Title :
VLSI architecture of the soft-output sphere decoder for MIMO systems
Author :
Guo, Zhan ; Nilsson, Peter
Author_Institution :
Dept. of Electrosci., Lund Univ., Sweden
Abstract :
Sphere decoders can approach the performance of maximum-likelihood (ML) decoders for MIMO systems with lower complexity. In this paper, VLSI architecture of the modified K-best Schnorr-Euchner (MKSE) sphere decoder is proposed for soft-output MIMO decoding. The MKSE decoder can achieve near-ML performance with higher decoding throughput and lower computational complexity. The proposed VLSI architecture is implemented for a 4 × 4 16-QAM MIMO system in a 0.13-μm CMOS technology. The implemented soft-output MKSE chip can achieve a decoding throughput of more than 100 Mb/s with a 0.56 mm2 core area and 97 K gates.
Keywords :
MIMO systems; VLSI; maximum likelihood decoding; quadrature amplitude modulation; 0.13 micron; 16-QAM MIMO system; CMOS technology; MKSE decoder; VLSI architecture; computational complexity; decoding throughput; maximum-likelihood decoders; modified K-best Schnorr-Euchner decoder; near-ML performance; soft-output sphere decoder; CMOS technology; Computational complexity; Computer architecture; Detectors; Iterative decoding; MIMO; Maximum likelihood decoding; Maximum likelihood detection; Throughput; Very large scale integration;
Conference_Titel :
Circuits and Systems, 2005. 48th Midwest Symposium on
Print_ISBN :
0-7803-9197-7
DOI :
10.1109/MWSCAS.2005.1594321