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Abstract

A transmission terminal modulates, for a first state of given data signal, a non-return-to-zero code pseudo-noise signal onto a carrier band. Further, the terminal modulates, for a second state of the given data signal a Manchester-code pseudo-noise signal onto the carrier band. The terminal then sends a communication signal comprising the non-return-to-zero-code pseudo-noise signal and the Manchester-code pseudo-noise signal. A receiving terminal receives the communication signal and then uses, as an error signal, a signal resulting from multiplication of first and second correlation signals, the first correlation signal concerning the correlation between the communication signal, a reference pseudo-noise signal, and a clock signal which is used for generating the reference pseudo-noise signal, and the second correlation signal concerning the correlation between the communication signal and the reference pseudo-noise signal. The receiving terminal then demodulates the communication signal by comparing between magnitudes of the first and second correlation signals.

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First Claim