| 摘要 |
PROBLEM TO BE SOLVED: To stably receive an orthogonal frequency-division multiplex signal with simple constitution. SOLUTION: A mixer 15 mixes and sends a receive signal amplified by an LNA 5 and receive signals having their phases shifted by phase shifters 9 to 11 to a tuner 16. According to the amplitudes of signals having triangular waveforms generated by triangular wave generators 12 to 14, the phase shifters 9 to 11 prescribe the phase shift quantities of the receive signals received by antennas 2 to 4 respectively. The phase shift quantities of the phase shifters 9 to 11 vary periodically, so the signal level after the synthesis by the mixer 15 varies periodically. Cycles of variation in the phase shift quantities of the phase shifters 9 to 11, i.e. Cycles of the signals generated by the triangular wave generators 12 to 14 are made shorter than the depth of time interleaving to disperse modulation errors, thereby enabling stable reception.
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