| 摘要 |
A layered transmission reception device in which a first data series is transmitted with a signal space diagram whereas second and later data series is transmitted by using Feather transition. A re-modulated signal produced by re-modulating the data produced by modulating the first data series is subtracted from the sum signal of the received modulated signal by the first data series and the modulated signal by the second data series so as to extract/demodulate only a modulated signal by the second and later data series. Therefor it is possible to suppress the degradation of the error characteristics caused by the interference of the modulated signals by the data series. The error characteristics can be further improved either by controlling the amplitude of the re-modulated signal and adopting synchronous detection means as a demodulating means or by adopting a construction in which the code-to-code distance of the sum signal of the modulated signal by the first data series and the modulated signal by the second and subsequent data series is uneven.
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