Tradeoffs of Source Coding, Channel Coding and Spreading in Frequency Selective Rayleigh Fading Channels

Authors:
Qinghua Zhao;Pamela Cosman;Laurence B. Milstein
Affiliations:
Department of Electrical and Computer Engineering, University of California, San Diego. 9500 Gilman Drive, La Jolla, CA 92093-0407, USA;Department of Electrical and Computer Engineering, University of California, San Diego. 9500 Gilman Drive, La Jolla, CA 92093-0407, USA;Department of Electrical and Computer Engineering, University of California, San Diego. 9500 Gilman Drive, La Jolla, CA 92093-0407, USA
Venue:
Journal of VLSI Signal Processing Systems
Year:
2002

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Abstract

This paper investigates the tradeoffs of source coding, channel coding and spreading in CDMA systems. We consider a system consisting of an image source coder, a convolutional channel coder, an interleaver, and a direct sequence spreading module. With different allocations of bandwidth to source coding, channel coding and spreading, the system is analyzed over a frequency selective Rayleigh fading channel. The performance of the system is evaluated using the cumulative distribution function of peak signal-to-noise ratio. Tradeoffs of different components of the system are determined through simulations. We show that, for a given bandwidth, an optimal allocation of that bandwidth can be found. Tradeoffs among the parameters allow us to tune the system performance to specific requirements.