MU-MIMO系统的线性预编码和功率分配算法

The linear precoding and power allocation algorithm in multiuser MIMO system

针对下行链路多用户MIMO系统,提出了一种联合预编码和功率分配的算法.该算法能够优化系统的信道容量,同时也保证了每个用户的服务质量要求.首先求解线性预编码;在此基础上,通过分布式的功率分配,使得在满足各个用户服务质量要求的前提下,信道容量最大化.算法与现有的结合功率分配的预编码策略相比,在达到较高的信道容量的同时,也能满足各用户的最低速率要求(QoS).仿真试验表明:高信噪比(10～20dB)的情况下,在达到相等的信道容量时,算法平均可获得1dB的增益;在低信噪比(0～6dB)的情况下也能满足各用户的QoS要求.

A joint linear preceding and power allocation algorithm based on users＇QoS was proposed for the downlink of multiuser MIMO systems. This algorithm will improve the channel capacity of the muhiuser MIMO system and guarantee different user＇s QoS requirement at the same time. The proposed algorithm can be decomposed as follow, on the basis of the preceding ,the transmit power allocation for different user will be optimized to maximize the channel capacity. The proposed algorithm will not only provide high channel capacity, but also meet the users＇ service requirement compared with the other scheme. The simulation result shows that it will get about ldB gain averagely with the same channel capacity in high SNR region（ 10- 20dB）. The users＇service requirement will also be met in low SNR region. （0 -6dB） .