Abstract
A novel modulation format is proposed for time-hopping pulse position modulation (TH-PPM) ultra wideband (UWB) communications, where an orthogonal set of user-specific TH codes is employed for M-ary code shift keying (MCSK) to carry additional data. A particular TH code, selected by log2 M-bit data, modulates the basic pulses (i.e., determines the location of the pulses), that are additionally time-shifted by binary PPM (BPPM), resulting in combined MCSK and BPPM (i.e., MCSK/BPPM). The combined modulation achieves increased data rate with respect to conventional TH-BPPM without affecting pulse shaping and can further improve the bit-error-rate (BER) performance. MCSK, which can also be employed by itself or combined with binary pulse amplitude modulation (PAM), is also shown to outperform TH M-ary PPM in dense multipath as it increases the diversity gain through randomized pulse locations.
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