A method for estimating out-of-symbol delay

Abstract

The present invention provides a method of estimating an out-of-symbol delay. The method comprises: for a transmitting signal sequence, calculating the angular difference information between unique word sequence symbols and obtaining the angular difference information between the unique word sequence symbols of a transmitting end; for a receiving signal sequence, by using a sliding window method and according to different sliding window values, extracting a plurality of candidate unique word sequences corresponding to the unique word sequence of the transmitting end and calculating the angulardifference information between the symbols of each candidate unique word sequence; calculating the distance between the angular difference information between the symbols of each candidate unique word sequence and the angular difference information between the unique word sequence symbols of the transmitting end; selecting the sliding window value of the corresponding candidate unique word as theestimated value of the out-of-symbol delay based on the calculated distance. The method of the present invention can improve the estimation accuracy of the out-of-symbol delay.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for detecting a unique code type and a method for detecting an extra-symbol time delay. Background technique [0002] In a wireless communication system, there is a complete communication process between the sending end and the receiving end of the communication, see figure 1 As shown, first, the sending end performs baseband modulation on the original information to be transmitted to achieve the purpose of transmitting as much information as possible with the smallest possible bandwidth, and sends it out by pulse shaping; in the channel, due to noise and other reasons, the signal delay will be caused , frequency offset and phase shift, etc.; the receiving end eliminates intersymbol interference through matched filtering, and then performs channel estimation (such as delay estimation, frequency estimation and phase estimation, etc.), compensation (such as timing c...

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Problems solved by technology

[0004] In the prior art, the method of UW type detection and extra-symbol delay estimation usually uses a sliding window to find the correlation peak for the corresponding position of the local UW and the received sequence, and completes UW type detection and symbol extra-symbol delay estimation according to the position of the correlation peak, but this This method is greatly affected by frequency offset, phase shift and noise, and this effect is accumulated along with the symbols. Therefore, the existing method obtains an estimated The large error of the value will cause the signal to not be demodulated correctly, and may even cause communication interruption, especially when transmitting burst signals, the traditional method has great limitations and cannot meet the communication requirements. This is due to the burst signal time Short, bursty, low signal-to-noise ratio

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