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Joint Estimation of Power and DC Offset for OFDM Systems Based on Distribution Function

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Abstract

In orthogonal frequency division multiplexing (OFDM) systems, the estimate errors of automatic gain control (AGC) and DC estimation (DCE) are larger than in single carrier systems. It is due to the fact that OFDM signals have Gaussian distributions. Consequently, estimate errors will occur in the AGC and the DCE because of the truncating effect generated by the analog-to-digital converter (A/D). In addition, the AGC and the DCE will interfere with each other when operated independently. In this paper, we analyze the estimate errors of the conventional AGC and DCE method in OFDM systems. We then propose the joint AGC-DCE method which performs the AGC and the DCE at the same time. The proposed method uses the distribution function of OFDM signals, and overcomes the truncating effect of the A/D and the interference between the signal power and the DC offset. In addition, we propose an enhanced AGC-DCE method which combines the proposed method with the conventional DCE so as to further reduce estimate errors. Simulation results verify that, the enhanced method estimates the signal power and the DC level more accurately than the conventional method. If the same estimate errors are reached, the estimate delay of the enhanced method can be only 1/4 of that of the conventional one.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Optical Communication Systems & Networks, School of Electronics Engineering and Computer Science, Peking University, 100871, Beijing, People’s Republic of China

    Xiaoxin Zhang & Yuping Zhao

  2. Thomson Broadband R&D (Beijing) Co. Ltd, 100085, Beijing, People’s Republic of China

    Li Zou

Authors
  1. Xiaoxin Zhang
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  2. Yuping Zhao
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  3. Li Zou
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Correspondence to Yuping Zhao.

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Zhang, X., Zhao, Y. & Zou, L. Joint Estimation of Power and DC Offset for OFDM Systems Based on Distribution Function. Wireless Pers Commun 56, 733–744 (2011). https://doi.org/10.1007/s11277-009-9843-8

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  • DOI: https://doi.org/10.1007/s11277-009-9843-8

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