Performance evaluation of maximal-length, Gold and Kasami codes as spreading sequences in CDMA systems

This paper presents results of computer simulation that evaluates the performance of a direct-sequence code division multiple access (DS CDMA) system for three classes of spreading codes namely, Maximal-length, Gold and Kasami sequences. The need to select the optimum spreading code for DS COMA applications is shown from the system capacity and bit-error rate (BER) performance for each of the three types of codes. It is shown that knowledge of the cross-correlation peaks alone is not sufficient to establish which of the codes is better suited for CDMA applications. Hence it is shown that their performances depend on the whole spectrum of their cross-correlation functions rather than their peak values. Additional results of the BER performance of the CDMA system for the three types of spreading codes in frequency-selective multipath fading channel are featured.