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A new decoding scheme for errorless codes for overloaded CDMA with active user detection

Mousavi, A ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1109/CTS.2011.5898919
  3. Publisher: 2011
  4. Abstract:
  5. Recently, a new class of binary codes for overloaded CDMA systems are proposed that not only has the ability of errorless communication but also suitable for detecting active users. These codes are called COWDA. In [1], a Maximum Likelihood (ML) decoder is proposed for this class of codes. Although the proposed scheme for coding/decoding shows impressive performance, the decoder can be significantly improved. In this paper, by assuming practical conditions for the traffic in the system, we suggest and prove an algorithm that increases the performance of the decoder several orders of magnitude (the Bit-Error-Rate (BER) is divided by a factor of about 400 in some E b/N0's). The algorithm supposes the Poisson distribution for the time of activation/deactivation of the users
  6. Keywords:
  7. Activation/deactivation ; CDMA system ; Decoding scheme ; Maximum likelihood decoders ; Orders of magnitude ; User detection ; Algorithms ; Bit error rate ; Decoding ; Information technology ; Maximum likelihood ; Poisson distribution ; Telecommunication ; Code division multiple access
  8. Source: 2011 18th International Conference on Telecommunications, ICT 2011, Ayia Napa, 8 May 2011 through 11 May 2011 ; 2011 , Pages 201-205 ; 9781457700248 (ISBN)
  9. URL: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5898919