DocumentCode :
771136
Title :
Low complexity detection of high-order modulations in multiple antenna systems
Author :
Claussen, H. ; Karimi, H.R. ; Mulgrew, B.
Author_Institution :
Bell Labs., Swindon, UK
Volume :
152
Issue :
6
fYear :
2005
Firstpage :
789
Lastpage :
796
Abstract :
Mobile receiver complexity persists as one of the key areas of concern in the adoption of MIMO technologies for systems such as high-speed downlink packet access in UMTS. This is particularly the case for high-order modulation schemes such as 16- and 64-QAM, where optimum a posteriori probability detection becomes too complex, and sub-optimal detection based on serial or parallel interference cancellation performs poorly. The above issues are successfully tackled by introducing a judicious layered encoding process at the transmitter which, once appropriately exploited at the receiver, allows considerable reductions in computational complexity in addition to improvements in performance. Also, the applicability of high-order modulations with layered encoding is investigated using system-level simulations for a 2-cell and a 7-cell urban scenario. It is shown that high-order modulations can be used in a substantial area of the cell for both investigated scenarios.
Keywords :
MIMO systems; antenna arrays; cellular radio; computational complexity; interference suppression; maximum likelihood detection; mobile antennas; modulation coding; probability; radio receivers; radio transmitters; receiving antennas; transmitting antennas; 2-cell urban scenario; 7-cell urban scenario; MIMO technology; a posteriori probability; computational complexity; high-order modulation scheme; layered encoding process; mobile receiver complexity; multiple antenna system; multiple input multiple output system; optimum APP detection; parallel interference cancellation; radio transmitter; serial interference cancellation; suboptimal detection; system-level simulation;
fLanguage :
English
Journal_Title :
Communications, IEE Proceedings-
Publisher :
iet
ISSN :
1350-2425
Type :
jour
DOI :
10.1049/ip-com:20045222
Filename :
1561953
Link To Document :
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