Abstract
Currently, multiple modulation schemes based on QPS K are applied more and more widely. They are involved in digital microwave communication system, digital satellite communication system, broadband access, mobile communication and cable television system. QPS K is quarternary phase-shift keying. It characterizes digital information input through differences of four different phases of carrier. It specifies four phases of carrier. One dual-bit code element is corresponding to two binary information bits. They can be regarded as the synthe sis of two 2PS K signals. In QPS K, each modulation can transmit two information bits. They are transferred through four phases of carrier. This design realizes modulation and demodulation of QPS K on Matlab platform. It then verifies relevant theoretical knowledge of QPS K systematically.
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