Performance of DS Time Hopping Ultra Wideband Systems with Diversity

In this paper, a direct sequence (DS) time hopping (TH) ultra wideband (UWB) communications system, denoted as DS-TH-UWB is introduced and analyzed. This is a hybrid technique combining the conventional time hoping and direct sequence techniques. The system is analyzed in terms of the signal-to-noise plus interference ratio (SNIR) and bit error rate (BER) performance. In particular, we provide analytical expressions for the SNIR and BER as a function of several system parameters. The performance of the proposed system is compared with other techniques. Furthermore, the impact of diversity on the performance is demonstrated. Numerical results indicate that the BER performance of the DS-TH-UWB system is superior to the other techniques and can be improved significantly with the use of diversity.