Title :
A fast exact ML sphere decoder with efficient two-layer enumeration
Author :
Weiyu Xu ; Youzheng Wan ; Jing Wang
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
Sphere decoders have gained attention for low-complexity optimum signal detection in multiple-input multiple output (MIMO) wireless systems. In this paper, a new faster sphere decoder by employing two-layer enumeration (TLE-SD) is proposed for exact ML detection in MIMO systems. In TLE-SD, search radius shrinks to the Euclidean distance between received vector and closest lattice point very fast by utilizing the larger diversity order provided by the proposed two-layer enumeration. Theoretical analysis and simulation results show that TLE-SD leads to considerable computation complexity reduction compared with other sphere decoders.
Keywords :
MIMO systems; diversity reception; maximum likelihood decoding; maximum likelihood detection; search problems; Euclidean distance; MIMO wireless systems; ML detection; TLE-SD; computation complexity reduction; diversity order; exact ML sphere decoder; multiple-input multiple output systems; optimum signal detection; search radius; two-layer enumeration; Analytical models; Computational modeling; Detectors; Euclidean distance; Lattices; MIMO; Maximum likelihood decoding; Maximum likelihood detection; Receiving antennas; Signal detection;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th
Print_ISBN :
0-7803-8521-7
DOI :
10.1109/VETECF.2004.1400235
