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http://dx.doi.org/10.7840/KICS.2012.37.6C.462

Two-stage Adaptive Digital AGC Method for SDR Radio  

Park, Jong-Hun (삼성탈레스 통신연구소 무선통신그룹)
Kim, Young-Je (삼성탈레스 통신연구소 무선통신그룹)
Cho, Jung-Il (삼성탈레스 통신연구소 무선통신그룹)
Cho, Hyung-Weon (삼성탈레스 통신연구소 무선통신그룹)
Lee, Young-Po (성균관대학교 정보통신공학대학 전자전기공학부)
Yoon, Seok-Ho (성균관대학교 정보통신공학대학 전자전기공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.37, no.6C, 2012 , pp. 462-468 More about this Journal
Abstract
In this paper, an adaptive digital automatic gain control(AGC) algorithm with two stages is proposed. AGC technique is crucial for mobile communication equipment because path loss in wireless channel and gain fluctuation in receiver front-end continuously change the received signal strength. Furthermore, adaptive criteria should be applied to the design of AGC algorithm in order to support many waveforms with one SDR communication device. With these reasons, a two-stage structure is proposed to satisfy both flexibility and adaptiveness. Compared with conventional method, it also requires shorter convergence time. Numerical results show that the gain value of variable gain amplifier(VGA) is converged within proper time and proposed scheme controls the input level of analog to digital converter(ADC) to be stable during long range of time.
Keywords
ADC; Digital AGC; Loopback Filter; SDR; Two-stage Adaptive AGC;
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