Performance Analysis of Wireless Multimedia DS/CDMA Communications withPower Control and Hybrid ARQ

  • Authors:

  • K. B. Letaief;Y. F. Melanie

  • Affiliations:

  • Center for Wireless Information Technology, Electrical and Electronic Engineering Department, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P.R. China E- ...;Center for Wireless Information Technology, Electrical and Electronic Engineering Department, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P.R. China E- ...

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 2002

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Abstract

In this paper, we present aperformance analysis of a wireless multimedia direct-sequence code-divisionmultiple-access(DS/CDMA) system based on different error control schemes and an optimal power control algorithm over multipath Rayleigh fading channels.The error control schemes consist of Forward Error Correction (FEC), diversity, and Automatic Repeat reQuest (ARQ). The concatenated codes with a Reed–Solomon outer code andconvolutional inner code are used as FEC. Since a multimedia system is required to support services with different rates and Quality of Services (QoS), different error control schemes are used to satisfy the requirements of different media. In particular, a power control algorithm which can optimize the capacityperformance of the integrated system is presented. Numerical results will show that power optimization can increase the capacity and decrease the total transmission power. By incorporating diversity and hybrid ARQ along with appropriate code ratesin the optimal power controlled system, dramatic increase in system capacitycan also be achieved.