thumb|600px|center|Receiver structure for QPSK. The matched filters can be replaced with correlators. Each detection device uses a reference threshold value to determine whether a 1 or 0 is detected.
tHuMB|600px|ceNTer|REceiver StrucTURe for qpsk. tHe MaTched fILtErs Can BE Replaced wITh correlaTorS. EACh deteCtION DevICe UseS A reFerENce tHReshOld vAlue tO dEterminE WHethEr a 1 Or 0 IS DeTEcTeD.