Performance of Impulse Radio and Direct-sequence Impulse Radio in the Presence of Interference

The performance of two ultra wideband communication systems is investigated. The two systems are time-hopping impulse radio (TH-IR) and a variation of it, termed direct-sequence IR (DS-IR). For both systems, binary pulse position modulation and binary pulse amplitude modulation are included respectively. Firstly, the difference between IR and direct sequence spread spectrum (DSSS) is studied. Next, a model for the system and interference is introduced. Particularly for the evaluation of the system performance, tone, multitone, partial-band and barrage interference signals are considered as the interference signals. A comparison between the interference suppression capabilities of TH-IR and DS-IR is carried out under conditions similar to both systems. It is shown that in most cases, the jam resistance of DS-IR is superior to that of TH-IR.