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520<br />

QPSK signal<br />

plus noise<br />

(data rate=R)<br />

+ 90°<br />

phase<br />

shift<br />

_A+x(t)<br />

2 cos( c t+¨c)<br />

Carrier sync<br />

(from carrier<br />

sync circuits)<br />

Integrate<br />

and dump<br />

Bit sync<br />

(from bit<br />

sync circuitry)<br />

Threshold<br />

device<br />

Digital<br />

(data rate=R/2)<br />

Parallel<br />

to serial<br />

conversion<br />

m ~<br />

Digital output<br />

(data rate=R)<br />

–2 sin( c t+¨c)<br />

_A+y(t)<br />

Integrate<br />

and dump<br />

Threshold<br />

device<br />

Digital<br />

(data rate=R/2)<br />

Figure 7–13<br />

Matched-filter detection of QPSK.

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