CQPSK Continuous Quadrature Phase-Shift Keying modulation is more resistant to inter-symbol interference than C4FM Continuous 4-Level Frequency Modulation, and thus is much easier to transmit in a simulcast configuration. Both uses a 4800bd symbol rate with four-level signaling, resulting in the 9600bps data rate. Phase 1 can use either C4FM Continuous 4-Level Frequency Modulation (continuous 4-level FM Frequency Modulation) or CQPSK Continuous Quadrature Phase-Shift Keying (Compatible Quadrature Phase-Shift Keying, also known as Linear Simulcast Modulation) modulations. Phase 1 uses a 9600bps data rate to transfer IMBE-encoded voice or packet data. Modulations Phase I FDMA Frequency Division Multiple Access
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