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Fixed Point Realization of Iterative LR-Aided Soft MIMO Decoding Algorithm
Mehnaz Rahman, Gwan S. Choi · 2015-04-01 · via cs.IT updates on arXiv.org

Multiple-input multiple-output (MIMO) systems have been widely acclaimed in order to provide high data rates. Recently Lattice Reduction (LR) aided detectors have been proposed to achieve near Maximum Likelihood (ML) performance with low complexity. In this paper, we develop the fixed point design of an iterative soft decision based LR-aided K-best decoder, which reduces the complexity of existing sphere decoder. A simulation based word-length optimization is presented for physical implementation of the K-best decoder. Simulations show that the fixed point result of 16 bit precision can keep bit error rate (BER) degradation within 0.3 dB for 8x8 MIMO systems with different modulation schemes.

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