Inter-symbol/inter-frame interference in time-hopping ultra wideband impulse radio system

A closed-form expression for the intersymbol/inter-frame interference variance is derived in the context of a time-hopping ultra wideband impulse radio based system. This enables us to theoretically analyze on the performance the influence of the time-hopping codes, of the rake receiver number of fingers, and of the guard-time size. Simulations sustain our claims.