A use of instantaneous frequency estimators for radio signals identification

Identification of digitally modulated radio signals is one of the essential problems in intelligent radio links and radio monitoring systems. FSK signals are widely used for this purpose. An estimated instantaneous frequency (IF) can be used as one of the identification parameters. LPC and DESA estimators for real signals are compared to frequency estimators obtained for complex signals. Autoregressive models are proposed as a method of precise estimation of time-varying frequency in a noisy environment. A hardware solution for radio signal acquisition in complex form is also presented