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Linear decoupled and quasi-decoupled space-time codes

Razaghi, P ; Sharif University of Technology | 2007

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  1. Type of Document: Article
  2. DOI: 10.1109/TCOMM.2006.887479
  3. Publisher: 2007
  4. Abstract:
  5. 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. © 2007 IEEE
  6. Keywords:
  7. Data communication systems ; Decoding ; Maximum likelihood ; Mobile antennas ; Optimization ; Linear codes ; Maximum-likelihood decoding ; Multiple antennas ; Quasi-orthogonal codes ; Space-time codes ; Codes (symbols) ; Quasi-decoupled codes
  8. Source: IEEE Transactions on Communications ; Volume 55, Issue 1 , 2007 , Pages 54-59 ; 00906778 (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/4063516