Automatic frequency correcting method for time-division wireless communication system

Automatic frequency correcting method for time-division wireless communication system

  • CN 1,607,787 A
  • Filed: 07/28/2003
  • Published: 04/20/2005
  • Est. Priority Date: 07/28/2003
  • Status: Active Grant
First Claim
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1. , a kind of automatic frequency correcting method of receiver of time-division wireless communication system comprises and obtains a training data sequence pattern and fine frequency correction;

  • Described fine frequency is proofreaied and correct and is constantly carried out frame by frame based on plurality of continuous or discontinuous frame, begins up to lock-out or once new automatic frequency correction, and it comprises the steps;

    each timeExtraction is corresponding to the reception data of described training data sequence part;

    Channel estimating and route searching obtain amplitude and phase information in corresponding each channel delay tap in a collection of present frame, and select some active paths according to the channel estimation results of present frame and former some frames;

    According to described channel estimation value and Path selection result, the reception data corresponding to training data sequence part on some the described active paths are carried out maximum ratio merge, carry out relevant with the training data sequence then;

    Output sequence according to described path merges and correlation step obtains carries out a Frequency offset estimation and obtains the Frequency offset estimation value;

    Signal to Interference plus Noise Ratio is estimated, obtains the Signal to Interference plus Noise Ratio estimated result in the present frame;

    According to described Signal to Interference plus Noise Ratio estimated result, the kalman gain factor of computing application Frequency offset estimation in present frame;

    According to the described Frequency offset estimation value and the kalman gain factor, carry out first-order loop filtering and obtain cumulative frequency skew estimated value;

    Described cumulative frequency skew estimated value is controlled the output frequency of local oscillator.

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