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A coherent demodulation method, device and readable storage medium suitable for π/4-dqpsk

A technology of coherent demodulation and multiplication, applied in the field of mobile and satellite communications, can solve the problems of spectrum distortion and demodulation performance deterioration, and achieve the effect of reducing envelope fluctuation, good anti-noise characteristics, and good carrier tracking ability

Active Publication Date: 2021-11-05
南京天际易达通信技术有限公司
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[0004] Based on this, the embodiment of the present invention proposes a coherent demodulation method, device, and readable storage medium suitable for π / 4-DQPSK, which solves the problem of receiving and demodulating π / 4-DQPSK modulated signals in the prior art due to spectrum The problem of spectral distortion caused by the large envelope waveguide, and the problem of overcoming the degradation of demodulation performance caused by the increase of frequency difference

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  • A coherent demodulation method, device and readable storage medium suitable for π/4-dqpsk
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  • A coherent demodulation method, device and readable storage medium suitable for π/4-dqpsk

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[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0034] The appearances of the terms "comprising" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or modules is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units in...

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Abstract

The invention discloses a coherent demodulation method, device and readable storage medium suitable for π / 4-DQPSK. The method includes receiving sampling processing, two-way demodulation judgment and carrier loop tracking, and receiving π / 4-DQPSK from the sending end. 4-DQPSK modulates the radio frequency signal, and uses the orthogonal local carrier to perform I-channel demodulation processing and Q-channel demodulation processing with the digital intermediate frequency signal respectively. After the I-channel demodulation process is multiplied by the same phase π / 4 phase integer The result is combined with the result obtained by multiplying the quadrature π / 4 phase integer times in the Q-channel demodulation process for phase error detection, and after loop filtering, the local carrier is tracked and regulated. The invention is beneficial to reduce the envelope fluctuation of the modulation signal, and the demodulation method realizes the demodulation conversion of the π / 4-DQPSK modulation signal and effectively demodulates the information through the full digital processing method, and also has good carrier tracking ability , good anti-noise characteristics.

Description

technical field [0001] The present application relates to the technical field of mobile and satellite communications, and in particular, to a coherent demodulation method, device and readable storage medium suitable for π / 4-DQPSK. Background technique [0002] In the technical field of mobile communication and satellite communication, the selected signal modulation mode should be adapted to the channel characteristics of signal transmission, so as to obtain a modulated signal suitable for channel transmission. In the prior art, the maximum phase jump of the QPSK signal modulation mode is π, and the spectrum envelope fluctuates greatly, which easily leads to spectrum distortion caused by nonlinear amplification. [0003] In addition, in the process of receiving carrier synchronization, the QPSK signal modulation method has a more serious influence on the deterioration of demodulation performance as the frequency difference increases. Therefore, it is necessary to improve the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/227
CPCH04L27/2273H04L27/227
Inventor 聂晟昱李志强
Owner 南京天际易达通信技术有限公司
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