A joint adaptive carrier and symbol synchronization method for qpsk signals

An adaptive, signal technology, applied in the modulation carrier system, digital transmission system, electrical components and other directions, can solve the problem of single loop parameter setting, QPSK signal can not take into account the synchronization speed and synchronization accuracy, etc., to improve synchronization accuracy, reduce Difficulty, the effect of increasing the synchronization speed

Active Publication Date: 2022-03-08
HARBIN INST OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the single loop parameter setting of the existing joint synchronization method, especially for the problem that the QPSK signal with a large deviation cannot take into account the synchronization speed and synchronization accuracy, and proposes an adaptive carrier of the QPSK signal and Symbolic Union Synchronization Method

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  • A joint adaptive carrier and symbol synchronization method for qpsk signals
  • A joint adaptive carrier and symbol synchronization method for qpsk signals
  • A joint adaptive carrier and symbol synchronization method for qpsk signals

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[0052] The technical solutions in the embodiments of the present invention will be described in conjunction with the accompanying drawings in which the drawings in the embodiments of the present invention will be described, and it is clearly, and the described embodiments are merely embodiments of the invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art are in the range of the present invention without making creative labor premise.

[0053] Combine Figure 2-4 The present invention proposes an adaptive carrier and symbol combined synchronization method of the QPSK signal, and specifically includes the following steps:

[0054] Step 1: Determine the input signal of the adaptive carrier and symbol combined with the synchronous loop, the input signal being the QPSK digital intermediate frequency signal;

[0055] Step 2: The input signal obtains two QPSK baseband signals I (N) and...

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Abstract

The present invention proposes an adaptive carrier and symbol joint synchronization method of a QPSK signal, said method comprising determining an input signal, obtaining two mutually orthogonal QPSK baseband signals, and calculating the baseband signal by using a phase detector and a Gardner timing error detector respectively Carrier phase error signal and timing phase error signal, calculate the characteristic value and divide the synchronization process into three stages: coarse synchronization stage, transition stage and fine synchronization stage, identify the current synchronization stage and select the corresponding loop filter, The signal is rectified and the final decision signal is output. The method of the invention can effectively improve the two technical indexes of the synchronization speed and the synchronization precision of the synchronization loop at the same time, especially the improvement of the synchronization effect of the QPSK signal with large deviation is more obvious.

Description

Technical field [0001] The present invention belongs to the technical field of wireless communication, and is specifically applied to a digital receiver, particularly an adaptive carrier and symbol combined synchronization method of the THE QUADRATURE PHASE SHIFT KEYING, QPSK. Background technique [0002] Carrier synchronization and symbol synchronization in the digital receiver are proposed in the 1980s. In 2014, Huajie and its research team conducted organic combination of classic COSTAS carrier synchronous loops and Gardner symbol synchronous loops to form a joint synchronous loop. Its proposed combine synchronous loop is divided into two parts: CostaS carrier synchronization and Gardner symbol synchronization. The flow of the signal processing is as follows: The digital intermediate frequency signal first enters the COSTAS carrier synchronization loop, and the output of the pulse type filter directly inputs the interpolation filter, enters the Gardner symbol synchronization ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2663H04L27/2665H04L27/2659H04L27/266
Inventor 杨智明季鑫宋志一孙谋迅刘旺乔立岩张峰
Owner HARBIN INST OF TECH
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