Abstract
Latest communications standards have incorporated wireless multi-input multi-output (MIMO) systems combining the use of space-time coding (STC) and spatial multiplexing (SM) techniques. One of the challenges of such space-time coded multiplexing (STCM) systems is the design of high performance and low complexity detectors at large MIMO dimensions, where existing group-based and direct detection detectors suffer from either performance degradation or high computational cost. In this paper, we present pairwise element-based lattice reduction (ELR)-aided detectors for the STCM systems. By utilizing the symmetric structure of the equivalent channel matrix, the proposed pairwise ELR (PELR)-aided detectors approximately halve the complexity of the original ELR-aided detectors while keeping similar bit-error-rate (BER) performance. They also have a lower BER and similar complexity compared to other state-of-the-art detectors. We demonstrate the better tradeoff between the BER and complexity of our PELR-aided detectors under large MIMO systems with simulations.
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