Carrier frequency deviation adjustment method
A technology of carrier frequency offset and adjustment method, applied in the direction of carrier adjustment, modulation carrier system, transmission system, etc., can solve the problems of pulse misjudgment, demodulation failure, etc., to widen the frequency tolerance value, reduce resource consumption, widen the frequency range effect
Active Publication Date: 2017-05-31
ZTE INTELLIGENT IOT TECH
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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
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[0023] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0024] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0025] A 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 accurate detection of the received signal. demodulation.
[0026] The following are the design steps of the high dynamic range in-phase quadrature digital phase-locked loop: figure 1 shown
[0027] (1) The input symbol signals of the I channel and the Q channel first enter the integrator of each channel, perform corresponding integration and detect the zero-crossing point, and judge ...
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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 in particular relates to a carrier frequency offset adjustment method. Background technique [0002] There are many kinds of digital carrier recovery circuits in wireless communication, the most commonly used ones 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 performance of the traditional analog Costas loop is affected by the imbalance between the in-phase branch and the quadrature branch, and the analog circuit also has DC zero drift, Difficult to debug and other shortcomings, and the use of all-digital implementation can effectively avoid these problems. [0004] Digital Costas ring bit synchronous decoding actually adopts the principle of negative feedback to detect the zero-crossing point and judge the data directi...
Claims
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IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026Y02D30/50
Inventor 朱琳琳陈冬
Owner ZTE INTELLIGENT IOT TECH