UQPSKUnbalanced Quadrature Phase-Shift Keying
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Similarly, while binary phase shift keying (BPSK) modulation is used for lower data rate transmission, using an S-band carrier, the higher data rates payload signals are carried by either QPSK or UQPSK modulated X-band carriers.
The data demodulators/bit-synchronizers are designed with multifunction capabilities to receive data from any input modulation comprised of BPSK, QPSK or UQPSK.