The value of channel prediction in CoMP systems with large backhaul latency
The value of channel prediction in CoMP systems with large backhaul latency
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DOI：
10.1109/tcomm.2013.091813.130027
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发表时间：
2013-09
期刊：
影响因子：
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通讯作者：
Liyan Su;Chenyang Yang;Shengqian Han
中科院分区：
文献类型：
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作者：
Liyan Su;Chenyang Yang;Shengqian Han
信道状态信息的质量对协调多点（CoMP）系统的性能有很大影响。本文研究了信道预测对具有大回程延迟的时变信道中相干CoMP传输性能的影响。我们借助大系统分析，推导了当预测信道用于下行预编码时CoMP系统平均用户速率的显式表达式。通过与非CoMP系统的比较，我们发现CoMP系统在信道估计方面具有更高的性能增益。因此，如果使用信道预测而不是信道估计，即使在较大的回程延迟下，CoMP系统也可以为移动用户提供良好的性能。仿真结果验证了我们的分析。
The quality of channel state information (CSI) has large impact on the performance of coordinated multi-point (CoMP) systems. In this paper we study the impact of channel prediction on the performance of coherent CoMP transmission in time-varying channels with large backhaul latency. We resort to large system analysis to derive an explicit expression of the average user rate of the CoMP system when predicted channels are employed for downlink precoding. By comparing with the Non-CoMP systems, we find that channel prediction brings much higher performance gain to CoMP systems with respect to channel estimation. As a result, a CoMP system can perform well for mobile users even under large backhaul latency, if channel prediction will be used instead of channel estimation. Simulation results are provided to validate our analysis.