Abstract
Ultra wideband (UWB) communications provides high data rate transmission at low power. Time hopping (TH) UWB is based on the discontinuous baseband transmission of extremely narrow pulses. TH coding, pulse shape design and robust modulation schemes are essential for coexistence with other systems and to reduce multiple access interference. The paper evaluates modulation options for TH-UWB systems. The bit error rate (BER) performances are evaluated in a high-density lognormal fading channel with strong narrowband interference. For high data rate transmission, biorthogonal modulation (BM) presents better BER performance for low modulation levels (M), and similar behaviour as pulse position modulation (PPM) for high M values. M-PPM with large M, is data rate bounded and complex to implement, making BM a better implementation choice.
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