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Coherent demodulation device of non-geostationary orbit satellite DQPSK (Differential Quadrature Phase Shift Keying) communication

A technology of coherent demodulation and orbiting satellites, applied in modulation carrier systems, digital transmission systems, electrical components, etc., can solve the problems of long synchronization time, complex structure and processing, and complicated use, and achieve the effect of reducing pressure

Active Publication Date: 2012-01-11
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

However, this kind of device is not only complicated in structure and processing, but also needs to use a complicated mechanism, and it takes a long time to realize synchronization or cooperate with each device, which makes the realization of the receiver more complicated and takes a long time to synchronize

Method used

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  • Coherent demodulation device of non-geostationary orbit satellite DQPSK (Differential Quadrature Phase Shift Keying) communication
  • Coherent demodulation device of non-geostationary orbit satellite DQPSK (Differential Quadrature Phase Shift Keying) communication

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0016] The core idea of ​​the present invention is: after the initial signal is down-converted and low-pass filtered, and before bit synchronization and carrier synchronization, the Doppler frequency shift is eliminated through rotation solution differential processing, which reduces the Doppler frequency shift in non-stationary orbit satellite communications. The pressure of Le frequency shift on bit synchronization and carrier synchronization, in the harsh channel environment of Doppler frequency shift, directly enters bit synchronization and phase-locked loop processing without using carrier frequency shift pulling device.

[0017] figure 1 It is a structural block diagram of the coherent demodulation device 10 for non-geostationary orbit satellite DQPSK communication of the present invention. exist figure 1 Among them, the coherent demodulation device 1...

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Abstract

The invention discloses a coherent demodulation device of non-geostationary orbit satellite DQPSK (Differential Quadrature Phase Shift Keying) communication. The coherent demodulation device is used for carrying out down-conversion and lowpass filtering on initial signals output by a receiving antenna and a radio frequency system, and then Doppler frequency shift is eliminated through revolution de-differential operation. After the de-differential is completed, the signals are sent to a bit synchronization loop to complete bit synchronization, and then sent to a phase locked loop for carrier phase tracking, so that coherent demodulation is realized.

Description

technical field [0001] The invention belongs to the field of digital communication, in particular to a coherent demodulation device for non-stationary orbit satellite DQPSK (differential quadrature phase shift keying) communication. Background technique [0002] At present, digital communication has been widely used in various communication systems due to its excellent performance and convenient processing, such as satellite communication. [0003] A variety of modulation methods can be used in digital communication, among which MPSK (multiphase keying) has been widely valued for its good spectrum utilization and anti-noise performance. Multiphase keying is a modulation method that uses multiple different phases of the carrier to represent digital information. Multiphase keying can be divided into absolute phase shift keying and differential phase shift keying. Absolute phase shift keying uses the phase information of the current symbol to represent digital information, whi...

Claims

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Application Information

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IPC IPC(8): H04L27/00H04L27/227H04L27/38
Inventor 姜泉江陈晓挺刘会杰丁晟朱孝武池方玉梁广
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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