| 摘要 |
A carrier detector which is capable of performing high-accuracy carrier detection even with patterns other than a carrier recovering (CR) pattern by processing signals on the frequency axis, regardless of the existence of the residual frequency due to the quasi-coherent detection. The carrier detector converts a received signal having been subject to the quasi-coherent detection, A/D conversion, filtering for eliminating noises and expressed on the time axis into that expressed on the frequency axis by the time axis/frequency axis converting circuit. An accumulator 2 accumulatively adds the signals expressed on the frequency axis, and a decision section compares the accumulated value output from the accumulator to a predetermined threshold to detect the coming of the burst so as to detect the carrier.
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