The effect of amplitude fades on a forward transmission system using a DS CDMA

In this paper, we a study the effect of using pseudorandom sequence spread spectrum signal (Gold sequence) on the generation and detection process of a DS CDMA system with fade amplitudes. The forward transmission in the IS-95 system is assigned to individual base stations using orthogonal (Hadamard) sequences to each of them. The use of pilot-aided Rake receiver gives a conditional bit error probability that does not depend on the number of users and the effect of fade amplitudes decreases the probability of error. This phenomenon can be compensated by increasing the normalized energy per one user.