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Spectral shaping of UWB signals for time-hopping impulse radio

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2 Author(s)
Y. -P. Nakache ; Mitsubishi Electr. Res. Labs., Cambridge, MA, USA ; A. F. Molisch

This paper studies the design of signaling waveforms for time-hopping impulse radio (TH-IR) with limits on the power spectral density. Such restrictions are imposed by the spectral mask prescribed by frequency regulators for ultra-wideband (UWB) signals. The "conventional" TH-IR system with pulse-position modulation and time-hopping multiple access gives rise to spectral lines that either violate the regulations, or require a significant power backoff. To remedy this situation, we propose the use of polarity randomization, which eliminates the spectral lines and also leads to a smoothing of the continuous part of the spectrum. We analyze different variants of the polarity randomization, considering short and long randomization sequences, as well as symbol-based or pulse-based randomization. We analyze the effect of this technique on both pulse position modulation and binary phase-shift keying modulation.

Published in:

IEEE Journal on Selected Areas in Communications  (Volume:24 ,  Issue: 4 )