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Performance of three-level spectrally encoded spreadtime CDMA in the presence of multiple interferences [electronic resource]

Mashhadi, S. (Saeed) ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1049/iet-com.2010.0301
  3. Abstract:
  4. In this study the authors present an in-depth study, analysis and discussion on maximum likelihood (ML)-based receiver for a typical spectrally encoded spread-time CDMA in the presence of multiple narrowband interference (NBI) signals in an additive white Gaussian noise channel. Furthermore, the authors demonstrate that by combining useful properties of ML-based receiver and three-level codes, that is, codes with values of -1, 0, +1, the authors can introduce a new strategy in which superior performance with respect to previous receiver structure based on two-level codes, that is, codes with values of -1, +1, can be attained. With the help of an example, the authors drive, first, the required signal-to-noise-interference power ratio (SNR) in a multiple access communication environment with multiple NBIs and, second, SNR attenuating parameter owing to multiple NBIs for two- and three-level codes. Finally, the authors relate the above parameters to a number of simple descriptive factors such as bit error rate. The results are validated by an extensive simulation on the aforementioned system
  5. Keywords:
  6. Codes ; Radiofrequency interference ; Code division multiple access ; Radio receivers ; AWGN channels
  7. Source: IET Communications ; July 2011, Volume 5, Issue 10, P. 1328-1335
  8. URL: http://digital-library.theiet.org/content/journals/10.1049/iet-com.2010.0301