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US 2006/0093046 A1Published application
Digital communication method and digital communication device
OwnerMakoto Nakamurainventor
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OwnerMakoto Nakamurainventor
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A digital communication device includes: a modulator having encoding means for converting two-dimensional digital information signal into a three-dimensional signal and phase modulation means for modifying the carrier phase in according to the three-dimensional signal; and a demodulator having phase demodulation means for detecting information on the three-dimensional signal from the received phase-modulated wave and demodulation means for deciding the two-dimensional digital information from the information on the three-dimensional signal. The digital communication device has a bit error ratio and an occupied radio band width equivalent to a digital communication device using the conventional QPSK or π/4 shift QPSK and the error correction method and greatly improves the amplitude fluctuation. Moreover, the digital communication device can transmit a signal with a narrower occupied frequency band width while maintaining the same constant envelope characteristic as the GMSK using the conventional error correction code.
A digital communication method, characterized in that a binary digital information signal is made into a multivalued ternary signal by means of binary-input/ternary-output error correction code conversion, and is encoded, the phase of a carrier wave is changed and subjected to three-phase modulation in response to the multivalued and encoded ternary signal, and the three-phase modulated signal is transmitted.
A digital communication method, characterized in that information related to a ternary signal is detected from a binary-input/ternary-output error correction code by phase demodulating a three-phase modulated signal, and binary digital information is obtained by decoding the binary-input/ternary-output error correction code using information related to the ternary signal obtained by the phase demodulation.
A digital communication device, characterized in comprising:
A digital communication device, characterized in comprising:
A constant envelope three-phase modulator, characterized in comprising:
A binary-input/ternary-output error correction encoder, characterized in comprising:
A binary-input/ternary-output error correction encoder, characterized in that a generating function generates, with respect to a binary input signal, a ternary output error correction code prescribed by either
A digital storage device, characterized in comprising:
A digital storage device, characterized in comprising a constant envelope three-phase modulator which comprises:
A digital storage device, characterized in comprising a binary-input/ternary-output error correction encoder, which comprises an even number of delaying means for delaying an input signal of a binary digital information signal, and modulo 3 adding means for carrying out an operation over a Galois field GF(3) on a signal outputted from the delaying means and an input signal, and uses at least the input signal and final delaying means output signal in an operation over the Galois field GF(3).
A digital storage device, characterized in comprising a binary-input/ternary-output error correction encoder in which a generating function generates, with respect to a binary input signal, a ternary output error correction code prescribed by either
Dependencies are inferred from the claim text.