Data Symbol Synchronization Method Based on All-pass Fractional Delay Filter

A data symbol and fractional time delay technology, applied in the field of communication, can solve problems such as difficult symbol accurate bit synchronization, small spectrum coverage, complex filter structure, etc., to achieve simple structure, large spectrum coverage, and reduce system complexity Effect

Active Publication Date: 2021-04-23
BEIJING INST OF RADIO MEASUREMENT
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Problems solved by technology

However, in the current Gardner algorithm, the cubic Lagrangian polynomial interpolation filter based on the Farrow structure is mostly used to achieve phase adjustment, which has the characteristics of complex filter structure, large amount of calculation, small spectrum coverage, and it is not easy to implement under high-complexity conditions. Disadvantages of sign-accurate bit synchronization of the

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  • Data Symbol Synchronization Method Based on All-pass Fractional Delay Filter

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[0017] The principles and features of the present invention will be described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0018] Such as figure 1 As shown, it is a schematic flow chart provided for an embodiment of the data symbol synchronization method of the present invention, the method includes:

[0019] S1. Perform preprocessing on the digital intermediate frequency signal received by the receiver to obtain multiple sampling points of data symbols.

[0020] It should be noted that the preprocessing of digital intermediate frequency signals includes basic processing processes such as digital down-conversion processing, low-pass filtering processing, and down-sampling processing. Through digital down-conversion processing and low-pass filtering processing, digital intermediate frequency signals can be converted into The digital...

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Abstract

The invention discloses a data symbol synchronization method based on an all-pass type fractional delay filter, and relates to the communication field. Including: preprocessing the digital intermediate frequency signal received by the receiver to obtain multiple sampling points of the data symbol; estimating the difference between the peak point of the data symbol and all the sampling points to obtain the estimation result; calculating the all-pass type according to the estimation result The coefficient of the fractional delay filter; according to the coefficient, all the sampling points of the data symbol are filtered, and the sampling value at the peak sampling point of the data symbol is used as the synchronization symbol value; the synchronization of the data symbol is completed according to the synchronization symbol value. The data symbol synchronization method provided by the invention significantly reduces system complexity, improves performance, and does not require hardware improvement on existing signal receiving equipment, and has strong practicability.

Description

technical field [0001] The invention relates to the communication field, in particular to a data symbol synchronization method based on an all-pass fractional time delay filter. Background technique [0002] In the field of digital communication, the continuous phase modulation signal receiving system needs to accurately determine the start and end time of each data symbol, that is, to complete the precise bit synchronization of the data symbol, in order to complete the accurate extraction and recovery of the transmitted data and ensure the signal demodulation performance. [0003] At present, data symbols are mainly synchronized through the Gardner bit synchronization technology. The principle is to use a closed-loop feedback algorithm based on phase-locked loop technology to achieve high-performance bit synchronization with low complexity. However, in the current Gardner algorithm, the cubic Lagrangian polynomial interpolation filter based on the Farrow structure is mostly...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2662
Inventor 阮航钟明邬剑铭易晓丽
Owner BEIJING INST OF RADIO MEASUREMENT
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