Performance Analysis of Orthogonal Multicarrier-CDMA on Two-Ray Multipath Fading Channels

Sungdon MOON  Gwangzeen KO  Kiseon KIM  

IEICE TRANSACTIONS on Communications   Vol.E84-B    No.1    pp.128-133
Publication Date: 2001/01/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Terrestrial Radio Communications
multicarrier,  multipath,  fading,  BER,  

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Orthogonal Multi-Carrier-Code Division Multiple Access (OMC-CDMA) is a scheme that combines multi-carrier modulation with Direct Sequence Spread Spectrum (DS-SS) and allows the efficient utilization of the bandwidth, the resistance against frequency selective fading in broadband mobile radio channels and the efficient implementation by the FFT algorithm. In this paper, we analyze the bit error probability (BER) of OMC-CDMA on two-ray Rayleigh multipath fading channels with the delay time and compare the BER performances of OMC-CDMA according to the number of users (M) and subcarriers (N), and the power of delayed path. We found that the performance of OMC-CDMA depends greatly on the power of delayed signal. If the power of delayed signal is increased from 10% to 50% as compared with the direct path power, the capacity of OMC-CDMA is decreased approximately by 40% at BER=10-3, N=256 and SNR=12 dB. And, though more subcarriers are used in the circumstance that the power of delayed signal is relatively great, the performance is not significantly improved.