PSO-based multiuser detectors for high-order modulation DS/CDMA systems under spatial and multipath diversities

  • Authors:
  • Bruno A. Angélico;Taufik Abrão;L.D. De Oliveira;Paul Jean E. Jeszensky

  • Affiliations:
  • Electrical Engineering Department, Federal Technological University of Parana UTFPR, Cornelio Procopio, PR, Brazil;Electrical Engineering Department, State University of Londrina, P.O. Box 6001, 86051-970, PR, Brazil;Department of Telecommunication and Control Engineering, Escola Politecnica of the University of Sao Paulo, Sao Paulo 05508-900, Brazil;Department of Telecommunication and Control Engineering, Escola Politecnica of the University of Sao Paulo, Sao Paulo 05508-900, Brazil

  • Venue:
  • International Journal of Wireless and Mobile Computing
  • Year:
  • 2013

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Abstract

In this paper, the uplink direct-sequence code-division multiple access DS-CDMA multiuser detection MuD problem is studied from a heuristic perspective. The heuristic particle swarm optimisation PSO approach is due to the NP-complexity of the MuD optimisation problem. The challenge is to solve the associated hard complexity problem in a polynomial time. A complete parameter optimisation procedure for PSO applied to the MuD problem is carried out herein under different system configurations, such as high-order modulation and diversity exploitation. The PSO-MuD performance is analysed through Monte Carlo simulation MCS method. MCS results show that, after convergence, the performance achieved by the PSO-MuD is much better than that shown by the conventional detector, and somewhat closer to that given by the single-user bound. The flat Rayleigh channel is initially considered, but the results are further extended to the space-time wireless channels.