摘要
针对时分导频位ＣＤＭＡ系统上行链路，本文提出了导频位输助ＬＭＳ－ＤＲＭＴＡ算法加上部分多址干扰对消的空时联合干扰抑制接收方案。由于阵列的干扰抑制作用，其输出信号中只剩下少量强的多址干扰信号。部分干扰对消法只对阵列输出中的强多址干扰信号进行干扰估计并抑制，这样一方面大大降低了系统处理的运算量及缓存空间，另一方面又消除了因弱多址干扰估计的不准确而造成的系统性能下降，并且相对于自适应全多址干扰对消有更好的系统稳定性。仿真实验表明该方案比全干扰用户对消法具有更好的干扰抑制效果。
A space-temporal interference cancellation scheme is proposed which includes the pilot bits assisted LMS-DRMTA algorithm followed by partial multiple access interference(MAI) cancellation to cancel the MAI of the uplink of time multiplexed pilot bits CDMA system. Because of the interference cancellation effect of adaptive array, there are only very few strong MAI signals which must have very close DOA to the desired signal left in the array output. Therefore, the proposed scheme only estimates the strong MAI signals and cancels them from the array processing output. The new scheme is characterized by the following items: First, it cuts down the system complexity and buffering memory. Second, it avoids the degrade of system performance because of inaccurate estimation of the weak MAX signals. Third, it has more robustness than the adaptive parallel interference cancella- tion(PIC) .The simulations indicate that the new scheme performs much better than the adaptive PIC for all of the MAI signals.
出处
《通信学报》
EI
CSCD
北大核心
2001年第10期6-13,共8页
Journal on Communications
基金
国防科技预研基金资助项目
中兴通信基金资助项目
