Carrier recovery device for an amplitude and phase modulation has sixteen states and system of reception of data comprising such a device

摘要

Carrier recovery device for the reception of clinical] transmitted by amplitude and phase modulation states has sixteen so-called qam 16, successively comprising a set of six channels v v in parallel compound each series of a multiplication circuit m and a low pass filter - f, a circuit of the selection of one of these three pairs of carriers thus obtained, a regulating loop phase 11 composed of a processing circuit 51 of the so-called costas which levied two carriers issued collecting zone and a signal proportional to the phase error on the signal received, a loop filter 52 and a voltage control oscillator 53, and a circuit 14 which phase shift levied the output signal of the oscillator 53 to send it to a second input of the multiplication circuits m has m, the item being carried out with a zero phase shift on m th on m and 2th on m, and with a phase shift of p2 on m, thp2 on m and 2thp2 on m th since equal to p4 - arctan 13. / p & & p & application: transmissions].