Patent ID: 8509360
Filing Date: 2013-08-13
Classification: H04B,H04L

Abstract:
1. A pulse radio receiving apparatus comprising: a reference waveform generation section that generates a reference waveform signal; a delay section that generates a plurality of delayed waveform signals by delaying the reference waveform signal by different amounts of delay; a correlation calculation section that generates a plurality of correlation values comprising a correlation value between a received signal and the reference waveform signal and a correlation value between the received signal and each of the plurality of delayed waveform signals; a determination section that compares the plurality of correlation values in a combination comprising the correlation values, which are not adjacent to each other in a time domain, and generates a difference detection signal showing a direction and degree of a phase shift between the received signal and the reference waveform signal according to comparison results; and a synchronization control section that controls a phase of the reference waveform signal generated by the reference waveform generation section based on the difference detection signal, wherein, for the combination of the correlation values, the determination section is configured to: use, for a first combination, a first correlation value calculated using the reference waveform signal and a third correlation value calculated using one of the plurality of delayed waveform signals other than a delayed waveform signal with a greatest amount of delay in the delayed waveform signals; use, for a second combination, a second correlation value calculated using the delayed waveform signal with the greatest amount of delay and a fourth correlation value calculated using one delayed waveform signal other than the signal with the greatest amount of delay in the plurality of delayed waveform signals; and generate the difference detection signal based on a relative scale between a first evaluation value obtained by subtracting the first correlation value from the third correlation value in the first combination and a second evaluation value obtained by subtracting the second correlation value from the fourth correlation value.