Journal of East China Normal University(Natural Sc

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Sampling clock synchronization for OFDM based software-defined radio receivers

XIE Ying[1], HU Xing-bo[1], XU Wei-yang[2]   

  1. 1. School of Information Science and Technology, East China Normal University, Shanghai 200241, China;
    2. College of Communication Engineering, Chongqing University, Chongqing 400044, China
  • Received:2015-08-26 Online:2016-11-25 Published:2017-01-13


The sampling clock error in an OFDM (Orthogonal Frequency Division Multiplexing) receiver will severely degrade the overall system performance. Based on the canonical Gardner loop, a novel sampling clock synchronization scheme suitable for OFDM based software-defined radio (SDR) receivers is proposed, which uses a joint recursive algorithm to track the error and then corrects it by performing asynchronous resampling on the received signal. The proposed error detection method can improve estimation efficiency by eliminating effects of the carrier frequency error while sustaining the loop’s dynamic performance. A dynamic delay technique is devised to control the resampling process, which can smoothly adjust the incoming data stream without sampling disturbance. Theoretical analysis and simulation results indicate that the proposed scheme outperforms other techniques and works well in the multipath channel.

Key words: OFDM, SDR receiver, sampling clock synchronization, error detection, resampling