| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a frame synchronization acquisition circuit for generating a frame synchronization acquisition signal, without causing the degradation in the performance even in an interfered channel, as much as possible. <P>SOLUTION: The frame synchronization acquisition circuit includes: an autocorrelation computing element 2, which performs autocorrelation operation of an input time signal; a mutual correlation computing element 6, which performs mutual correlation operation between the input time signal and a preamble signal sequence; a correlation product computing element 8 for multiplying an autocorrelation value and a mutual correlation value to calculate a correlation product; a digital filter 9, which weights and sums a periodic waveform appearing in the correlation product by a training signal period; a maximum value detector which detects the magnitude and time of a maximum value of the periodic waveform appearing in the correlation product; and a synchronous point determination means which compares the correlation product values at respective sample points with a value resulting from multiplying the maximum value by a constant, in a prescribed time section that ends at a time point, before the maximum value time and outputs, as a synchronization acquisition signal, timing at a sample point of the earliest time out of sample points at which the correlation product values are larger than the value resulting from multiplying the maximum value by the constant. <P>COPYRIGHT: (C)2010,JPO&INPIT |
