Multi-user access interference suppression for UWB system

In Ultra Wideband (UWB) multi-user environments, the existence of severe multi-user access interference (MAI) can cause significant performance degradations. In this paper, we propose an adaptive least bit error rate (LBER)-Rake receiver for synchronous CDMA-UWB systems. The combining weights of the Rake fingers are adapted based on the LBER criterion for MAI mitigation. We study the receiver performance by varying the number of fingers under different number of users. Performance analysis has been done by generating the conditional probability density function of the receiver output. Results show that the proposed receiver can suppress MAI more effectively and leads to an increase in the number of supported users.