Capacity analysis of DS-CDMA system with beam steering-sectorized antenna over Nakagami frequency-selective fading channels

The capacity improvements achievable using beam steering-sectorized array antenna with the direct sequence code division multiple access (DS-CDMA) system for the reverse link are analyzed. A wide-sense stationary uncorrelated scattering (WSSUS) channel model and perfect power control are assumed in the analysis. The impacts of phase error of receiver and voice activation are also considered. The average error probabilities for the reverse link of the DS-CDMA system over a Nakagami frequency-selective fading channel using a partially coherent receiver are derived. The capacity of the DS-CDMA system using a beam steering-sectorized antenna is quantified and compared with that of sectorized and omnidirectional antennas. The signal-to-noise ratio derived in this paper can directly describe the interrelationships among the number of users, Nakagami fading parameter, directivity of antenna, and voice activity factor