Directional PSK modulation and demodulation system

Details Directional PSK modulation and demodulation system Directional PSK modulation and demodulation system

1978-04-26

1979-11-13

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 16R, 329107, 329122, 329137, 329154, 325 30, 325163, 325320, 325346, 325349, H04L 2720, H04L 2722

Patent

active

041745051

ABSTRACT:
A direction phase shift keyed communication system provides the capacity to transmit any one of two symbols for each modulation level. The modulator produces a substantially constant frequency signal which includes a phase transistion in respect of each information bit. In a system with a single modulation level, corresponding to a phase transistion .phi., one of the two symbols is represented by a phase transition +.phi., i.e., an advancing phase transition. The other symbol is represented by a phase transition -.phi., i.e., a retarding phase transition. A demodulator responds to a substantially constant frequency signal with a phase transition included, and produces an output signal of a first kind in response to an advancing phase transition +.phi. and an output signal of a second kind in response to a retarding phase transistion -.phi.. The system is capable of operating with multiple modulation levels, each of which can represent any one of two symbols, depending on the sense, i.e., advance or retad, of the transistion. Preferably, each modulation level is 180.degree. or a multiple thereof.

REFERENCES:
patent: 3492576 (1970-01-01), Warters

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