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A Carrier Frequency Offset Adjustment Method

An adjustment method and carrier frequency offset technology, applied in carrier adjustment, modulation carrier system, advanced technology, etc., can solve problems such as demodulation failure, pulse misjudgment, etc., achieve less resource consumption, widen frequency tolerance value, and design ability strong effect

Active Publication Date: 2020-03-20
ZTE INTELLIGENT IOT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, when the device is in a complex environment, if the frequency is greatly shifted, it may cause misjudgment of the pulse, resulting in demodulation failure
Therefore, it has certain limitations when used in special environments

Method used

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  • A Carrier Frequency Offset Adjustment Method

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Embodiment Construction

[0023] It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no conflict.

[0024] Hereinafter, the present invention will be described in detail with reference to the drawings and in conjunction with the embodiments.

[0025] The specific embodiment of the present invention is to design a high dynamic range in-phase quadrature digital phase-locked loop according to the method of the present invention, which can realize the carrier extraction of the full-rate reverse received signal in a complex environment, and realize the accuracy of the received signal demodulation.

[0026] The following are the design steps of a high dynamic range in-phase quadrature digital phase-locked loop: figure 1 Shown

[0027] (1) The input symbol signals of channel I and channel Q first enter the integrator of each channel for corresponding integration and detection of zero-crossing points to determine the direction...

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Abstract

The invention provides a carrier frequency deviation adjustment method used for digital carrier recovery at the front end of a digital signal processing system of a receiving end. A same-phase orthonormal type digital phase-locked loop technology is adopted, two signals are subjected to integration to acquire a zero cross point, data selection is performed according to signal amplitude, frequency tolerance under different frequencies is calculated, the tolerable frequency range is calculated, and frequency deviation adjustment is performed by adjusting the number of sample points in real time. With the method, simpleness in structure and flexibility in design are achieved, few resources are consumed, frequency deviation adjustment can be performed simultaneously with digital carrier recovery, and high adaptability in frequency deviation under ultralow temperature or ultrahigh temperature environments.

Description

Technical field [0001] The invention belongs to the technical field of wireless communication synchronization, and particularly relates to a carrier frequency offset adjustment method. Background technique [0002] There are many types of digital carrier recovery circuits in wireless communication, the most commonly used are square loop, costas loop (in-phase quadrature loop), decision feedback loop, and general carrier recovery loop. [0003] The Costas loop is a closed-loop automatic adjustment system. The traditional analog Costas loop has a certain impact on the performance of the loop due to the imbalance between the in-phase branch and the quadrature branch, and the analog circuit also has DC zero drift, It is difficult to debug and other shortcomings, but the use of all-digital implementation can effectively avoid these problems. [0004] Digital Costas ring bit synchronization decoding actually uses the principle of negative feedback to detect the zero-crossing point based o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026Y02D30/50
Inventor 朱琳琳陈冬
Owner ZTE INTELLIGENT IOT TECH