3.1. Introduction
After narrow UWB pulses are generated, they need to be modulated with data prior to transmission. Data modulation for carrierless UWB systems is typically done using pulse-modulation techniques in the time domain. The choice of modulation method can affect a number of design parameters in UWB system development: data rate, robustness to interference and noise, spectral characteristics of the transmitted signal, and transceiver complexity that directly impacts the overall size and cost of the system. In this chapter, we consider some commonly employed UWB modulation options and discuss the advantages and challenges of each method. The modulation techniques we cover are on-off keying (OOK), pulse-amplitude modulation (PAM), pulse-position ...
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