Lattice Reduction-Aided MIMO Detectors under Correlated Channels

In this contribution, lattice reduction (LR) technique is applied to improve the MIMO detector performance under correlated channel constrains. Zero-forcing, minimum mean squared error (MMSE), ordered successive interference cancellation (OSIC) and sphere decoding (SD) detectors are analysed taking into consideration a) different correlated fading channel indexes, and b) increasing spectral efficiency, by combining number of transmit antennas and modulation formats. Analyses of correlated channel effects over the performance of MIMO systems equipped with different LR-aided detectors are carried out, indicating the robustness of those detectors, as well as the SD-MIMO detector deficiency to deal with such large number of strongly correlated MIMO channel condition. Besides, computational complexities are compared aiming to determine the best LR-MIMO detection scheme under the perspective of performance-complexity tradeoff