PERFORMANCE EVALUATION OF A VARIABLE PROCESSING GAIN DS CDMA SYSTEM/

In this paper. ae analyze the multiple access interference of a variab le processing gain DS/CDMA system and define discrete partial crosscor relation Functions. We also evaluate the bit error rate of the system using Gaussian approximation and bounding technique. Three kinds of sp reading codes (long, short, and random codes) are considered in the an alysis of the system. It is shown that the bit error rate of a user is not relevant to the processing gain of interfering users: it is relev ant only to the processing gain of the user, transmitted powers, PN se quences, and spreading codes. The performance of short codes turns out to be better than that of long and random codes as in other systems.