Earticle

초록

영어

In the OFDM (Orthogonal Frequency Division Multiplexing) system, the fast synchronization is required which in general could be achieved using the preamble located in the header part of the data packet. The modulated and transmitted signal experiences the frequency selective fading due to the multipath channel. As the recent OFDM systems have been applied to the various application areas, the coverage increases which can be translated into the wide range of the signal power variation observed at the receiver side. To obtain the optimum signal level the gain control block at the receiver front-end should be capable of processing wider range of the signal power than the conventional systems. If the signal power is not controlled properly, the overall system performance is expected to be deteriorated due to the quantization errors generated in the process of the analog to digital signal conversion. Therefore it is required to control the received signal power at the optimum level. In this paper, the gain control block is implemented based on the FPGA (Field Programmable Gate Array) hardware. The implemented block adopts multiple gain steps which are optimized by using the statistical characteristics of the quantized signal at the ADC (Analog to Digital Converter) output. The proposed design is shown to provide the enhanced convergence speed and reduced processing time while the hardware complexity is increased marginally compared with the conventional system.

목차

Abstract
 1. Introduction
 2. Gain Control for the OFDM Signal Frame
 3. Implementation of AGC with Multiple Gain Loops
 4. Simulation
 5. Conclusion
 Acknowledgements
 References

키워드

저자

• Jihye Lee [ Seoul National University of Science and Technology, Dept. of Electrical and Information Engineering, 232 Gongneung-ro, Nowon-Gu ]
• Taehyun Jeon [ Seoul National University of Science and Technology, Dept. of Electrical and Information Engineering, 232 Gongneung-ro, Nowon-Gu ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  International Journal of Control and Automation

• 간기

  월간

• pISSN

  2005-4297

• 수록기간

  2008~2016

• 십진분류

  KDC 505 DDC 605