Multiple access performance in UWB systems using time hopping vs. direct sequence spreading

Ultra-wideband radio systems operate using extremely short duration signaling pulses. Spread spectrum techniques for multiple access and interference suppression are commonly considered for such systems. We compare time-hopping spread spectrum with pulse position modulation (TH-PPM) and time-hopping/direct-sequence spreading with antipodal signaling (TH/DS-BPSK) in terms of their multiple access performance, and present some arguments for the use of one versus the other in a given system.

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