Superimposed Training-Based Channel Estimation for MIMO Relay Networks
Superimposed Training-Based Channel Estimation for MIMO Relay Networks
复制标题
基于叠加训练的 MIMO 中继网络信道估计
DOI:
10.1155/2012/698748
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发表时间:
2012-09
影响因子:
1.5
通讯作者:
Xiang, Haige1
中科院分区:
文献类型:
--
作者:
Xu, Xiaoyan1;Wu, Jianjun1;Ren, Shubo1;Song, Lingyang1;Xiang, Haige1
We introduce the superimposed training strategy into the multiple-input multiple-output (MIMO) amplify-and-forward (AF) one-way relay network (OWRN) to perform the individual channel estimation at the destination. Through the superposition of a group of additional training vectors at the relay subject to power allocation, the separated estimates of the source-relay and relay-destination channels can be obtained directly at the destination, and the accordance with the two-hop AF strategy can be guaranteed at the same time. The closed-form Bayesian Cramer-Rao lower bound (CRLB) is derived for the estimation of two sets of flat-fading MIMO channel under random channel parameters and further exploited to design the optimal training vectors. A specific suboptimal channel estimation algorithm is applied in the MIMO AF OWRN using the optimal training sequences, and the normalized mean square error performance for the estimation is provided to verify the Bayesian CRLB results.
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