Performance of forward-link cellular DS-CDMA over frequency-selective multipath fading channels

A new frequency-selective multipath-fading model is studied for a forward-l ink direct-sequence code-division multiple-access (DS-CDMA) system with a m ulti-cell configuration. In the performance evaluation of this model, the p robability density function (pdf) of the interference-to-signal ratio is fi rst derived in closed form. This pdf is then employed to form a compact exp ression for efficient bit-error rate (BER) evaluation. Numerical results sh ow that more RAKE fingers are important to ensure good forward-link cellula r performance when the mobiles travel through different topographical envir onments.