MIMO-OFDM系统中自适应功率分配的算法性能分析

为了提高系统容量和性能,人们对MIMO技术、OFDM技术以及自适应传输技术展开了广泛的研究.本文在已知信道状态信息的前提下,将MIMO和OFDM技术相结合,提出了一种新的MIMO-OFDM系统的功率分配和自适应调制方法.该方法采用注水定理,在发送端天线的平均功率受限的条件下,按照信道传输矩阵的奇异值对发送端的多天线进行最优功率分配和自适应MQAM调制.目标是在平均功率约束条件下最优化传输速率.仿真结果表明,该方法实现简单,与平均分配功率算法相比,在性能上有很大提高.

Performance analysis of adaptive power allocation algorithm in MIMO-OFDM system

To improve system capacity and performance, MIMO, OFDM and adaptive transmission technology are broadly researched. In this paper, a novel power allocation and adaptive modulation method is proposed on the basis of the combination of MIMO and OFDM technology. According to the water injection theory, the optimal power allocation of multi-antenna and adaptive MQAM modulation was made in accordance with the value of signal channel transmission matrix. The purpose is to optimize transmission speed under the restrain condition of average power. Simulation result indicated that the method is easy to implement and improve the performance when compared with average allocation algorithm.