A simple self-adaptive improvement method of a timing error discriminator

A timing error and discriminator technology, applied to electrical components, transmission systems, etc., can solve problems such as out-of-lock divergence, bit timing tracking loop instability, etc., and achieve the effect of enhancing robustness

Active Publication Date: 2019-05-21
SHANGHAI HUACE NAVIGATION TECH
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Problems solved by technology

[0003] A typical Gardner timing error estimation algorithm uses symbol waveform detection to obtain bit timing deviation information, which makes the estimated value affected by symbol waveform shape and signal strength, too large or too small will cause bit timing tracking loop failure Unstable, even leading to out-of-lock divergence, so this typical algorithm is more sensitive to signal strength

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  • A simple self-adaptive improvement method of a timing error discriminator
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  • A simple self-adaptive improvement method of a timing error discriminator

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Embodiment 1

[0027] Embodiment 1, with reference to Figure 2-Figure 3 As shown, a kind of simple self-adaptive improvement method of the Gardner bit timing error discriminator of the present invention comprises: the loop convergence stage: still in the convergence process in the loop of this stage, it means that the symbol decision sampling moment at this moment is not Accurate, and it is impossible to know exactly where the symbol peak time is. The peak estimation at this stage can be approximately replaced by the maximum value of the sequence of sampled values ​​over a period of time. Due to intersymbol interference, the symbol waveform peak value is not the maximum value in the entire wave sequence. The specific implementation process of this stage is: sampling the symbol waveform at a higher sampling rate and obtaining the sampling sequence {x(k)} k＝1,2,3... , and input the sampling sequence to window decimator 1 and interpolator 3 respectively. A higher sampling rate can obtain mo...

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Abstract

The invention provides a simple self-adaptive improvement method of a timing error discriminator, which is characterized by comprising the following steps of: (1) a loop convergence stage; Step (2), aloop stable tracking stage: the robustness of the loop to the signal intensity change is enhanced by utilizing simple normalization processing, and meanwhile, the direct estimation of a real error isalso obtained; And the treatment is simple, so that the method has very high feasibility in engineering practice.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a simple self-adaptive improvement method for a Gardner bit timing error discriminator. Background technique [0002] In a digital communication system, the signal transmission delay and the clocks at both ends of the transceiver are not synchronized, resulting in the need to recover bit timing information at the receiving end to ensure good bit error performance of the communication system. Bit synchronization technology is the key technology to realize this requirement, among which Gardner bit synchronization algorithm is a classic digital timing synchronization control method. The method utilizes a similar phase-locked loop technology to track and lock the bit timing moment in real time by means of a loop, and bit timing error estimation is an important link. [0003] A typical Gardner timing error estimation algorithm uses symbol waveform detection to obtain bit timing d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7085H04B1/7075H04B1/7093
Inventor 朱魁华解忙忙韩孟飞张玉清石字桔付雪云赵健陈光尧
Owner SHANGHAI HUACE NAVIGATION TECH
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