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High speed data chain amplitude-phase shift keying signal normalized receiving system and method

An amplitude phase shift keying and high-speed data technology, applied in digital transmission systems, transmission systems, multi-carrier systems, etc., can solve the problems of loss of signal performance, no signal power normalization processing, etc.

Active Publication Date: 2018-10-02
BEIJING RES INST OF TELEMETRY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] These algorithms do not normalize the signal power, and often lose signal performance when receiving demodulation

Method used

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  • High speed data chain amplitude-phase shift keying signal normalized receiving system and method

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Embodiment 1

[0124] The processing result of the normalized receiving method of the amplitude phase shift keying signal in the high-speed data link of the present invention is compared with the theoretical Modified Cramereau Limit (MCRB).

[0125] (1) Phase recovery jitter variance performance

[0126] Due to the open-loop S-curve, phase detection gain G θ Both are related to the signal-to-noise ratio, but it is difficult to update the coefficient γ in real time in engineering. Therefore, under different signal-to-noise ratios, the phase detection gain is uniformly set to G θ =2,3,4. Such as figure 2 Shown is the phase recovery jitter variance performance diagram of 64APSK of the present invention. From the phase jitter variance performance, the performance becomes worse at low SNR, and the simulation result is compared with MCRB, and the jitter variance is close to MCRB at high SNR.

[0127] (2) Phase recovery loop convergence performance

[0128] System loop bandwidth B L T=5×10 ...

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Abstract

The invention relates to a high speed data chain amplitude-phase shift keying signal normalized receiving system and method. Firstly average power estimation of a frame of data is applied to the powerof the receiving signal to perform normalization, then the normalized signal power is compared with the threshold value and the signal phase is accordingly multiplied by different factors to completephase normalization, and finally the conventional method is performed on the signal to extract the phase error to be substituted in the phase-locked loop to work. According to the method, normalizedjudgment is performed on the signal power, and the method works in the phase-locked loop and can accurately receive the amplitude-phase shift keying modulation signal so that the accuracy of phase error extraction can be more accurately enhanced in comparison with the conventional method, more information can be extracted from the signal and thus the method is particularly suitable for the 64-order amplitude-phase shift keying modulation signal.

Description

technical field [0001] The invention relates to the technical field of digital wireless communication transmission, in particular to a system and method for normalized reception of amplitude phase shift keying signals in a high-speed data link. Background technique [0002] In the high-speed measurement and control data link system, high-order amplitude-phase shift keying modulation can be used to improve the spectral efficiency of the system. For example, the UAV data link transmits multiple high-definition data or real-time transmission of remote sensing imaging data. When receiving high-order modulated signals, the requirements for carrier phase synchronization in demodulation are higher than those of traditional modulation. After carrier frequency synchronization, symbol timing synchronization, and phase coarse synchronization are completed, the phase in the data frame still has a large dynamic range due to residual frequency offset, phase noise, and other reasons. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/38
CPCH04L27/3854H04L27/3872
Inventor 闫朝星付林罡谌明
Owner BEIJING RES INST OF TELEMETRY