Volume 4 Number 2 (Apr. 2014)
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IJEEEE 2014 Vol.4(2): 82-86 ISSN: 2010-3654
DOI: 10.7763/IJEEEE.2014.V4.307

Digital Auto Frequency Control for a General Purpose IF Subsystem with Multi-Modulation Schemes

X. Chen and H. Zhang
Abstract— This paper presents a general purpose auto-frequency control (AFC) algorithm for wireless communication systems with multi data rate and multi modulation schemes, such as FSK, GFSK, and MSK, etc. The proposed algorithm is a non-decision-aided recursive closed-loop which does not require timing recovery and permits wider tracking range. By implementing an adaptive loop gain control, the proposed AFC can achieve a higher tracking speed as well as better performance. A novel normalization scheme based on digital RSSI and bit shifting /truncation is also included to remove the effects on the estimated carrier frequency offset (CFO) by the gains and distortions all along the receiving path, such as inter-channel interference (ICI) and Auto-Gain Control (AGC) uncertainties which are not taken into consideration in most of the existing references.

Index Terms— Adaptive AFC, CFO, RSSI, synchronization, normalization.

X. Chen and H. Zhang are with Institute of Microelectronics, A*STAR, Singapore (e-mail: {chenx, zhanghb}@ime.a-star.edu.sg).

Cite: X. Chen and H. Zhang, " Digital Auto Frequency Control for a General Purpose IF Subsystem with Multi-Modulation Schemes," International Journal of e-Education, e-Business, e-Management and e-Learning vol. 4, no. 2, pp. 82-86, 2014.

General Information

ISSN: 2010-3654 (Online)
Abbreviated Title: Int. J. e-Educ. e-Bus. e-Manag. e-Learn.
Frequency: Quarterly
Editor-in-Chief: Prof. Kuan-Chou Chen
Executive Editor: Ms. Nancy Lau
Abstracting/ Indexing: EBSCO, Google Scholar, Electronic Journals Library, QUALIS, ProQuest, INSPEC (IET)
E-mail: ijeeee@iap.org
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