Patent ID: 8744019
Filing Date: 2014-06-03
Classification: H04L

Abstract:
1. A delay detection circuit that performs a part of decoding processing for decoding data transmitted by a transmitter apparatus based on a received wave, comprising: a delay correlation operation unit that performs a delay correlation operation on the received wave; an acquisition unit that detects whether the received wave is a communication signal transmitted by the transmitter apparatus based on an output of the delay correlation operation unit; and an output unit that outputs the output of the delay correlation operation unit to a decoding unit that decodes the data based on the output of the delay correlation operation unit, wherein the acquisition unit comprises: a pattern candidate storage unit that stores, in advance, a plurality of candidates for a shape of one symbol as pattern candidates; a shape generation unit that generates a shape of one symbol based on the output of the delay correlation operation unit; a comparison unit that compares the shape of one symbol generated by the shape generation unit and each of the plurality of pattern candidates; and a conformance determination unit that determines that the received wave is a communication signal transmitted by the transmitter apparatus when the shape of one symbol generated by the shape generation unit and any of the plurality of pattern candidates match for a plurality of times as a result of the comparison by the comparison unit.