Title :
Channel Coded Iterative Center-Shifting K-Best Sphere Detection for Rank-Deficient Systems
Author :
Wang, Li ; Xu, Lei ; Chen, Sheng ; Hanzo, Lajos
Author_Institution :
Sch. of ECS, Southampton Univ., Southampton
Abstract :
Based on an extrinsic information transfer (EXIT) chart assisted receiver design, a low-complexity near-maximum a posteriori (MAP) detector is constructed for high-throughput MIMO systems. A high throughput is achieved by invoking high-order modulation schemes and/or multiple transmit antennas, while employing a novel sphere detector (SD) termed as a center-shifting SD scheme, which updates the SD´s search center during its consecutive iterations with the aid of channel decoder. Two low-complexity iterative center-shifting SD aided receiver architectures are investigated, namely the direct-hard-decision center-shifting (DHDC) and the direct-soft-decision center-shifting (DSDC) schemes. Both of them are capable of attaining a considerable memory and complexity reduction over the conventional SD-aided iterative benchmark receiver. For example, the DSDC scheme reduces the candidate-list-generation-related and extrinsic-LLR-calculation related complexity by a factor of 3.5 and 16, respectively. As a further benefit, the associated memory requirements were also reduced by a factor of 16.
Keywords :
MIMO communication; antenna arrays; channel coding; iterative methods; maximum likelihood estimation; radio receivers; K-best sphere detection; MAP detector; MIMO systems; channel code; chart assisted receiver; direct-hard-decision center-shifting; direct-soft-decision center-shifting; extrinsic information transfer; high-order modulation; iterative benchmark receiver; iterative center-shifting; maximum a posteriori detector; multiple transmit antennas; rank-deficient systems; Broadband antennas; Computational complexity; Detectors; Iterative decoding; MIMO; Maximum likelihood detection; OFDM; Receiving antennas; Throughput; Transmitting antennas;
Conference_Titel :
Vehicular Technology Conference, 2008. VTC 2008-Fall. IEEE 68th
Conference_Location :
Calgary, BC
Print_ISBN :
978-1-4244-1721-6
Electronic_ISBN :
1090-3038
DOI :
10.1109/VETECF.2008.198