An investigation on the impact of antenna array geometry on beamforming user capacity.

摘要

In this investigation we compare four antenna array geometries in a variety of scenarios in the quest to find the array geometry that maximizes the system user capacity.; We compare four array geometries in the following steps: First, we present the power pass through factors and the user capacity expression, which are then applied to each of the arrays for the case of known direction-of-arrival (DOA). Second, the same procedure is applied to the case where the DOA is estimated. In this case we assume that the estimated DOA is represented by an unbiased Gaussian random variable with variance given by the Cramer-Rao lower Bound. We calculate the capacity values for the arrays using the Monte-Carlo method, which is quite time and resource intensive and limits the scope of the array comparisons. The results thus obtained show that the effect of DOA estimation on the system capacities based on the CRB is small.; Third, we modify existing perturbed output SINR expression to take correlations between the array response vector elements into account, and apply the results to system capacity calculations. (Abstract shortened by UMI.)