A Costas loop with adjustable quantizers is demonstrated to be capable of carrier recovery for a wide range of Amplitude-Phase-Keyed (APK) modulation formats. Expeximental verification was obtained for QPSK, 8-PSK, and 16-QAM.
Keywords :
Autocorrelation; Binary phase shift keying; Digital signal processing; Least squares methods; Modulation; Nonlinear filters; Performance analysis; Quadrature phase shift keying; Signal processing; Speech;
