Dynamic plasma sheath phase shift keying signal decision detection method

A technology of plasma sheath and phase shift keying, which is applied in the field of ion sheath phase shift keying signal judgment and detection, can solve the problems of reducing the bit error rate, reducing the overlapping of constellation points, and complicated implementation methods, so as to reduce the impact, Solve the effect of constellation point overlap and reliable signal transmission

Inactive Publication Date: 2016-05-04
XIDIAN UNIV
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Problems solved by technology

However, since the plasma sheath is dynamically time-varying, the dynamic characteristics of the plasma sheath can cause parasitic modulation effects
[0005] Measure 2 reduces the concentration of the plasma sheath through an intervention mechanism, but the implementation method is very complicated and will also be affected by the parasitic modulation effect
[0006] Increasing the carrier frequency and reducing the concentration of the plasma sheath through the intervention mechanism can help to weaken the modulation effect, reduce the overlap of constellation points, and reduce the bit error rate, but cannot completely eliminate the parasitic modulation effect
That is to say, it is impossible to completely offset the influence of the dynamic plasma sheath and realize the effective transmission of information

Method used

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  • Dynamic plasma sheath phase shift keying signal decision detection method
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  • Dynamic plasma sheath phase shift keying signal decision detection method

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[0020] In order to make the objects and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with examples. It should be understood that the following words are only used to describe one or several specific implementation modes of the present invention, and do not strictly limit the protection scope of the specific claims of the present invention.

[0021] The embodiment of the present invention will be described in detail below by taking a binary phase shift keying signal (BPSK signal) as an example and in conjunction with the accompanying drawings.

[0022] Such as figure 1 As shown, the phase-shift keying signal judgment detection method under the dynamic plasma sheath of the present invention is divided into three steps:

[0023] Step 1: Construct training examples

[0024] The radial average electron density of the plasma sheath in this example is 1×10 12 cm -3 , the corresponding plasma frequency is 8....

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Abstract

The invention relates to a dynamic plasma sheath phase shift keying signal decision detection method. A special law of an electromagnetic wave propagating in the plasma is used, a channel feature is predicted through measurement on a reflected wave, and a training sample is built. A signal acquisition device acquires an m-dimensional phase shift keying signal after plasma sheath, the m-dimensional phase shift keying signal is transmitted to a processing unit for decision detection processing, and a decision detection processing result is outputted. According to the dynamic plasma sheath phase shift keying signal decision detection method provided by the above technical scheme, the constellation point overlapping problem caused by dynamic plasma sheath spurious modulation effects can be effectively solved.

Description

technical field [0001] The invention relates to the field of near-space measurement and control communication, in particular to a dynamic plasma sheath phase-shift keying signal judgment and detection method. Background technique [0002] During the flight of a re-entry vehicle or a high-speed vehicle in near space, the body and the air will have severe friction, which will generate a plasma sheath, resulting in deterioration of communication quality, and in severe cases, interruption of information links, forming the so-called "black barrier" phenomenon. [0003] In recent years, it is generally believed that the main measures that are promising to solve this problem are: 1. Improving communication frequency and power, 2. Pneumatic forming, 3. Quenching of electrophilic substances, 4. Weakening of electromagnetic windows. To sum up, for the blackout problem caused by the plasma sheath, the current mainstream solution is to increase the communication frequency or reduce the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/18
CPCH04L25/03312H04L27/18
Inventor 杨敏李小平何攀刘彦明石磊谢楷王迪
Owner XIDIAN UNIV
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