METHOD FOR MUTUALLY INVERTED BINARY DATA TRANSMISSION OVER PARALLEL PHASE-SEPARATED CHANNELS WITH PHASE KEYING AT SINGLE CARRIER FREQUENCY AND SUBTRACTION ON RECEIVING END Russian patent published in 1999 - IPC

FIELD: binary-digit message transmission by radio signals using relative phase keying. SUBSTANCE: two phase-separated parallel channels operating simultaneously at same carrier frequency are formed in transmitter and receiver. Binary messages are transmitted in mutually inverted form over these two channels using specific method of relative phase keying. Resultant signal received is shaped and separated from noise by subtracting one of mutually inverted data characters received over these phase-separated channels from other character. In the process, level of resultant signal received is increased and noise level is reduced. EFFECT: improved reliability and noise immunity of binary message transmission without raising transmitter power, transmission time, or extending frequency band. 1 dwg