改进的基于QoS的有限反馈多用户调度算法

Improved Scheduling Scheme for Multiuser System with Limited Feedback Based on QoS

在有限反馈多入多出系统中,传统的多用户调度算法考虑了系统的和速率,但忽视了各用户的服务质量需求,尤其是速率下限需求。该文提出了一种改进算法,综合考虑系统的和速率与各用户的速率下限需求,不满足速率下限需求的用户暂不进行通信。仿真结果表明,改进算法的系统和速率会有所降低,但在信噪比较低时与传统算法的和速率差距很小,而随着信噪比增加和速率差距趋于稳定;同时,由于系统不再受到不满足速率下限需求用户的干扰,其误码性能会有较大提高。因此,该算法实现了系统和速率与通信用户性能的较好折衷。

In the multiple-input multiple-output（MIMO） system with limited feedback, traditional multiuser scheduling algorithm only considers the sum rate, and the requirement for quality of serviee（QoS）, especially the strain rate, is always neglected. An improved scheme is proposed considering the sum rate and the strain rate. Users under strain rate temporarily stop communicating. Simulation results show that the sum rate decreases and the difference between the traditional and the improved algorithms is small in lower SNR and tends to be stable with increasing SNR. Meanwhile, bit error rate performance of communicating users is improved greatly because users under the strain rate cannot disturb the system any more. Therefore, the scheme behaves well in system sum rate and performance.