In-phase quadrature demodulator for CPSK signals

摘要: A system for demodulating a coherent, phase-shift-keyed signal that is modulated by set of orthogonal or biorthogonal code words. The does not require local phase reference locked with the received signal. made up two demodulators and microprocessor. One demodulator utilizes sinusoidal in demodulation process, second uses cosinusoidal process. Because phases signals do change significantly respect to unmodulated during period time occupied single word, output one other resembles word which was transmitted. words compared outputs determine transmitted, data corresponds system.