NDLI: Analysis and implementation of digital automatic gain control for DAB baseband decoder

Content Provider	IEEE Xplore Digital Library
Author	Hongsheng Zhang Guoyu Wang Mingying Lu
Copyright Year	1975
Abstract	Digital Audio Broadcasting (DAB) receiver requires fast Automatic Gain Control (AGC) to compensate the strength loss due to the multipath propagation in mobile receiving condition. But fast AGC could also incorrectly amplify DAB's null symbol and the following phase reference symbol to cause the synchronization problem. In this paper, we mathematically analyze the AGC circuit under a Rayleigh fading channel and give the basic rule to generate the AGC feedback voltage. Then a fast and high accuracy AGC algorithm with least affection on the DAB null symbol is proposed. The algorithm is simplified to have only add, shift and compare operations, making it easy for hardware and software implementation. Finally the algorithm is simulated and verified on Field Program Gate Array (FPGA) device. The test results show that the proposed AGC algorithm can be settled within 0.5 ms, and keep the received signal stable at a moving speed from stationary to over 120 km/h, both in city and suburban area. The algorithm and the analysis method can also be used for AGC design in other wireless systems.
Sponsorship	IEEE Consumer Electronics Society
File Size	1232073
File Format	PDF
ISSN	00983063
Volume Number	57
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Automatic generation control Gain control Rayleigh channels Receivers Pulse width modulation Mathematical model Rayleigh Fading Automatic Gain Control (AGC) Digital Audio Broadcasting (DAB) Orthogonal Frequency Division Multiplexing (OFDM) Pulse Width Modulation (PWM)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Media Technology

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