基于用户QoS的MIMO/OFDM系统资源分配研究

Study of the resource allocation in MIMO/OFDM systems based users' QoS

在多用户、多天线环境下的正交频分复用(OFDM)系统中,提出一个低复杂度的自适应资源分配方案。包括自适应子载波分配、功率分配以及波束成型等。目的就是在保障各用户的服务质量要求(QoS)(即包括传输速率和比特误码率(BER)要求)的同时,最小化总的发射功率。利用随机矩阵和排序统计的理论知识,进行详细的性能分析。理论分析和仿真试验都表明,该方案可以有效地保障用户的QoS,并提高系统的整体性能。最后,仿真结果也验证了理论分析的正确性。

A low complexity, adaptive resource allocation scheme for the multiuser MIMO/OFDM system is proposed, which included adaptive subcarrier allocation, power allocation and beamforming, To minimize the total transmit power, and ensure the users＇ QoS requirements at the same time are the research intent. Based on the theory about random matrix and order statistics, a though and exact performance analysis is carried out. Mathematic analysis and simulation examinations all show that the proposed scheme can efficiently improve the system＇s performance and guarantee the users＇ QoS. The analytical results are verified by simulation in the end.