Optimal CDMA signatures for correlated sources with a multi-antenna receiver

Abstract

This paper presents an approach to optimizing CDMA signatures for multiple correlated sources in a sensor network when the common receiver is equipped with multiple antennas. An algorithm for determining optimal CDMA signatures under individual transmitter power constrains is presented. The numerical results show that the optimum signatures outperform orthogonal signatures by exploiting the inter-source correlation and the channel state information. Furthermore, the results show that the optimum signatures are most effective when the product of the number of receiver antennas and the bandwidth expansion is equal to the number of sources.