摘要
基于对频率非选择性Rayleigh衰落信道中采用ORC(orthogonality restoring combining)技术的MC-CDMA系统误码率下边界的分析,提出了忽略最弱子载波(信道衰减系数最小的子载波)的改进ORC检测方案。仿真结果表明,该方案比传统ORC在性能上有很大提高,比较接近MMSEC技术;如果忽略过多的弱子载波反而会影响用户间扩频码的正交性,引起系统性能恶化。改进方案具有随子载波数线性增长的运算复杂度,是一种比较实用的MC-CDMA系统检测技术。
Based on the analysis of bit-err rate（BER） upper hound for ORC technique of MC-CDMA systems in the frequency unselective channel, an improved ORC scheme that omits the weakest subcarrier（ the subearrier with the smallest channel tading 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.
出处
《无线电通信技术》
2006年第2期23-25,共3页
Radio Communications Technology
