摘要
对无线网络,使用波束形成技术可以提高系统性能,机会波束形成技术通过随机发射权重向量能够充分利用无线通信网络中固有的多用户分集,提高系统吞吐量,但是在少用户的时候由于找不到匹配的用户,它的性能下降很快。相干机会波束形成在少用户的时候能够提高系统性能,但随着时延的增加系统性能又会降低,本文结合权重估计方法和相干机会波束形成方法,在性能提高的基础上解决了相干机会波束形成的时延问题,仿真结果表明该方法是有效的。
In wireless networks,beamforming technique can improve system performance.Opportunistic beamforming takes full advantage of multi-user diversity by randomly generating weight vectors,which increases system throughput.But in a small user environment,its performance declines rapidly because it cannot find the matched users.The coherent opportunistic beamforming can improve system performance in a small user environment,however,system performance will decrease due to the increase of time delay.In this paper,combining the weight estimation method and the coherent opportunistic beamforming method,we solve the time delay issues of coherent opportunistic beamforming with a better system performance,the simulations verify the effectiveness of the proposed method.
出处
《西安邮电学院学报》
2010年第1期77-81,共5页
Journal of Xi'an Institute of Posts and Telecommunications
关键词
机会波束形成
权重向量
多用户分集
吞吐量
opportunistic beamforming
weight vector
multi-user diversity
throughput
