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5250
Performance Analysis of QS-CDMA Systems
Abstract:
In the paper, the performance of quasi-synchronous CDMA (QS-CDMA) system, which can allow an increased timing error in synchronized access, is discussed. Average BER performance of the system is analyzed in the condition of different access timing error and different asynchronous users by simulation in AWGN channel. The results show that QS-CDMA system is shown to have great performance gain over the asynchronous system when access timing error is within a few chips and asynchronous users is tolerable. However, with access timing error increasing and asynchronous users increasing, the performance of QS-CDMA will degrade. Also, we can determine the number of tolerable asynchronous users for different access timing error by simulation figures.
Digital Object Identifier (DOI):

References:

[1] C.Onan, O. Kucur, and E. Ozturk, "Performance of quasi-synchronous scale-time-code division multiple access system over the additive white Gaussian noise channel", IEEE Signal Processing and Communications Applications Conference, pp.708-711, April 2004.
[2] A. Kuramoto, T. Abrao, and P. J. Jeszensky. "Sets of sequences for QS-CDMA systems with interference cancellation over multipath Rayleigh fading channels", IEEE Eighth International Symposium on Spread Spectrum Techniques and Applications, pp.694-698, Sep. 2004.
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[5] F. Pingzhi, "New direction in spreading sequence design and the related theoretical bounds", IEEE International Conference on Communications, Circuits and Systems and West Sino Expositions, Vol.1, pp. xliii - xlviii, July 2002
[6] S. H. Duan. "Researches on Quasi-Synchronous CDMA and Its Application in Mobile Satellite Communication System". Harbin Industry University, 2001.
[7] L. Biqi; Z. Ping, H.Jiandong, "A generalized QS-CDMA system and the design of new spreading codes", IEEE Trans.on VTC, Vol. 47, pp.12687- 1275, Nov.1998
[8] S. Stanczak, A. Feistel, "Dynamic resource allocation for frequency-selective orthogonal QS-CDMA channels", IEEE Conference on Signals, Systems and Computers, Vol. 1, pp.632-636.2004
[9] J. K. Kyeong, R. A. Iltis, "Block coded modulation for the QS-CDMA system", IEEE Conference on Signals, Systems and Computers, Vol. 1, pp.9-12, Nov. 2003
[10] D. V. Sarwate, "Mean-Square Correlation of Shift-Register Sequence", IEE Proceedings.1984,131(2):101-106.
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