Prototype Implementation of Real-Time ML Detectors for Spatial Multiplexing Transmission

Toshiaki KOIKE  Yukinaga SEKI  Hidekazu MURATA  Susumu YOSHIDA  Kiyomichi ARAKI  

IEICE TRANSACTIONS on Communications   Vol.E89-B   No.3   pp.845-852
Publication Date: 2006/03/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.3.845
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
multiple-input multiple-output (MIMO),  spatial multiplexing,  maximum-likelihood detection (MLD),  field programmable gate array (FPGA),  real-time MIMO detector,  

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We developed two types of practical maximum-likelihood detectors (MLD) for multiple-input multiple-output (MIMO) systems, using a field programmable gate array (FPGA) device. For implementations, we introduced two simplified metrics called a Manhattan metric and a correlation metric. Using the Manhattan metric, the detector needs no multiplication operations, at the cost of a slight performance degradation within 1 dB. Using the correlation metric, the MIMO-MLD can significantly reduce the complexity in both multiplications and additions without any performance degradation. This paper demonstrates the bit-error-rate performance of these MLD prototypes at a 1 Gbps-order real-time processing speed, through the use of an all-digital baseband 44 MIMO testbed integrated on the same FPGA chip.