Title :
Co-channel interference rejection using a model-based demodulator for AMPS and NAMPS
Author :
Welborn, Matthew L. ; Reed, Jeffrey H.
Author_Institution :
Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
Co-channel interference is a major problem that limits the cell capacity in AMPS systems. For a digital implementation of an AMPS receiver, a quadrature demodulator would typically be used. This paper details the development of a demodulator that uses model-based frequency estimation to demodulate the frequency-modulated AMPS signal. This new technique shows improved performance in the presence of cochannel interference. Additionally, this technique has been used to develop a class of extensions for a conventional quadrature demodulator that provide improved performance in the presence of channel noise
Keywords :
cellular radio; cochannel interference; demodulation; demodulators; digital radio; frequency estimation; frequency modulation; interference suppression; land mobile radio; radio receivers; radiofrequency interference; AMPS receiver; NAMPS; cell capacity; cellular radio; channel noise; cochannel interference rejection; demodulation; digital implementation; frequency modulated AMPS signal; model based demodulator; model based frequency estimation; performance; Computer simulation; Demodulation; Frequency conversion; Frequency estimation; Frequency modulation; IIR filters; Interchannel interference; Parametric statistics; Phase locked loops; Receivers;
Conference_Titel :
Vehicular Technology Conference, 1996. Mobile Technology for the Human Race., IEEE 46th
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3157-5
DOI :
10.1109/VETEC.1996.501525
