多用户MIMO系统中基于快速匹配调度的有限反馈SDMA

摘要

提出了一种能高效利用多用户分集和空分复用增益的有限反馈空分多址(SDMA,space division multiple access)方法.首先利用子空间扰动的方法构造了一种具有分簇结构的多用户预编码码本.基于该码本,进一步给出了一种新型的多用户机会调度算法,该算法利用码本的簇结构实现对信道条件匹配的用户组进行快速的机会调度,同时确定被调度用户的首选码字.仿真结果表明,在蜂窝网络中,与传统的有限反馈SDMA方法相比,所提方法可以在不明显增加反馈开销的前提下显著提高系统吞吐量.%A limited feedback SDMA (space division multiple access) scheme was proposed by constructing a new codebook and developing a related opportunistic scheduling algorithm. In particular, an SDMA codebook was first devised,which had a cluster-based structure and was generated by using a subspace perturbation method. Then, a novel opportunistic scheduling algorithm was proposed to exploit the cluster structure of the devised codebook. The algorithm was capable of rapidly finding a group of channel-matching users together with their preferred precoders. Simulation results demonstrate that in cellular networks, the proposed SDMA scheme outperforms conventional limited feedback SDMA schemes in terms of throughput, with a comparable feedback overhead.