A "two-step" synchronous sliding method of sub-nanosecond pulses for ultra-wideband (UWB) radio

An ultra-wideband (UWB) impulse radio system, generating and receiving pulses of the order of a nanosecond or less, provides not only the promise of high system performance, such as low power, high data rate, being fade-free, enormous capacity, etc., but also the technical challenge of practical implementations, for example, synchronization of short pulses is quite difficult. A "two-step" synchronous method of sub-nanosecond pulses is presented; it is based on the pulse sliding correlation theory. Moreover, the paper gives a synchronous loop design, made up of a mixture of analog and digital modules, and the digital circuit design and functional simulation implementation. The loop decision threshold and the synchronous time parameters are also detailed.