In this paper, we present a performance analysis of a wireless multimedia direct-sequence code-division multiple-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 and convolutional 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 capacity performance 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 rates in the optimal power controlled system, dramatic increase in system capacity can also be achieved.
- Concatenated coding
- Multipath fading channels
- Power control
- Wireless multimedia communications
ASJC Scopus subject areas
- Computer Science Applications
- Electrical and Electronic Engineering