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Previous work described that the improvements in spectral efficiency and link reliability can be obtained in wireless relay networks employing terminals with MIMO capability. In order to take the advantage of MIMO relay networks while mitigate the complexity of decoding procedure, the authors propose a scheme that applies ZF relaying at the relay terminals and utilizes MMSE V-BLAST receiver at the destination terminal for two-hop half-duplex coherent MIMO relay networks. Considering the channel estimation is often imperfect due to the noise and interference, this paper extends the V-BLAST receiver design to the imperfect Channel State Information (CSI), assuming the channel estimation errors are independent complex Gaussian with zero mean and known second-order statistics.
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