Reduced complexity receivers for layered space-time CPM

Layered space-time (LST) transmissions employing continuous phase modulations (CPM) are well motivated for both bandwidth- and power-limited multiantenna communications. However, one of the major challenges for LST-CPM is the high complexity it incurs with maximum likelihood (ML) detection. In this...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2005-03, Vol.4 (2), p.574-582
Main Authors: Wanlun Zhao, Giannakis, G.B.
Format: Article
Language:English
Subjects:
Analytical models
Antennas
Applied sciences
Continuous phase modulation
Continuous phase modulation (CPM)
Encoding
Exact sciences and technology
fading channel
Maximum likelihood detection
minimum shift keying (MSK)
Multiuser detection
Performance analysis
Performance gain
Radiocommunications
Signal analysis
Signal design
space time
Studies
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Viterbi algorithm
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Summary:Layered space-time (LST) transmissions employing continuous phase modulations (CPM) are well motivated for both bandwidth- and power-limited multiantenna communications. However, one of the major challenges for LST-CPM is the high complexity it incurs with maximum likelihood (ML) detection. In this paper, we develop reduced complexity LST-CPM receivers. First, we consider single antenna systems. Specifically, we study a reduced complexity Viterbi receiver for binary CPM. Based on this design, we introduce differential encoding for a class of CPM signals and analyze its performance gain both theoretically and with simulations. Second, we focus on multiantenna LST systems with minimum shift-keying (MSK)-type modulations. With group nulling-canceling (NC) and low-complexity linear equalization, we convert a coded multiuser detection problem into an uncoded one with small equalization loss. We also find that the combination of sphere decoding with hard-decision iterative processing is effective in boosting performance with a controllable complexity increase. Both analytical and simulated performance confirm that the novel LST-MSK receiver exhibits markedly improved performance relative to conventional NC detectors with moderate complexity increase.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2004.843051