Frame synchronization method capable of resisting single-frequency interference

A single-frequency interference and frame synchronization technology, applied in multi-frequency code systems, shaping networks in transmitters/receivers, baseband system components, etc., can solve problems such as large delays, and achieve the effect of saving hardware resources

Active Publication Date: 2013-10-02
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires additional FFT and ...

Method used

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  • Frame synchronization method capable of resisting single-frequency interference
  • Frame synchronization method capable of resisting single-frequency interference
  • Frame synchronization method capable of resisting single-frequency interference

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Assume that the frequency domain is used to define the ZC sequence as the synchronization sequence, and the ZC sequence is defined as follows:

[0073] When Nzc is odd:

[0074] a q = exp [ - j 2 πq n ( n + 1 ) / 2 + ln Nzc ]

[0075] When Nzc is even:

[0076] a q = exp [ - j 2 πq n 2 / 2 + ln Nzc ]

[0077] Among them, N zc Indicates the length of the ZC sequence...

Embodiment 2

[0081] Following example 1, use such as image 3 The frame synchronization method shown, wherein the normalized LMS adaptive filter filtering process is as follows:

[0082] the y k =W k H x k-1

[0083] ε k = d k -y k

[0084] W k + 1 = W k + u 0 | | X k - 1 | | 2 ϵ k * X k - 1

[0085] Among them, yk is the kth output of the filter, ε k Output y for the kth time k and the ideal output value d ...

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Abstract

The invention relates to a frame synchronization method capable of resisting single-frequency interference. A sending end is used for adding frame synchronization sequence to a frame header of a physical layer frame, and a receiving end is used for setting a threshold value so as to judge whether a frame start position is detected. The method comprises the following steps: (1) passing a received signal through a low order normalized LMS (Least Mean Square) self-adapting filter; (2) subtracting the output of the low order normalized LMS self-adapting filter from the received signal, so as to obtain a corrected received signal; (3) performing mutual correlation computation of energy normalization to the corrected received signal and the local sequence, so as to obtain a correlation result of energy normalization; (4) comparing the obtained correlation result of energy normalization with the preset threshold value, so as to obtain the start position of the physical layer frame. The method can accurately estimate the start position of the physical layer frame in presence of great single-frequency interference. Therefore, the hardware resource cost is saved, and the system real-time performance is not affected.

Description

technical field [0001] The invention belongs to the technical field of digital communication, and specifically relates to a frame synchronization method using a low-order normalized LMS (Least Mean Square, minimum mean square error) adaptive filter. Even when there is interference, the frame start position can still be accurately estimated. Background technique [0002] In a burst communication system, in order to accurately obtain the transmission time of the physical layer frame, the receiving end needs to use part of the information in the received signal to estimate the starting time of the received physical layer frame. Synchronization process. Using the correlation method to synchronize is the method of most communication systems. Its basic method is to add some specific sequences to the transmitted signal, and perform correlation operations on these sequences at the receiving end. A series of correlation values ​​to form a correlation sequence (correlation window is...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/03
Inventor 费永强赵辉祁晓霞赵玉萍李斗李红滨
Owner PEKING UNIV
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