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Reduced Complexity K-Best Decoder via Adaptive Symbol Constellation for Uncoded MIMO Wireless Systems
Juan Francisco CASTILLO-LEON Marco CARDENAS-JUAREZ Victor M. GARCIA-MOLLA Enrique STEVENS-NAVARRO Ulises PINEDA-RICO
IEICE TRANSACTIONS on Communications
Publication Date: 2017/02/01
Online ISSN: 1745-1345
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
K-Best decoder, MIMO wireless communications, maximum likelihood, complexity,
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In this paper, we present a low and variable computation complexity decoder based on K-Best for uncoded detection in spatially multiplexed MIMO systems. In the variable complexity K-Best (VKB), the detection of each symbol is carried out using only a symbol constellation of variable size. This symbol constellation is obtained by considering the channel properties and a given target SNR. Simulations show that the proposed technique almost matches the performance of the original K-Best decoder. Moreover, it is able to reduce the average computation complexity by at least 75% in terms of the number of visited nodes.