DOA based adaptive beamforming with RAKE for TDSCDMA cellular networks

Smart Antenna Array acquires the spatial signatures of the signals to estimate the direction of arrival (DOA) and subsequently steer multiple beam towards the desired signals and eliminate co-channel interference and increase the system capacity and improve the communication quality. Smart array with Rake receiver may counter signal multipath effect and improve information reliability. The purpose of this paper is to study the performance of the smart antenna DOA based beamforming algorithm applied to Time Division Synchronous Code Division Multiple Access (TDS -CDMA) system. The simulation results shows that a TDS-CDMA system with smart antenna and rake receiver, compared with an omnidirectional antenna, can have lower bit error rate at a specific signal to noise ratio (SNR), allow more users to access the system at the specific bit error rate thus increase the system capacity. However, performance of smart antenna system greatly depends on efficiency of digital signal processing algorithm applied at the adaptive processor.