Mean Time to Loss of Lock and Average Switching Rate of an Automatic Frequency Control Loop with an Interferer and Noise in a Fading Channel

Author

Emad, Amin ; Beaulieu, Norman C.

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Alberta, Edmonton, AB, Canada

fYear

2009

fDate

14-18 June 2009

Firstpage

1

Lastpage

6

Abstract

The performance of an automatic frequency control (AFC) loop in a noisy fading channel when an interference signal is present at the input of the AFC is studied. Independent non-identically distributed (i.n.d.) channels with Rayleigh and Rician fading are considered. The received signals are assumed to be narrowband and linearly modulated while the analysis is applicable to the unmodulated scenario as well. Closed-form expressions and integral form formulas are derived for the mean time to loss of lock (MTLL) and the average switching rate (ASR) of an AFC. Numerical examples are provided to illustrate the effects of noise and slow fading on the performance of an AFC in the presence of an interferer. It is shown that in some scenarios, an AFC has a better performance if the desired signal is corrupted by more noise.

Keywords

Rayleigh channels; Rician channels; automatic frequency control; interference (signal); telecommunication control; Rayleigh fading; Rician fading; automatic frequency control loop; average switching rate; independent nonidentically distributed channels; interference signal; mean time-to-loss; noisy fading channel; Automatic frequency control; Automatic speech recognition; Closed-form solution; Fading; Filters; Interference; Phase locked loops; Rician channels; Signal generators; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2009. ICC '09. IEEE International Conference on

Conference_Location

Dresden

ISSN

1938-1883

Print_ISBN

978-1-4244-3435-0

Electronic_ISBN

1938-1883

Type

conf

DOI

10.1109/ICC.2009.5199173

Filename

5199173