莱斯衰落信道下的干扰抵消均衡器

将干扰抵消(interference cancellation, IC)技术引入莱斯衰落环境中的单载波传输系统,构成一种具有抑制符号间干扰能力的高效均衡器。通过匹配滤波器(match filter, MF)或均衡器对发送信号初始检测,根据检测结果和信道状态信息构建通过各个路径的信号并从接收信号中抵消,只保留接收信号中的主径分量进行最终的解调译码。解调结果也可以用来重新构建多径信号,从而形成多级IC结构,提高检测性能。在SUI5信道模型下的 Monte Carlo仿真结果表明,多级IC均衡器可以明显地提高初始检测的性能;当检测级数相同时,初始检测采用均衡器可以比MF取得更优的性能。

Interference cancellation equalizer in Rician-fading channels

The interference cancellation (IC) technique is brought into the single carrier (SC) transmission systems in Rician fading channels, and an effective equalizer is constituted. The initial estimation of the transmitted data is made by match filter (MF) or common single carrier equalizers, and then every multipath signal is constructed by this initial solution using channel state information. Then final demodulation result is obtained by the line of sight component in the received signal which can be acquired by cancelling the sum of all the other multipath signals from the received signal. The final solution can also be used to construct multipath components, so that the performance is improved further. It is shown by Monte Carlo simulation that the performance of initial detector is improved evidently, and the performance is better with equalizer than MF as the initial detector in the SUI 5 wireless communication link.