access Communications with Multicarrier On Off Keying in Rayleigh Fading Channels

Frequency-Hopped Multiple-Access Communications with Multicarrier On Off Keying in Rayleigh Fading Channels 1692 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 48, NO. 10, OCTOBER 2000 Frequency-Hopped Multiple-Access Communications with Multicarrier On Off Keying in Rayleigh Fading Channels Seung Ho Kim and Sang

More information

DESIGN AND ANALYSIS OF MULTIBAND OFDM SYSTEM OVER ULTRA WIDE BAND CHANNELS

DESIGN AND ANALYSIS OF MULTIBAND OFDM SYSTEM OVER ULTRA WIDE BAND CHANNELS DESIGN AND ANALYSIS OF MULTIBAND OFDM SYSTEM OVER ULTRA WIDE BAND CHANNELS G.Joselin Retna Kumar Research Scholar, Sathyabama University, Chennai, Tamil Nadu, India joselin_su@yahoo.com K.S.Shaji Principal,

More information

Decrease Interference Using Adaptive Modulation and Coding

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

More information

SPREADING SEQUENCES SELECTION FOR UPLINK AND DOWNLINK MC-CDMA SYSTEMS

SPREADING SEQUENCES SELECTION FOR UPLINK AND DOWNLINK MC-CDMA SYSTEMS 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

More information

THE EFFECT of multipath fading in wireless systems can

THE EFFECT of multipath fading in wireless systems can IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 47, NO. 1, FEBRUARY 1998 119 The Diversity Gain of Transmit Diversity in Wireless Systems with Rayleigh Fading Jack H. Winters, Fellow, IEEE Abstract In

More information

MITIGATING CARRIER FREQUENCY OFFSET USING NULL SUBCARRIERS

MITIGATING CARRIER FREQUENCY OFFSET USING NULL SUBCARRIERS International Journal on Intelligent Electronic System, Vol. 8 No.. July 0 6 MITIGATING CARRIER FREQUENCY OFFSET USING NULL SUBCARRIERS Abstract Nisharani S N, Rajadurai C &, Department of ECE, Fatima

More information

Orthogonal frequency division multiplexing (OFDM)

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

More information

Study of Turbo Coded OFDM over Fading Channel

Study of Turbo Coded OFDM over Fading Channel International Journal of Engineering Research and Development e-issn: 2278-067X, p-issn: 2278-800X, www.ijerd.com Volume 3, Issue 2 (August 2012), PP. 54-58 Study of Turbo Coded OFDM over Fading Channel

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

OFDM AS AN ACCESS TECHNIQUE FOR NEXT GENERATION NETWORK

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

More information

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

More information

A New Data Conjugate ICI Self Cancellation for OFDM System

A New Data Conjugate ICI Self Cancellation for OFDM System A New Data Conjugate ICI Self Cancellation for OFDM System Abhijeet Bishnu Anjana Jain Anurag Shrivastava Department of Electronics and Telecommunication SGSITS Indore-452003 India abhijeet.bishnu87@gmail.com

More information

Prof. P. Subbarao 1, Veeravalli Balaji 2

Prof. P. Subbarao 1, Veeravalli Balaji 2 Performance Analysis of Multicarrier DS-CDMA System Using BPSK Modulation Prof. P. Subbarao 1, Veeravalli Balaji 2 1 MSc (Engg), FIETE, MISTE, Department of ECE, S.R.K.R Engineering College, A.P, India

More information

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 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

More information

OFDM system: Discrete model Spectral efficiency Characteristics. OFDM based multiple access schemes. OFDM sensitivity to synchronization errors

OFDM system: Discrete model Spectral efficiency Characteristics. OFDM based multiple access schemes. OFDM sensitivity to synchronization errors Introduction - Motivation OFDM system: Discrete model Spectral efficiency Characteristics OFDM based multiple access schemes OFDM sensitivity to synchronization errors 4 OFDM system Main idea: to divide

More information

Key words: OFDM, FDM, BPSK, QPSK.

Key words: OFDM, FDM, BPSK, QPSK. Volume 4, Issue 3, March 2014 ISSN: 2277 128X International Journal of Advanced Research in Computer Science and Software Engineering Research Paper Available online at: www.ijarcsse.com Analyse the Performance

More information

On the Spectral Efficiency of MIMO MC-CDMA System

On the Spectral Efficiency of MIMO MC-CDMA System I J C T A, 9(19) 2016, pp. 9311-9316 International Science Press On the Spectral Efficiency of MIMO MC-CDMA System Madhvi Jangalwa and Vrinda Tokekar ABSTRACT The next generation wireless communication

More information

Orthogonal Frequency Division Multiplexing & Measurement of its Performance

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,

More information

Performance Analysis of Concatenated RS-CC Codes for WiMax System using QPSK

Performance Analysis of Concatenated RS-CC Codes for WiMax System using QPSK Performance Analysis of Concatenated RS-CC Codes for WiMax System using QPSK Department of Electronics Technology, GND University Amritsar, Punjab, India Abstract-In this paper we present a practical RS-CC

More information

DSRC using OFDM for roadside-vehicle communication systems

DSRC using OFDM for roadside-vehicle communication systems DSRC using OFDM for roadside-vehicle communication systems Akihiro Kamemura, Takashi Maehata SUMITOMO ELECTRIC INDUSTRIES, LTD. Phone: +81 6 6466 5644, Fax: +81 6 6462 4586 e-mail:kamemura@rrad.sei.co.jp,

More information

ENHANCING BER PERFORMANCE FOR OFDM

ENHANCING BER PERFORMANCE FOR OFDM RESEARCH ARTICLE OPEN ACCESS ENHANCING BER PERFORMANCE FOR OFDM Amol G. Bakane, Prof. Shraddha Mohod Electronics Engineering (Communication), TGPCET Nagpur Electronics & Telecommunication Engineering,TGPCET

More information

BEING wideband, chaotic signals are well suited for

BEING wideband, chaotic signals are well suited for 680 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II: EXPRESS BRIEFS, VOL. 51, NO. 12, DECEMBER 2004 Performance of Differential Chaos-Shift-Keying Digital Communication Systems Over a Multipath Fading Channel

More information

A SURVEY OF LOW COMPLEXITY ESTIMATOR FOR DOWNLINK MC-CDMA SYSTEMS

A SURVEY OF LOW COMPLEXITY ESTIMATOR FOR DOWNLINK MC-CDMA SYSTEMS A SURVEY OF LOW COMPLEXITY ESTIMATOR FOR DOWNLINK MC-CDMA SYSTEMS Nitin Kumar Suyan, Mrs. Garima Saini Abstract This paper provides a survey among different types of channel estimation schemes for MC-CDMA.

More information

DIGITAL Radio Mondiale (DRM) is a new

DIGITAL Radio Mondiale (DRM) is a new Synchronization Strategy for a PC-based DRM Receiver Volker Fischer and Alexander Kurpiers Institute for Communication Technology Darmstadt University of Technology Germany v.fischer, a.kurpiers @nt.tu-darmstadt.de

More information

Improving Channel Estimation in OFDM System Using Time Domain Channel Estimation for Time Correlated Rayleigh Fading Channel Model

Improving Channel Estimation in OFDM System Using Time Domain Channel Estimation for Time Correlated Rayleigh Fading Channel Model International Journal of Engineering Science Invention ISSN (Online): 2319 6734, ISSN (Print): 2319 6726 Volume 2 Issue 8 ǁ August 2013 ǁ PP.45-51 Improving Channel Estimation in OFDM System Using Time

More information

Wireless Communication: Concepts, Techniques, and Models. Hongwei Zhang

Wireless Communication: Concepts, Techniques, and Models. Hongwei Zhang Wireless Communication: Concepts, Techniques, and Models Hongwei Zhang http://www.cs.wayne.edu/~hzhang Outline Digital communication over radio channels Channel capacity MIMO: diversity and parallel channels

More information

Optimal Number of Pilots for OFDM Systems

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

More information

LETTER A Simple Expression of BER Performance in COFDM Systems over Fading Channels

LETTER A Simple Expression of BER Performance in COFDM Systems over Fading Channels 33 IEICE TRANS. FUNDAMENTALS, VOL.E9 A, NO.1 JANUARY 009 LETTER A Simple Expression of BER Performance in COFDM Systems over Fading Channels Fumihito SASAMORI a), Member, Yuya ISHIKAWA, Student Member,

More information

Comparative Study of OFDM & MC-CDMA in WiMAX System

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

More information

666 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 53, NO. 4, APRIL 2005

666 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 53, NO. 4, APRIL 2005 666 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL 53, NO 4, APRIL 2005 Analysis of Asynchronous Long-Code Multicarrier CDMA Systems With Correlated Fading Feng-Tsun Chien, Student Member, IEEE, Chien-Hwa Hwang,

More information

Evaluation of channel estimation combined with ICI self-cancellation scheme in doubly selective fading channel

Evaluation of channel estimation combined with ICI self-cancellation scheme in doubly selective fading channel ISSN (Online): 2409-4285 www.ijcsse.org Page: 1-7 Evaluation of channel estimation combined with ICI self-cancellation scheme in doubly selective fading channel Lien Pham Hong 1, Quang Nguyen Duc 2, Dung

More information

Error Probability of Different Modulation Schemes for OFDM based WLAN standard IEEE a

Error Probability of Different Modulation Schemes for OFDM based WLAN standard IEEE a Error Probability of Different Modulation Schemes for OFDM based WLAN standard IEEE 802.11a Sanjeev Kumar Asst. Professor/ Electronics & Comm. Engg./ Amritsar college of Engg. & Technology, Amritsar, 143001,

More information

RECENTLY, a number of muticarrier code-division

RECENTLY, a number of muticarrier code-division 1022 IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 54, NO. 3, MAY 2005 Effect of Chip Waveform Shaping on the Performance of Multicarrier CDMA Systems Ha H. Nguyen, Member, IEEE Abstract This paper studies

More information

Joint Transmitter-Receiver Adaptive Forward-Link DS-CDMA System

Joint Transmitter-Receiver Adaptive Forward-Link DS-CDMA System # - Joint Transmitter-Receiver Adaptive orward-link D-CDMA ystem Li Gao and Tan. Wong Department of Electrical & Computer Engineering University of lorida Gainesville lorida 3-3 Abstract A joint transmitter-receiver

More information

Design and Implementation of OFDM System and Reduction of Inter-Carrier Interference at Different Variance

Design and Implementation of OFDM System and Reduction of Inter-Carrier Interference at Different Variance Design and Implementation of OFDM System and Reduction of Inter-Carrier Interference at Different Variance Gaurav Verma 1, Navneet Singh 2 1 Research Scholar, JCDMCOE, Sirsa, Haryana, India 2 Assistance

More information

Testing The Effective Performance Of Ofdm On Digital Video Broadcasting

Testing The Effective Performance Of Ofdm On Digital Video Broadcasting The 1 st Regional Conference of Eng. Sci. NUCEJ Spatial ISSUE vol.11,no.2, 2008 pp 295-302 Testing The Effective Performance Of Ofdm On Digital Video Broadcasting Ali Mohammed Hassan Al-Bermani College

More information

International Conference On Communication Technology Proceedings, Icct, 1998, v. 2, p. S42021-S42024

International Conference On Communication Technology Proceedings, Icct, 1998, v. 2, p. S42021-S42024 Title Asynchronous Orthogonal Multi-Carrier CDMA Using Equal Gain Combining in Multipath Rayleigh Fading Channel Author(s) Xiang, G; Ng, TS Citation International Conference On Communication Technology

More information

Wireless Medium Access Control and CDMA-based Communication Lesson 16 Orthogonal Frequency Division Medium Access (OFDM)

Wireless Medium Access Control and CDMA-based Communication Lesson 16 Orthogonal Frequency Division Medium Access (OFDM) Wireless Medium Access Control and CDMA-based Communication Lesson 16 Orthogonal Frequency Division Medium Access (OFDM) 1 4G File transfer at 10 Mbps High resolution 1024 1920 pixel hi-vision picture

More information

Survey on Effective OFDM Technology for 4G

Survey on Effective OFDM Technology for 4G Survey on Effective OFDM Technology for 4G Kanchan Vijay Patil, 2 R D Patane, Lecturer, 2 Professor, Electronics and Telecommunication, ARMIET, Shahpur, India 2 Terna college of engineering, Nerul, India

More information

MULTIPLE transmit-and-receive antennas can be used

MULTIPLE transmit-and-receive antennas can be used IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 1, NO. 1, JANUARY 2002 67 Simplified Channel Estimation for OFDM Systems With Multiple Transmit Antennas Ye (Geoffrey) Li, Senior Member, IEEE Abstract

More information

Utilization of Multipaths for Spread-Spectrum Code Acquisition in Frequency-Selective Rayleigh Fading Channels

Utilization of Multipaths for Spread-Spectrum Code Acquisition in Frequency-Selective Rayleigh Fading Channels 734 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 49, NO. 4, APRIL 2001 Utilization of Multipaths for Spread-Spectrum Code Acquisition in Frequency-Selective Rayleigh Fading Channels Oh-Soon Shin, Student

More information

Multirate schemes for multimedia applications in DS/CDMA Systems

Multirate schemes for multimedia applications in DS/CDMA Systems Multirate schemes for multimedia applications in DS/CDMA Systems Tony Ottosson and Arne Svensson Dept. of Information Theory, Chalmers University of Technology, S-412 96 Göteborg, Sweden phone: +46 31

More information

Combined Transmitter Diversity and Multi-Level Modulation Techniques

Combined Transmitter Diversity and Multi-Level Modulation Techniques SETIT 2005 3rd International Conference: Sciences of Electronic, Technologies of Information and Telecommunications March 27 3, 2005 TUNISIA Combined Transmitter Diversity and Multi-Level Modulation Techniques

More information

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

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

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

Noise Plus Interference Power Estimation in Adaptive OFDM Systems

Noise Plus Interference Power Estimation in Adaptive OFDM Systems Noise Plus Interference Power Estimation in Adaptive OFDM Systems Tevfik Yücek and Hüseyin Arslan Department of Electrical Engineering, University of South Florida 4202 E. Fowler Avenue, ENB-118, Tampa,

More information

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 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

More information

THE DRM (digital radio mondiale) system designed

THE DRM (digital radio mondiale) system designed A Comparison between Alamouti Transmit Diversity and (Cyclic) Delay Diversity for a DRM+ System Henrik Schulze University of Applied Sciences South Westphalia Lindenstr. 53, D-59872 Meschede, Germany Email:

More information

A Unified Perspective of Different Multicarrier CDMA Schemes

A Unified Perspective of Different Multicarrier CDMA Schemes 26 IEEE Ninth International Symposium on Spread Spectrum Techniques and Applications A Unified Perspective of Different Multicarrier CDMA Schemes Yongfeng Chen Dept of ECE, University of Toronto Toronto,

More information

Challenges for Broadband Wireless Technology

Challenges for Broadband Wireless Technology Challenges for Broadband Wireless Technology Fumiyuki Adachi Electrical and Communication Engineering Graduate School of Engineering, Tohoku University 05 Aza-Aoba, Aramaki, Aoba-ku, Sendai, 980-8579 Japan

More information

Linear MMSE detection technique for MC-CDMA

Linear MMSE detection technique for MC-CDMA Linear MMSE detection technique for MC-CDMA Jean-François Hélard, Jean-Yves Baudais, Jacques Citerne o cite this version: Jean-François Hélard, Jean-Yves Baudais, Jacques Citerne. Linear MMSE detection

More information

ESTIMATION OF FREQUENCY SELECTIVITY FOR OFDM BASED NEW GENERATION WIRELESS COMMUNICATION SYSTEMS

ESTIMATION OF FREQUENCY SELECTIVITY FOR OFDM BASED NEW GENERATION WIRELESS COMMUNICATION SYSTEMS ESTIMATION OF FREQUENCY SELECTIVITY FOR OFDM BASED NEW GENERATION WIRELESS COMMUNICATION SYSTEMS Hüseyin Arslan and Tevfik Yücek Electrical Engineering Department, University of South Florida 422 E. Fowler

More information

DUE TO the enormous growth of wireless services (cellular

DUE TO the enormous growth of wireless services (cellular IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 47, NO. 12, DECEMBER 1999 1811 Analysis and Optimization of the Performance of OFDM on Frequency-Selective Time-Selective Fading Channels Heidi Steendam and Marc

More information

PERFORMANCE ANALYSIS OF MC-CDMA SYSTEM USING BPSK MODULATION

PERFORMANCE ANALYSIS OF MC-CDMA SYSTEM USING BPSK MODULATION International Journal of Research in Engineering & Technology (IJRET) Vol. 1, Issue 1, June 2013, 45-52 Impact Journals PERFORMANCE ANALYSIS OF MC-CDMA SYSTEM USING BPSK MODULATION G. BRINDHA Assistant

More information

Performance Evaluation of STBC-OFDM System for 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

More information

Performance Enhancement of Multi User Detection for the MC-CDMA

Performance Enhancement of Multi User Detection for the MC-CDMA Performance Enhancement of Multi User Detection for the MC-CDMA Ramabhai Patel M.E., Department of Electronics & Communication, L.D.College of Engineering, Gujarat, India ABSTRACT:The bit error rate of

More information

IEEE Transactions on Vehicular Technology, 2002, v. 51 n. 5, p

IEEE Transactions on Vehicular Technology, 2002, v. 51 n. 5, p Title Multicarrier DS/SFH-CDMA systems Author(s) Wang, J; Huang, H Citation IEEE Transactions on Vehicular Technology, 2002, v. 51 n. 5, p. 867-876 Issued Date 2002 URL http://hdl.handle.net/10722/42920

More information

Technical Aspects of LTE Part I: OFDM

Technical Aspects of LTE Part I: OFDM Technical Aspects of LTE Part I: OFDM By Mohammad Movahhedian, Ph.D., MIET, MIEEE m.movahhedian@mci.ir ITU regional workshop on Long-Term Evolution 9-11 Dec. 2013 Outline Motivation for LTE LTE Network

More information

Performance of Orthogonal Frequency Division Multiplexing System Based on Mobile Velocity and Subcarrier

Performance of Orthogonal Frequency Division Multiplexing System Based on Mobile Velocity and Subcarrier Journal of Computer Science 6 (): 94-98, 00 ISSN 549-3636 00 Science Publications Performance of Orthogonal Frequency Division Multiplexing System ased on Mobile Velocity and Subcarrier Zulkeflee in halidin

More information

Channel Estimation and Signal Detection for Multi-Carrier CDMA Systems with Pulse-Shaping Filter

Channel Estimation and Signal Detection for Multi-Carrier CDMA Systems with Pulse-Shaping Filter Channel Estimation and Signal Detection for MultiCarrier CDMA Systems with PulseShaping Filter 1 Mohammad Jaber Borran, Prabodh Varshney, Hannu Vilpponen, and Panayiotis Papadimitriou Nokia Mobile Phones,

More information

SHIV SHAKTI International Journal of in Multidisciplinary and Academic Research (SSIJMAR) Vol. 3, No. 4, August-September (ISSN )

SHIV SHAKTI International Journal of in Multidisciplinary and Academic Research (SSIJMAR) Vol. 3, No. 4, August-September (ISSN ) SHIV SHAKTI International Journal of in Multidisciplinary and Academic Research (SSIJMAR) Vol. 3, No. 4, August-September (ISSN 2278 5973) Orthogonal Frequency Division Multiplexing: Issues and Applications

More information

2-2 Advanced Wireless Packet Cellular System using Multi User OFDM- SDMA/Inter-BTS Cooperation with 1.3 Gbit/s Downlink Capacity

2-2 Advanced Wireless Packet Cellular System using Multi User OFDM- SDMA/Inter-BTS Cooperation with 1.3 Gbit/s Downlink Capacity 2-2 Advanced Wireless Packet Cellular System using Multi User OFDM- SDMA/Inter-BTS Cooperation with 1.3 Gbit/s Downlink Capacity KAWAZAWA Toshio, INOUE Takashi, FUJISHIMA Kenzaburo, TAIRA Masanori, YOSHIDA

More information

2: Diversity. 2. Diversity. Some Concepts of Wireless Communication

2: Diversity. 2. Diversity. Some Concepts of Wireless Communication 2. Diversity 1 Main story Communication over a flat fading channel has poor performance due to significant probability that channel is in a deep fade. Reliability is increased by providing more resolvable

More information

Effects of Fading Channels on OFDM

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

More information

Achievable-SIR-Based Predictive Closed-Loop Power Control in a CDMA Mobile System

Achievable-SIR-Based Predictive Closed-Loop Power Control in a CDMA Mobile System 720 IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 51, NO. 4, JULY 2002 Achievable-SIR-Based Predictive Closed-Loop Power Control in a CDMA Mobile System F. C. M. Lau, Member, IEEE and W. M. Tam Abstract

More information

A novel multiple access scheme for mobile communications systems

A novel multiple access scheme for mobile communications systems Indian Journal of Radio & Space Physics Vol. 36, October 7, pp. 43-435 A novel multiple access scheme for mobile communications systems Poonam Singh, R V Raja umar & S Lamba Department of Electronics &

More information

COMPARISON OF CHANNEL ESTIMATION AND EQUALIZATION TECHNIQUES FOR OFDM SYSTEMS

COMPARISON OF CHANNEL ESTIMATION AND EQUALIZATION TECHNIQUES FOR OFDM SYSTEMS COMPARISON OF CHANNEL ESTIMATION AND EQUALIZATION TECHNIQUES FOR OFDM SYSTEMS Sanjana T and Suma M N Department of Electronics and communication, BMS College of Engineering, Bangalore, India ABSTRACT In

More information

TERRESTRIAL television broadcasting has been widely

TERRESTRIAL television broadcasting has been widely IEEE TRANSACTIONS ON BROADCASTING, VOL. 52, NO. 2, JUNE 2006 245 A General SFN Structure With Transmit Diversity for TDS-OFDM System Jian-Tao Wang, Jian Song, Jun Wang, Chang-Yong Pan, Zhi-Xing Yang, Lin

More information

Channel Estimation by 2D-Enhanced DFT Interpolation Supporting High-speed Movement

Channel Estimation by 2D-Enhanced DFT Interpolation Supporting High-speed Movement Channel Estimation by 2D-Enhanced DFT Interpolation Supporting High-speed Movement Channel Estimation DFT Interpolation Special Articles on Multi-dimensional MIMO Transmission Technology The Challenge

More information

Performance Analysis/Study of OFDM Based DVB-T System under AWGN, Rayleigh and Rician Channels

Performance Analysis/Study of OFDM Based DVB-T System under AWGN, Rayleigh and Rician Channels IJSRD National Conference on Advances in Computing and Communications October 2016 Performance Analysis/Study of OFDM Based DVB-T System under AWGN, Rayleigh and Rician Channels Syed Gilani Pasha 1 Vinayadatt

More information

Receiver Design for Single Carrier Equalization in Fading Domain

Receiver Design for Single Carrier Equalization in Fading Domain 65 International Journal of Computer Science & Management Studies, Vol. 12, Issue 02, April 2012 Receiver Design for Single Carrier Equalization in Fading Domain Rajesh Kumar 1, Amit 2, Priyanka Jangra

More information

DOPPLER PHENOMENON ON OFDM AND MC-CDMA SYSTEMS

DOPPLER PHENOMENON ON OFDM AND MC-CDMA SYSTEMS DOPPLER PHENOMENON ON OFDM AND MC-CDMA SYSTEMS Dr.G.Srinivasarao Faculty of Information Technology Department, GITAM UNIVERSITY,VISAKHAPATNAM --------------------------------------------------------------------------------------------------------------------------------

More information

A Low-Complexity Joint Time Synchronization and Channel Estimation Scheme for Orthogonal Frequency Division Multiplexing Systems

A Low-Complexity Joint Time Synchronization and Channel Estimation Scheme for Orthogonal Frequency Division Multiplexing Systems A Low-Complexity Joint Time Synchronization and Channel Estimation Scheme for Orthogonal Frequency Division Multiplexing Systems Chin-Liang Wang Department of Electrical Engineering and Institute of Communications

More information

Broadband OFDM-FDMA System for the Uplink of a Wireless LAN

Broadband OFDM-FDMA System for the Uplink of a Wireless LAN Broadband OFDM-FDMA System for the Uplink of a Wireless LAN Dirk Galda and Hermann Rohling Department of Telecommunications,TU of Hamburg-Harburg Eißendorfer Straße 40, 21073 Hamburg, Germany Elena Costa,

More information

ULTRA-WIDEBAND (UWB) communication systems

ULTRA-WIDEBAND (UWB) communication systems IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 55, NO. 9, SEPTEMBER 2007 1667 Narrowband Interference Avoidance in OFDM-Based UWB Communication Systems Dimitrie C. Popescu, Senior Member, IEEE, and Prasad Yaddanapudi,

More information

Iterative Detection and Decoding with PIC Algorithm for MIMO-OFDM Systems

Iterative Detection and Decoding with PIC Algorithm for MIMO-OFDM Systems , 2009, 5, 351-356 doi:10.4236/ijcns.2009.25038 Published Online August 2009 (http://www.scirp.org/journal/ijcns/). Iterative Detection and Decoding with PIC Algorithm for MIMO-OFDM Systems Zhongpeng WANG

More information

A Study on the Enhanced Detection Method Considering the Channel Response in OFDM Based WLAN

A Study on the Enhanced Detection Method Considering the Channel Response in OFDM Based WLAN A Study on the Enhanced Detection Method Considering the Channel Response in OFDM Based WLAN Hyoung-Goo Jeon 1, Hyun Lee 2, Won-Chul Choi 2, Hyun-Seo Oh 2, and Kyoung-Rok Cho 3 1 Dong Eui University, Busan,

More information

Implementation of Different Interleaving Techniques for Performance Evaluation of CDMA System

Implementation of Different Interleaving Techniques for Performance Evaluation of CDMA System Implementation of Different Interleaving Techniques for Performance Evaluation of CDMA System Anshu Aggarwal 1 and Vikas Mittal 2 1 Anshu Aggarwal is student of M.Tech. in the Department of Electronics

More information