Blind channel estimation in aperiodic time hopping ultra-wideband systems

In a traditional pulse position modulation (PPM) time hopping ultra-wideband (UWB) communication system, each user is assigned a distinct time-hopping sequence, either periodic short sequence or aperiodic long sequence. This paper focuses on blind multiuser channel estimation in aperiodic time hopping UWB systems, using both the least squares method and the correlation matching method. After we formulate the PPM UWB signal to a pulse-rate discrete-time linear model, instantaneous estimate of the mean or correlation of received signals can be explored to estimate the channel. We also introduce corresponding single user variants of both methods. The estimation performance is evaluated by simulations in the end.