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16QAM carrier demodulation loop locking state synchronous detection method

A technology of locked state and synchronous detection, applied in multi-carrier systems, modulated carrier systems, digital transmission systems, etc., can solve problems such as judgment failure, achieve high accuracy, simple circuit structure, and avoid judgment failure.

Active Publication Date: 2019-10-08
10TH RES INST OF CETC
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to aim at the defect that the traditional 16QAM carrier lock detection method may cause judgment failure when the input signal constellation points do not obey the uniform distribution. Synchronous Detection Method of 16QAM Carrier Demodulation Loop Locked State Based on Adaptive Threshold in Digital Domain

Method used

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  • 16QAM carrier demodulation loop locking state synchronous detection method
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  • 16QAM carrier demodulation loop locking state synchronous detection method

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Embodiment Construction

[0017] refer to figure 1 . According to the present invention, construct the lock state detection module of a carrier loop lock detector in the 16QAM demodulation module, the input of the lock state detection module is the 16QAM signal after carrier synchronization and bit synchronization, and the bit synchronization and carrier synchronization The 16QAM signal takes a piece of data and sends them to the I and Q data storage modules respectively, and then sends them to the adaptive threshold adjustment module and the normalized signal high-order moment calculation module; the adaptive threshold adjustment module counts the data of each constellation point The distribution number is dynamically adjusted to the threshold through the distribution of each constellation point; the carrier synchronization lock detection loop compares the normalized higher-order moment calculation value with the threshold value output by the threshold adjustment module at each moment, and normalizes ...

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Abstract

The invention provides a 16QAM (Quadrature Amplitude Modulation) carrier demodulation loop locking state synchronous detection method. The 16QAM carrier demodulation loop locking state synchronous detection method can be used for remarkably improving the accuracy of 16QAM carrier locking indication. According to the technical scheme, a locking state detection module takes a segment of data from a16QAM signal subjected to bit synchronization and carrier synchronization and sends the data to an I data storage module and a Q data storage module respectively, and then the data is sent to an adaptive threshold adjustment module and a normalized signal high-order moment calculation module respectively; the self-adaptive threshold adjustment module counts the data distribution number of each constellation point and performs threshold adjustment in a self-adaptive manner according to the distribution condition; and the normalization signal high-order moment calculation module calculates normalization high-order moments of the I and Q signals output by the I and Q data storage modules, sends an output metric value to the comparator, compares the output metric value with a threshold value which is adaptively adjusted, judges the locking state of the 16QAM carrier wave loop, and outputs a carrier wave locking indication state.

Description

technical field [0001] The invention relates to a 16QAM carrier demodulation loop locking state synchronous detection method based on an adaptive threshold in the field of wireless communication, in particular to a detection method for synchronous locking detection of the carrier demodulation loop locking state in a 16QAM digital demodulator. [0002] technical background [0003] With the continuous development of aviation and aerospace technology, the process of human exploration and development of space is accelerating, the types of satellite payloads and the types of services carried are also increasing, and the amount of information that needs to be transmitted is also increasing. In order to transmit this information to the ground command center, the data transmission rate requirements are getting higher and higher. In order to effectively transmit more data in a limited bandwidth channel, various modulation methods have been developed to solve the contradiction between...

Claims

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Application Information

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IPC IPC(8): H04L27/34H04L27/38H04L27/26
CPCH04L27/2657H04L27/34H04L27/3818
Inventor 刘洋杜瑜
Owner 10TH RES INST OF CETC
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