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Transmit Precoding for Flat-Fading MIMO Multiuser Systems With Maximum Ratio Combining Receivers

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2 Author(s)
Coskun, A. ; Appl. DSP & VLSI Res. Group (ADVRG), Univ. of Westminster, London, UK ; Candan, C.

We examine the application of transmit precoding in multiuser multi-input-multi-output (MIMO) communication systems with maximum ratio combining (MRC) receivers. In many multiuser applications, the maximum-likelihood or minimum mean-square error (MMSE) receivers can be prohibitive to implement due to their high implementation complexity. We examine the performance of the system with simple MRC receivers and carefully selected precoders, which are designed to compensate the lack of high-complexity receivers, at the transmitter side. We examine the sum MSE minimization and signal-to-interference-plus-noise ratio (SINR) balancing frameworks for the selection of precoders. The performance of two frameworks with MRC receivers are compared between themselves as well as with their counterparts implementing MMSE receivers. It has been observed that the SINR balancing framework with simple MRC receivers has little performance loss in comparison with the MMSE receivers with a proper selection of precoders.

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Vehicular Technology, IEEE Transactions on  (Volume:60 ,  Issue: 2 )