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Performance evaluations and comparisons of several LDPC coded MC-FH-CDMA systems

Behroozi, H ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. Publisher: Sharif University of Technology , 2006
  3. Abstract:
  4. In this paper, the application of regular Low-Density Parity-Check (LDPC) codes in Multi-Carrier Frequency-Hopping (MC-FH) CDMA systems is studied. To this end, different well-known constructions of regular LDPC codes are considered and the performance of LDPC coded MC-FH-CDMA systems, based on these constructions, are evaluated and compared in a frequency-selective slowly Rayleigh fading channel. These results are compared with those previously reported for super-orthogonal convolutionally coded MC-FH-CDMA systems. The simulation results indicate that the LDPC coded MC-FH-CDMA system significantly outperforms the uncoded and super-orthogonal convolutionally coded schemes. To alleviate the restrictions imposed by well known LDPC construction methods when applied to the coded MC-FH-CDMA system considered, a new semi-random construction is proposed and its performance is evaluated in the coded scheme. The simulation results indicate that this new construction substantially outperforms other well-known construction methods in the application considered. © Sharif University of Technology
  5. Keywords:
  6. Rayleigh fading ; Low-Density Parity-Check (LDPC) ; Multi-Carrier Frequency-Hopping (MC-FH) ; Rayleigh fading channel ; Carrier communication ; Code division multiple access ; Codes (symbols) ; Communication channels (information theory) ; Computer simulation ; Performance assessment ; Simulation
  7. Source: Scientia Iranica ; Volume 13, Issue 4 , 2006 , Pages 337-347 ; 10263098 (ISSN)
  8. URL: http://scientiairanica.sharif.edu/article_2592.html