一种蜂窝系统基站协作干扰抑制方法

Kind of Interference Suppression for Cellular System Using Base-station Cooperation

基站协作可有效抑制相邻小区用户间的干扰。设计了一种利用基站协作进行干扰抑制的方法。在所有协作基站中选择一个作为主基站,每个基站使用干扰消除,解调出所有超过信噪比门限的用户信号,并将剩余信号发送给主基站,主基站将来自协作基站的剩余信号与本地的剩余信号合并后再做一次干扰消除。第一次干扰消除有效区分了强弱信号,将弱信号在主基站处的合并可以引入路径分集增益,再次采用干扰消除可有效地检测出较弱的信号,最终达到干扰抑制的目的。

Interference from other cells can be treated efficiently by base-station cooperation. A kind of interference suppression using base-station cooperation is introduced. A central base-station is chosen from all the cooperative base-stations. User signals higher than SNR threshold are demodulated using interference cancellation by each station, and residual signals are sent to the central base-station. Local residual signals are combined with those from other cooperative base-stations by the central base-station, and interference cancellation is used again. Strong signals and weak signals are efficiently distinguished by the first interference cancellation, and diversity can be induced by the combination at the central base-station, then interference cancellation is used again in order to efficiently detect weak signals, so the aim of interference suppression can be achieved at last.