This second part of the paper presents the system design and performance simulation results of a novel ultra-wideband (UWB) system developed for low power, long range, mid to high data rate mesh networking applications. Firstly, the transceiver architecture is described, and the system parameters are selected and justified. Then, the physical layer (PHY) protocol is introduced briefly. Finally, the simulation results regarding the system performance with different data rates in Gaussian and multipath channels are given. It is concluded that the designed transceiver architecture and PHY protocol are adequate and the developed receiver algorithms are feasible for practical implementation.