Abstract: In mobile communication, the Rayleigh-Lognormal distribution can be obtained from the channel with large scale fading, shadowing fading and small scale fading. The Rayleigh-Lognormal distribution has no closed form equation so that it is not suited to the performance analysis. K distribution can be substituted for Rayleigh-Lognormal distribution since the difference between them is small and the K distribution has a closed form equation. The performance of distribution antenna system (DAS), generalized-DAS (GDAS) and center-SIMO with shadow fading are analyzed and compared based on K distribution for one transmitter antenna in uplink communication. A new method for calculating the upper bound closer than Jeason upper bound is proposed. Simulation and theory show that the performance of DAS is the best and that the performance of SIMO is the worst.

Key words: distributed antenna system, K distribution, channel capacity