Frequency offset estimation algorithm for π/4-DQPSK TDMA mobile radio

Author

Joung, Jinsoup ; Stuber, Gordon L.

Author_Institution

Georgia Inst. of Technol., Atlanta, GA, USA

Volume

49

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

1885

Lastpage

1892

Abstract

This paper presents a new frequency offset estimation algorithm that uses an indicator of the channel status called the uncertainty factor (UF). The UF is calculated for the burst of interest and used to determine if the frequency offset estimate should be updated. If so, then a number of temporary frequency offset estimates are averaged together to obtain an updated frequency offset estimate. Computer simulations show that the UF is inversely related to carrier-to-interference ratio, and directly related to the frequency selectivity and Doppler frequency of the channel. The new frequency offset estimation algorithm is shown to significantly outperform conventional methods

Keywords

differential phase shift keying; frequency estimation; land mobile radio; quadrature phase shift keying; time division multiple access; π/4-DQPSK TDMA mobile radio; Doppler frequency; carrier-to-interference ratio; channel status; frequency offset estimation algorithm; frequency selectivity; uncertainty factor; Decision feedback equalizers; Doppler shift; Fading; Frequency estimation; Frequency synchronization; Land mobile radio; Maximum likelihood estimation; Receivers; Time division multiple access; Uncertainty;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/25.892591

Filename

892591