Limited feedback beamforming for temporally correlated MIMO channels with other cell interference
Limited feedback beamforming for temporally correlated MIMO channels with other cell interference
复制标题
针对具有其他小区干扰的时间相关 MIMO 信道的有限反馈波束成形
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. Heath
中科院分区：
文献类型：
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作者：
S. Akoum;R. Heath
有限反馈波束成形利用从接收器到发射器的少量反馈来改善链路可靠性。当基站具有有限的协调或没有协调时，这种闭环MIMO系统的性能在干扰受限的蜂窝环境中是未知的。本文建立了由于不协调的其他小区的干扰和延迟的反馈信道上的吞吐量的退化。在马尔可夫信道假设下，本文证明了小区边缘用户的吞吐量增益随时延的增加呈双指数衰减。数值结果表明，当码本大小增加时，衰减率降低。
Limited feedback beamforming improves link reliability with a small amount of feedback from the receiver to the transmitter. The performance of such a closed loop MIMO system is unknown in interference limited cellular environments, when the base stations have limited or no coordination. This paper establishes the degradation in throughput due to uncoordinated other cell interference and delay on the feedback channel. Under a Markov channel assumption, the paper shows that the throughput gain of cell edge users decays doubly exponentially as the delay increases. Numerical results illustrate how the decay rate decreases when the codebook size increases.