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Ultra-WideBand (UWB) signals have very large bandwidth which allow accurate ranging using time domain techniques. Precise UWB ranging requires accurate estimation of Time of Arrival (ToA). Several schemes have been reported for ToA estimation. Among these schemes, the threshold based ToA estimators have attracted interest due to simplicity of its hardware implementation. The authors proposed a threshold based ToA estimation approach which minimizes the range error by setting the threshold as a function of distance.
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