On the the performance analysis of the CDMA systems with antenna arrays

The performance analysis of the code division multiple access (CDMA) system with antenna arrays has been considered in this paper. We define the array gain, which is proportional to the signal to interference plus noise ratio (SINR), and show that the array gain is varying over the angle of arrival (AOA) of the signal impinging on the antenna array. it means that the SINR of a user can differ from that of other user depending on the user's location. The average array gain is obtained with respect to the AOA. Using the average array gain, we can define the optimum antenna array that maximizes the average array gain. Some properties of the optimum antenna array are considered. From this, we observe that the uniform linear array (ULA) is closer to the optimum array than the uniform circular array (UCA).