MIMO系统中基于加权公平队列的空间复用多用户接入调度算法

Spatial multiplexing multiuser access(SMMA) scheduling algorithm based on weight fair queuing(WFQ) for MIMO system

多入多出(MIMO)系统利用多个发射和接收天线可以取得空间复用的效果.传统的加权公平队列WFQ虽然给每个用户提供了公平的接入信道机会,但是并没有利用MIMO系统空间复用的优点,系统容量并没有得到改善.针对这个问题,提出了一种新的基于加权公平队列的空间复用多用户接入SMMA调度算法,将上层的公平调度策略和物理层的优化天线分配相结合.最后通过仿真,将传统的WFQ算法和基于WFQ的空间复用多用户接入调度算法进行比较.仿真结果证明SMMA-WFQ算法不但给每个用户提供了公平的接入信道机会,而且提高了系统容量.

MIMO systems can gain the benefit of spatial multiplexing by using multiple transmit and receiving antennas. Conventional weighted fair queuing （WFQ） doesn＇t take advantage of the benefits of spatial multiplexing of MIMO systems and the system capacity isn＇t improved, although it does provide fair channel access chance to users. A novel spatial multiplexing multiuser access （SMMA） scheduling algorithm based on weighted fair queuing for MIMO system is proposed to solve this problem. The SMMA-WFQ combines the fair scheduling strategy at the upper layer with optimal antenna assignment at the physical layer. Computer simulations were conducted to compare conventional WFQ and SMMA-WFQ. Simulation results show that the SMMA-WFQ algorithm provides fair channel access to users and also improves system capacity.