A novel AGC scheme for QAM demodulator applications

Author

Deng, Qing ; Wu, Jian-Hui ; Shi, Long-xing ; Sun, Wen ; Yun, Ting-Hua

Author_Institution

Res. Centre, Nat. ASIC Syst. Eng. & Technol., Southeast Univ., Nanjing

fYear

2007

fDate

12-15 Feb. 2007

Firstpage

1

Lastpage

4

Abstract

The performance of traditional approaches of automatic gain control (AGC) will be seriously degraded by intersymbol interference (ISI). This could result in slow convergence and possible instability problems. In this paper, we propose an equalizer-based AGC scheme to overcome the ISI interference and it uses the error signal of the equalizer output to control the AGC loop direction. Simulation results demonstrate good acquisition and tracking performances of the new scheme under large ISI circumstances. Our equalizer-based AGC is already silicon-proven for the application of QAM demodulator using charter 0.25 um cell libraries.

Keywords

automatic gain control; convergence; demodulators; equalisers; intersymbol interference; quadrature amplitude modulation; ISI; QAM demodulator; automatic gain control; convergence; equalizer-based AGC scheme; intersymbol interference; quadrature amplitude modulation; Automatic control; Convergence; Degradation; Demodulation; Equalizers; Error correction; Gain control; Intersymbol interference; Libraries; Quadrature amplitude modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing and Its Applications, 2007. ISSPA 2007. 9th International Symposium on

Conference_Location

Sharjah

Print_ISBN

978-1-4244-0778-1

Electronic_ISBN

978-1-4244-1779-8

Type

conf

DOI

10.1109/ISSPA.2007.4555287

Filename

4555287