密集多径信道中最优S-Rake路径选择与算法

Optimal Path Selection and Algorithm for S-Rake in Dense Multipath Channels

研究了存在径间干扰的准静态密集多径信道中S-Rake(选择式Rake)路径选择问题.以系统误比特概率为目标代价函数,经过理论推导,将路径选择问题转化为一个以S-Rake径数为约束条件的最优化问题.给出了密集多径信道中的路径选择最优化准则和简化的次最优路径选择算法.数值仿真结果表明,在存在径间干扰的准静态密集多径信道中,所提的次最优路径选择算法优于传统的基于瞬时信噪比排序的路径选择算法.

The path selection issue for S-Rake （selective Rake） in quasi-static dense multipath channels with inter-path interference is investigated. The bit error probability is taken as the objective cost function. After some theoretic derivation, the path selection issue is converted into a constrained optimization problem conditioned on the number of path employed in S-Rake. The optimal path selection criterion is presented and a suboptimal algorithm is proposed. The numerical simulations indicate that, in quasi-static dense multi-path channels with inter-path interference, the proposed path selection algorithm outperforms the conventional algorithm based on instantaneous signal to noise ratio ordering.