【摘要】 本文分析了OFDM通信系统在平坦瑞利多径衰落条件下采用最优合并(OC)空间分集接收算法的QAM调制信号的平均误符号率(SER)。采用在DFT变换前进行分集合并方法,大大减小了计算代价。考虑到同信道干扰(CCI)用户数大于或等于分集接收天线数,对各接收天线的接收信号按照输出最大信干比的原则进行加权合并。给出了平均SER的仿真结果,表明最优合并空间分集算法具有较好的性能。更多还原

【Abstract】 This paper analyzes the performance of average symbol error ratio (SER)of optimum combining for spatial diversity of OFDM system,modulated by M-QAM in flat Rayleigh multipath fading environment.This space diversity scheme which combines the received signals before discrete Fourier transformation greatly reduces the computation cost with small performance degradation.The received signals are weighted and combined to maximize the output signal-to- interference ratio with the number of interferences more than the number of antenna elements.Monte Carlo simulations represent the performance of average SER superior to maximum ratio combining.更多还原