Interference rejection in UWB systems using Smart STC based on GA Rake receivers and TR technique

A Smart Ultra-wideband (UWB) system using analog space time coding (STC) and adaptive GA (Genetic Algorithm) Rake receiver was previously introduced [1]. The smart UWB system showed a great enhancement in performance over the SISO (single input single output) UWB one in a peer to peer scenario. In this paper the smart UWB system is used with the TR (Time Reversal) to enhance the performance of the smart UWB system in addition to reducing the receiver complexity. This paper also shows that using TR technique with the smart UWB system helps combating interferences from other UWB systems. Due to the dense resolved multipath components in UWB system, TR technique helps concentrating most of the energy of the desired signal at certain instance or path delay while that of interferers is spread over the multipath components. Thus, the desired signal energy at the receiver is dominant over the interfering ones. Finally, the smart UWB system uses the GA Rake to adaptively select the path delay at which the desired signal energy is maximized.