一种改进的MIMO中继系统中比特与功率分配算法

比特和功率分配是基于正交频分复用的多输入多输出(multiple input multiple output-orthogonal frequency division multiplexing,MIMO-OFDM)系统自适应资源分配中的一个重要研究问题.针对单用户MIMO放大转发中继系统中功率分配的问题,提出了基于注水定理的比特和功率分配算法,算法采用对分法搜索注水线,相对于传统的注水算法,减少了迭代次数,复杂度较低.仿真结果表明,该算法能够有效提高系统谱效率,并且在误码率性能上也有一定的提高.

A modified bit and power allocation algorithm for MIMO relay system

Bit and power allocation is an important issue of adaptive resource allocation in MIMO-OFDM system. In this paper, an improved algorithm, bits and power allocation algorithm based on water-filling theorem, is proposed and used to the single-user MIMO amplify and forward relay system. The algorithm which adopts the method of bisection to search water-filling line can reduce the number of literations with low complexity compared with the traditional water-filling algorithm. Simulation results show that system capacity and bit error rate performance can be improved effectively.