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The paper analyzes M-ary modulation schemes of time hopping ultra-wideband (TH-UWB) system. Based on the performance analysis of the two conventional multiple modulation schemes TH PPM and TH PAM, a combined modulation scheme (TH OPPM-BPSM) is analyzed. By introducing the modified Hermite polynomial (MHP) orthogonal pulses, three transmission schemes are analyzed through computer simulations under additive white Gaussian noise (AWGN) channel with mutipath effect. From the simulation results, it can be seen that the TH OPPM-BPSM system performance is similar to the TH PPM system, and better than the TH PAM system.

This paper makes a key research of a combined modulation scheme (TH OPPM-BPSM) for UWB systems. The proposed scheme achieves higher data rate by introducing more number of orthogonal pulses in the same pulse repetition interval. It also reduces the system complexity by half by introducing antipodal version of orthogonal pulses. The proposed transmission scheme is analyzed through computer simulations under additive white Gaussian noise (AWGN) channel without multipath and with mutipath respectively.