ASSESSMENT OF MVDR ADAPTIVE BEAMFORMING ALGORITHM IN UNIFORM LINEAR ARRAYS, UNIFORM RECTANGULAR ARRAYS AND UNIFORM CIRCULAR ARRAYS CONFIGURATIONS

Nowadays, the ever-growing demand for mobile communications is constantly increasing the need for improved capacity, better coverage and higher-quality service. Whereas the capacity and reliability of wireless communication systems are limited by three major disabilities; multipath fading, delay spread and co-channel interference. Beamforming (BF) technique is a powerful means of increasing capacity, data rates and coverage of the wireless cellular communication system. One of the most popular and widely used approaches to Adaptive Beamforming (ABF) is the Minimum Variance Distortionless Response (MVDR) which is able to reduce the interference plus noise energy without distorting the desired signal. In this paper, MVDR BF with various antenna array geometries includes; uniform linear arrays (ULAs), uniform rectangular arrays (URAs) and uniform circular arrays (UCAs) consisting of L elements each operated in frequency of 2.6 GHz that is implemented in LTE networks was used for analyze and compare the performance of MVDR beamformer. From this study, it is found that the MVDR BF technique with ULA has the best performance and capable of forming adaptive beams with nulling capability towards interfering signals of average null power up to 42.8 dB with improvement on SINR approximately 9% and 11% comparing to UCA. As comparisons, the MVDR technique with ULA is much more accurate than the URA and UCA to null the interference source and steer its radiation lobe with high power towards the desired signal. To evaluate the performance of this work, one user with four interferences sources were used through computer simulation by using Matlab.