An improved ORC technique of MC-CDMA systems
Ming Li · Radio and communications technology · 2006
Based on the analysis of bit-err rate(BER) upper bound for ORC technique of MC-CDMA systems in the frequency unselective channel, an improved ORC scheme that omits the weakest subcarrier(the subcarrier with the smallest channel fading factor) is proposed. Simulation results show that, the new scheme has a better performance than conventional ORC, and is very close to MMSEC; Truncating more than one weak subcarriers will affect the orthogonality of different users’ spread codes, resulting in performance degradation. The improved scheme has a linear computing complexity with the rising of the number of subcarriers, so it is a very practical detection technique for MC-CDMA systems.