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Compatible Differential Offset Quadrature Phase Shift Keying, another name for DQPSK with 4 bit styles: 0,1, 10, and 11, more difficult to decode without proper signal comparator processing. Where older forms such as C4FM/BPSK, where only 2 bits of data were encoding a 1 or 0.

Return to wiki page: APCO Project 25, Simulcast digital distortion
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