On the Performance of COFDM System

Nasir Al-Awad, Muaayed Al-Rawi


This paper studies the performance of coded orthogonal frequency division multiplexing system using two modulation techniques, quadrature phase shift keying (QPSK) and M-ary quadrature amplitude modulation(M-QAM) with M=8, 16, 32, and 64. The convolutional code is used as error-correcting-code. The communication channel used is vehicular channel with Additive White Gaussian Noise(AWGN). Simulation results show that the performance of  coded orthogonal frequency division multiplexing system is better than that with un-coded one for QPSK and M-QAM. Also, the performance of the system with QPSK is better than that with M-QAM. Furthermore, the performance degrades as M increases.

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J. Bingham, “Multicarrier Modulation for Data Transmission: An Idea Whose Time Has Come,” IEEE Commun. Mag., vol. 2, no. 5, May, 1990, pp. 5–14.

B. LeFloch, M. Alard, and C. Berrou “Coded Orthogonal Frequency Division Multiplex,” Proc. IEEE, vol. 83, June, 1995, pp. 982–96.

B. Stephen, “History of OFDM,” IEEE Commun. Mag.,vol. 47, no. 11,Nov., 2009, pp. 26–35.

V. Sharma, “BER performance of OFDM-BPSK,-QPSK,- QAM over AWGN channel using forward Error correcting code,” International Journal of Engineering Research and Applications, vol. 2, issue 3, 2012, pp.1619-1624.

Y. Khan, “To Improve Performance of OFDM System Using Optimize Adaptive Coding Technique with Convolutional and BCH Coding,” International Journal of Application or Innovation in Engineering & Management, vol. 3, issue 5, May 2014.

B. Alex,“Behavior and Techniques for Improving Performance of OFDM Systems for Wireless communications,” International Journal of Advanced Research in Computer and Communication Engineering vol. 4, issue 1, January 2015.

Sachin, “Analyzing the BER Performance of OFDM-System with QPSK and BPSK Modulation Technique,” International Journal of Innovative Research in Advanced Engineering, vol. 2. no.6, 2015.

B. Lu, X. Wang, and K. R. Narayanan, “LDPC-based space-time coded OFDMsystems over correlated fading channels: Performance analysis and receiver design,” IEEE Trans. Wireless Commun., vol. 1, pp. 213-225, 2002.

H. Kim, "Turbo coded orthogonal frequency division multiplexing for digitalaudio broadcasting," in 2000 IEEE Intern. Confer. on Commun., vol. 1, pp. 420-424.

E. Malkamaki and H. Leib, " Coded diversity on block-fading channels," IEEE Trans. Inform. Theory, vol. 45, pp. 771-781, 1999.

R. G. Gallager, Information Theory and Reliable communication. New York, Wiley, 1968.

S. Arimoto, "On the converse to the coding theorem for discrete memoryless channels," IEEE Personal Commun., vol. IT-19, pp. 357-359, 1973.


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