| 摘要 |
The present invention relates to an signal-to-noise ratio (SNR) enhancement method by removing the influence of clock drift on multiple chip signals. The method comprises the following steps of: computing a filter coefficient of a chirp signal using a phase change among symbols adjacent to a received chirp signal and a phase change among adjacent samples within the same symbol; and computing an averaged symbol of a chirp signal from which an offset caused by the clock drift is removed by applying the filter coefficient to samples of the chirp signal and averaging the samples, wherein the filter coefficient is characterized by a coefficient that an offset caused by the clock drift is approximated as a linear phase component, and the accuracy of time synchronization can be improved using a symbol which is obtained by averaging multiple symbols from which the influence of clock drift is removed. [Reference numerals] (210) Computing a filter coefficient of a chirp signal using a phase change among symbols adjacent to a received chirp signal and a phase change among adjacent samples within the same symbol;(220) Computing an averaged symbol of a chirp signal from which an offset caused by the clock drift is removed by applying the filter coefficient to samples of the chirp signal and averaging the samples;(AA) Start;(BB) End |
