On the Statistics of the Channel Capacity for a DS/FFH-CDMA System

In this paper, a constant total system’s allocated bandwidth hybrid direct-sequence/fast frequency hopping code-division multiple-access (DS/FFH-CDMA) cellular system, when operating in a Rayleigh fading environment, is examined. The described analysis leads to a novel-closed form expression for the probability density function (pdf) of the channel capacity per user, which relates the pdf of the channel capacity and all system’s parameters. In addition, the probability that the channel capacity per user does not exceed the available average channel capacity per user, in a Rayleigh fading environment, is derived. Finally, respective numerical results are presented to investigate the sensitivity of this probability value from various system’s parameters. Key-Words: Channel capacity, Hybrid DS/FFH-CDMA systems, Cellular systems, Rayleigh fading.