| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a radio signal synchronous processing apparatus capable of reducing the amount of correlation operation and power consumption. <P>SOLUTION: The radio signal synchronous processing apparatus comprises: a replica signal generating unit 60 that performs frequency modulation on preamble data identical to a preamble part of an IQ reception signal, and delay detection on the obtained data before making hard decision on the detected data to output the thus obtained data as a replica signal; a correlation calculating unit 20 that calculates a correlation power value by performing correlation calculation both on the replica signal and on the IQ reception signal, which has been subjected to delay detection, and that calculates a frequency offset estimated value by calculating a phase rotation amount caused by a frequency offset from the phase of the correlation power value; a correlation-power-value peak detecting unit 30 that detects, as frame timing, timing of a maximum correlation power value; a preamble detecting unit 40 that outputs, as a preamble detection result, the result of comparison between the maximum correlation power value and a predetermined correlation-power threshold value; and an AFC unit 50 that performs frequency offset correction on the IQ reception signal, which has been in a state prior to delay detection, by using the frequency offset estimated value. <P>COPYRIGHT: (C)2013,JPO&INPIT |
