DocumentCode :
1755531
Title :
A Constellation Scaling Approach to Vector Perturbation for Adaptive Modulation in MU-MIMO
Author :
Ang Li ; Masouros, Christos
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. Coll. London, London, UK
Volume :
4
Issue :
3
fYear :
2015
fDate :
42156
Firstpage :
289
Lastpage :
292
Abstract :
It is known that vector perturbation (VP) precoding does not apply to the case where users employ different modulations, while existing solutions for this scenario are suboptimal. In this letter, a joint vector perturbation precoding algorithm is proposed for multiuser MIMO (MU-MIMO) downlink system in the adaptive modulation scenario where different users apply different modulation types. Compared with conventional block diagonalized vector perturbation (BD-VP) and user grouping VP where the search dimension of the perturbation vector is reduced, the proposed algorithm keeps the search dimension unchanged by applying a simple transformation to the VP operation. Our analysis and results show that the proposed algorithm provides an applicable VP solution to the adaptive modulation scenario, with optimal VP performance.
Keywords :
MIMO communication; adaptive modulation; precoding; search problems; MU-MIMO downlink system; adaptive modulation scenario; constellation scaling approach; joint vector perturbation precoding algorithm; search dimension; Bit error rate; Complexity theory; Joints; MIMO; Phase shift keying; Vectors; MIMO; adaptive modulation; joint perturbation; precoding; vector perturbation;
fLanguage :
English
Journal_Title :
Wireless Communications Letters, IEEE
Publisher :
ieee
ISSN :
2162-2337
Type :
jour
DOI :
10.1109/LWC.2015.2410271
Filename :
7055321
Link To Document :
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