Abstract
Proposed is a simplified branch metric calculation method for the (quasi-)maximum-likelihood (ML) detector for square quadrature amplitude modulation (S-QAM) aided multiple-input and multiple-output (MIMO) multiplexing systems while retaining identical performance to the respective one. The key idea of the proposed method is to exploit the geometric property of the S-QAM constellation, so that the branch metric calculation for all the constellation points can be calculated in an incremental way from any constellation point mainly through addition and bit-shift, thus significantly reducing the computational complexity of the ML detector.
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