TDD-CDMA系统前向链路的邻小区干扰消除研究

Investigation on Adjacent Cell Interference Cancellation in Forward Link of TDD-CDMA System

在邻小区干扰研究的基础上,提出了一种时分双工-码分多址系统消除干扰的方法———串行干扰消除(SIC)-联合检测(JD)方法,用于前向链路的邻小区强干扰和小区内多址干扰的消除.首先确定邻小区强干扰用户的基本训练序列码,估计其信道特性,并确定其采用的信道化码和扰码;然后采用串行干扰消除对邻小区强干扰进行消除,对小区内多址干扰、码间干扰和剩余的邻小区干扰采用联合检测方法进行消除.仿真结果表明,此方法能有效消除前向链路的邻小区干扰.

Investigated on adjacent cell interference, an interference cancellation scheme was proposed. The method combines serial interference cancellation （SIC） and joint detection （JD）. In the forward link of time division duplex-code division multiple access （TDD-CDMA） system, the basic sequence of severe interfering users of adjacent cell were judged firstly, then the channel impulse responses were estimated and the spread code of such users were judged. Afterwards, the strong adjacent cell interference （ACI） was cancelled using SIC, multiple access interference （MAI）, inter symbol interference （ISI） and the residual ACI are eliminated by JD. Simulation results show that this scheme cancel ACI of forward link efficiently.