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A method and device for detecting the frequency locking state of qpsk signal

A technology of locking state and signal frequency, applied in the direction of synchronization device, digital transmission system, electrical components, etc., can solve the problem of reducing the performance of the receiver

Active Publication Date: 2020-07-10
CHENGDU KSW TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, it is very important for the normal operation of the receiver to correctly and timely judge whether the frequency-locked loop is working in the locked state. Once the locked state of the frequency-locked loop is judged wrongly, the performance of the receiver will be reduced overall

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  • A method and device for detecting the frequency locking state of qpsk signal
  • A method and device for detecting the frequency locking state of qpsk signal
  • A method and device for detecting the frequency locking state of qpsk signal

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Embodiment Construction

[0034] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0035] Such as figure 2 Shown, the method that the present invention detects QPSK signal frequency locking state, it may further comprise the steps:

[0036] Step 1: According to the input signal r at time n n , calculate the intermediate variable I′ n and Q′ n ;and,

[0037] r n = I n +jQ n

[0038] I' n = I n 2 -Q n 2

[0039] Q' n = 2I n Q n

[0040] Among them, I n and Q n are the input signal r n The in-phas...

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Abstract

The invention discloses a method and a device for detecting a frequency locking state of a QPSK signal. The method comprises the following steps: based on an input signal, calculating intermediate variables, next, according to the intermediate variable, calculating a point product quantity and a difference product quantity according to a judgment threshold, calculating a frequency locking measurement value according to the point product quantity and the difference product quantity, finally, calculating an average value of the frequency locking measurement value, comparing the average value ofthe frequency locking measurement value with the judgment threshold, if the average value is greater than or equal to the judgment threshold, enabling the frequency locking loop to be in a locked state, otherwise, enabling the frequency locking loop to be in an unlocked state. Therefore, by judging the magnitude relation between the average value of the set frequency locking metric values and thejudgment threshold, the unlocking state of the frequency locking ring can be quickly and accurately judged.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and device for detecting the frequency locked state of a QPSK signal, which is usually applied to indicate the frequency locked state of a QPSK signal frequency locked loop. Background technique [0002] In wireless communication technology, the recovery and tracking of the carrier is the key to demodulation. In a highly dynamic environment, carrier synchronization requires a rough capture of the carrier signal by the frequency-locked loop, and the carrier frequency is pulled to the linear operation of the phase-locked loop. Within the range, the phase-locked loop is used to accurately track the signal, and then the synchronization of the carrier signal is realized. [0003] Such as figure 1 The traditional frequency-locked loop tracking loop shown is usually composed of digital NCO, integral cleaner (I-D), frequency discriminator, digital loop fi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/227H04L7/033
CPCH04L7/033H04L27/2272
Inventor 王维李文军张吉林沈亮
Owner CHENGDU KSW TECH