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Performance analysis of M-ary DS-CDMA systems with imperfect power control

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1 Author(s)
Chiang, C.-T. ; Dept. of Electr. Eng., I-Shou Univ., Kaohsiung, Taiwan

The system performance of an M-ary DS-CDMA system is investigated for a coherent reception of uplink signals. In addition, the effect of imperfect power control resulting in a lognormal distribution of signal power on the system performance is also considered. A theoretical expression for the bit error rate (BER) performance of M-ary DS-CDMA systems with imperfect power control is achieved. The results show that the M-ary orthogonal modulation can offer performance improvement in terms of BER and capacity, even under imperfect power control. However, the advantage of M-ary technology is almost lost due to bad power control, even increasing the M value. For a specified performance, the derived results can be used as guides in evaluating the required quality of power control for an M-ary DS-CDMA system. Simulation results verify the theoretical derivations.

Published in:

Communications, IEE Proceedings-  (Volume:151 ,  Issue: 6 )

Date of Publication:

24 Dec. 2004

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