INFORMATION TRANSMISSION METHOD AND APPARATUS THEREFOR Russian patent published in 2015 - IPC G08C19/00 

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to telemetry and can be used in systems for transmitting data via communication channels. The technical result achieved lies in 1) a high signal-to-noise ratio at the input of a signal demodulator when transmitting "1" symbols of a binary code and noise compensation when detecting "0" symbols; 2) enabling multiplexing of DPSK and FM signals owing to that said signals replace each other at the transmitting side in accordance with the generated levels of the logic binary code, and during reception time intervals without one of the FM frequencies is substituted with corresponding sinusoidal or cosinusoidal harmonic oscillations generated by local frequency generators. In the method, phase-shift keying is replaced at the transmitting side with differential phase-shift keying (DPSK) at a first and a second carrier frequency, after which frequency modulation (FM) is performed by connecting to a radio channel at first and second carriers with DPSK according to the law of variation of the primary digital group signal with a duration T₀ of the binary code symbols. Further, the second carrier with DPSK is transmitted, and when receiving information from restored fragment, continuous first and second carrier frequencies are generated and delayed by a time equal to the duration of minimum-duration pulses of the corresponding restored instances of digital group video signals T₀ and T₀/2, and then summed to increase the signal-to-noise ratio.

EFFECT: providing phase synchronism of an immediately generated DPSK signal and a DPSK signal delayed by a time T₀ when transmitting "1" symbols of a binary code of transmitted messages; phase opposition of a generated DPSK signal and a DPSK signal delayed by a time T₀ when transmitting "0" symbols of a binary code of transmitted messages.

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