Comparison of demodulation techniques for code time division multiple access

Demodulation techniques for the multiple accessing scheme Code Time Division Multiple Access are compared. To simplify the demodulator it is divided into two parts, a despreader and a user separator. For despreading it is shown that a sequence aperiodic inverse filter is preferred over the sequence matched filter. For user separation the performance of a channel matched filter, a decision-feedback equalizer, linear minimum-mean square error filters, the hard-output Viterbi Algorithm and the Forward-Backward Algorithm are compared in terms of cut-off rate. The resulting curves quantify the performance improvement attained by using more powerful algorithms.