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In this paper, we propose a range estimation algorithm which detects the arrival time of direct path using IEEE 802.15.4a chirp spread spectrum (CSS) signals. For the precise range estimation, time averaging of the dechirped signals, which are transformed from the received chirp signals in different bands, is applied for reducing the bias effect of the multipaths on direct path. We verified the effectiveness...
In this paper we present a technique to estimate the time delay of IEEE 802.15.4a chirp spread spectrum (CSS). Conventionally, the time delay can be estimated by the phase estimation of the samples of a dechirped sinusoid. We estimate the phase differences not between samples in a sub-chirp but between samples of adjacent sub-chirps to magnify the phase differences making this technique more robust...
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