Low-Complexity MIMO Demodulator with Quasi-optimal Error Rate Performance

This paper proposes a multiple-input multiple-output (MIMO) demodulating technique based on QR-decomposition, that is able to achieve a quasi-optimal Bit-Error Rate (BER) performance while requiring a polynomial computational effort of the same order as Linear demodulators. The proposed algorithm offers a flexible trade-off between arithmetic complexity and noise immunity by fine-tuning the algorithm parameters to meet the desired characteristics. The complexity of the proposed algorithm, as well as the simulation results of BER performance, are demonstrated in multiple MIMO scenarios and compared with other conventional demodulators.