Thus PSK systems require less transmitted power for a given probability of error than ASK or FSK systems. Synchronous detection of PSK signals is required,due to the absense of a large carrier component.Carrier recovery is there for emore complex and expensive. DPSK systems are often a good compromise,offering simpler circuit ryata small performance cost.The PSD of a PSK waveform is centered around!c, and has an identical shape to that of the double side band modulating spectral density

phase-shiftKeying.pdf

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