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On the differences between uplink and downlink transmission in code-spread CDMA systems

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4 Author(s)
Persson, A. ; Dept. of Signals & Syst., Chalmers Univ. of Technol., Goteborg, Sweden ; Lassing, J. ; Ottosson, T. ; Ström, E.

The bit error rate (BER) of a code spread CDMA system, using low rate convolutional codes for spreading, is analyzed. The system is assumed to operate over a Rayleigh flat fading channel, and white Gaussian noise is added at the receiver front end. Based on a Gaussian approximation, expressions for the pdf of the signal-to-noise ratios are derived for both uplink and downlink transmission. Computer simulations of the system BER, as well as analytical results based on a union bound, are presented. The analytical results are in close agreement with the computer simulations

Published in:

Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd  (Volume:4 )

Date of Conference:

2001