Linear Decoupled and Quasi-Decoupled Space-Time Codes

Space-time transmit diversity results in coupling of transmitted symbols across different antennas, which increases the complexity of maximum-likelihood decoding. Symbol coupling can be completely or partially avoided if the space-time code (STC) satisfies specific decoupling conditions; examples of...

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Bibliographic Details
Published in:IEEE transactions on communications 2007-01, Vol.55 (1), p.54-59
Main Authors: Razaghi, P., Khalaj, B.H., Shamsi, M.
Format: Article
Language:English
Subjects:
Algebra
Antennas
Antennas and propagation
Applied sciences
Block codes
Coding, codes
Couplings
Decoding
Decoupling
Delay
Exact sciences and technology
Gain
Information, signal and communications theory
Joining
linear codes
Maximum likelihood decoding
Maximum likelihood detection
multiple antennas
Radiocommunications
Receiving antennas
Signal and communications theory
Slot antennas
space-time
Symbols
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Transmitting antennas
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Summary:Space-time transmit diversity results in coupling of transmitted symbols across different antennas, which increases the complexity of maximum-likelihood decoding. Symbol coupling can be completely or partially avoided if the space-time code (STC) satisfies specific decoupling conditions; examples of such codes are orthogonal space-time block codes and quasi-orthogonal codes. In this letter, we study decoupling conditions for a linear full-diversity STC. Quasi-decoupled codes are proposed as a partially decoupled full-diversity STC of any rate for any number of transmit antennas with minimum decoding delay. By optimizing the coding gain of quasi-decoupled codes, it is shown that quasi-orthogonal codes have competitive performance with respect to the Alamouti code, and the more-recent threaded algebraic space-time (TAST) codes and ABBA codes. A general full-diversity decoupling condition is considered, and the general solution to this case, which also encompasses previously known orthogonal STCs, is derived
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2006.887479