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| A Distribution-Function-Based AGC Method in OFDM Systems |
| Zhang Xiao-xin① Zou Li② Zhao Yu-ping① |
| ①(School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China) ②(Thomson Broadband R & D (Beijing) Co. Ltd., Beijing 100085, China) |
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Abstract In Orthogonal Frequency Division Multiplexing (OFDM) systems, there are large estimate errors of the received power in a traditional Automatic Gain Control (AGC). This paper proposes a distribution-function-based AGC method. This method estimates the received power by using the distribution function of the output signal from the Analog to Digital Converter (ADC), and overcomes the clipping effect introduced by the ADC. Simulation results demonstrate that, in OFDM systems, only after one time estimate, the proposed AGC method achieves less than 0.23dB estimate error, whereas the traditional AGC method provides less than 9dB estimate error. Therefore, the proposed AGC method estimates the received power more accurately, and increases greatly the system performance.
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Received: 12 April 2007
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Corresponding Authors:
Zhang Xiao-xin
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2008, Vol. 30 
