Improved Power and Capacity Predictions of a CDMA System with Base-Station Antenna Arrays and Digital Beamforming

In a time when it is becoming increasingly important to find ways to enable more mobile users to use the same space, it is particularly important to find ways of predicting the performance of a code-division multiple access (CDMA) system. Currently system capacity can be increased by decreasing the cell size in order to manage a larger number of mobiles in the same space or by increasing the individual cell capacity through methods such as digital beamforming. This paper extends power and capacity estimates shown by Earnshaw in [1] and Earnshaw and Blostein in [5] to make improvements for the multi-element antenna array case. We also extend this research to include prediction and simulation of power and capacity in scattering environments with variable scattering radii modifying a model given by Salz and Winters in [2]. 1 Introduction CDMA technology has been widely studied as a means of achieving increased spectrum efficiency in digital cellular technology. The demand for cellular s..