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Wave form generation method and wave form generator used for accurate measurement of short wave channel

A waveform generator and precise measurement technology, applied in multi-carrier systems, transmission monitoring, electrical components, etc., can solve problems such as inability to acquire accurately and channel measurement equipment that cannot meet needs

Active Publication Date: 2015-02-11
THE 22ND RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the channel measurement is usually carried out by using oblique sounders and chirp sounders. These two types of equipment were originally designed for ionospheric detection, and can obtain parameters such as channel signal energy and absolute path delay. performance channel fading characteristic parameters, but cannot be accurately obtained
Especially for the current short-wave communication that commonly uses digital signal transmission, obtaining channel parameters such as Doppler broadening and Doppler frequency shift that characterize channel fading characteristics is a necessary condition for improving short-wave communication equipment. The existing channel measurement equipment can not meet the needs

Method used

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  • Wave form generation method and wave form generator used for accurate measurement of short wave channel
  • Wave form generation method and wave form generator used for accurate measurement of short wave channel
  • Wave form generation method and wave form generator used for accurate measurement of short wave channel

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Embodiment 1

[0050] Such as figure 1 As shown, the embodiment of the present invention provides a waveform generation method for accurate measurement of short-wave channels, which is applied to a system including a short-wave transmitter and a short-wave receiver, specifically including:

[0051] Step S101, generating a Bark code, and sequentially performing spread spectrum processing, symbol mapping, scrambling processing and PSK modulation on the Bark code to generate a preamble data modulation waveform for assisting the short-wave receiver in signal acquisition and synchronization, and the obtained The above-mentioned preamble data modulation waveform is sent to the short-wave receiver through the short-wave transmitter;

[0052] In this step, the spread spectrum processing is specifically as follows: for the 1 data in the Bark code, use the preamble sequence random code generator to generate a leading pseudo-random sequence corresponding to the 1 data, and realize the spread spectrum o...

Embodiment 2

[0060] An embodiment of the present invention provides a waveform generation method for accurate measurement of shortwave channels. The basic principle of this embodiment is the same as that of Embodiment 1, and it is a further detailed elaboration of the method described in Embodiment 1 with reference to the accompanying drawings.

[0061] In the embodiment of the present invention, according to the sequence of measurement waveform transmission, the waveform generation process is divided into three stages, namely: stage A: TLC / AGC stage; stage B: leading data modulation waveform stage; stage C: measurement data modulation wave phase. in:

[0062] Regarding Phase A:

[0063] Stage A is the TLC / AGC stage, which completes the generation of single-point frequency signals and sends the generated single-point frequency signals to shortwave receivers. Its functions are:

[0064] (1) If the shortwave receiver uses automatic gain control, then the single-point frequency is used to c...

Embodiment 3

[0102] Such as Figure 9 As shown, the embodiment of the present invention provides a waveform generator for accurate measurement of shortwave channels, which is applied in a system including a shortwave transmitter and a shortwave receiver, and specifically includes: a preamble data modulation link and a measurement data modulation link, Wherein, the processing timing of the preamble data modulation link is earlier than that of the measurement data modulation link;

[0103] The leading data modulation link includes: a Bark code generator, a spreader, a symbol mapper, a scrambler and a PSK modulator; the Bark code generated by the Bark code generator passes through the spreader, the symbol mapper, After being processed by the scrambler and the PSK modulator, generate a preamble data modulation waveform for assisting the shortwave receiver in signal capture and synchronization, and send the preamble data modulation waveform to the shortwave receiver via the shortwave transmitte...

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Abstract

The invention discloses a wave form generation method and wave form generator used for accurate measurement of a short wave channel. The wave form generation method comprises the step 1, generating Bark codes, sequentially carrying out spread spectrum treatment, symbol mapping, scrambling treatment and phase shift keying (PSK) modulation on the Bark codes to generate lead data modulation wave form used for helping a short wave receiving machine to capture and synchronize signals and sending the lead data modulation wave form to the short wave receiving machine through a short wave emitting machine; and the step 2, inputting full-1 data, sequentially carrying out spread spectrum treatment, symbol mapping, scrambling treatment and PSK modulation on the full-1 data to generate measurement data modulation wave form used for helping the short wave receiving machine to capture channel parameters and sending the measurement data modulation wave form to the short wave receiving machine through the short wave emitting machine. By emitting and receiving the wave form signals generated by the wave form generation method and the wave form generator, the short wave receiving machine can be helped to calculate channel parameters relative to short wave communication to finish short wave channel measurement work.

Description

technical field [0001] The invention relates to the fields of shortwave communication and shortwave channel modeling, in particular to a waveform generation method and a waveform generator for accurate measurement of shortwave channels. Background technique [0002] Short-wave communication is a communication method that relies on ionospheric reflection for long-distance data transmission, and plays a very important role in military communication. However, due to the layered structure of the ionosphere, multi-mode propagation and multi-hop propagation, irregular movement, and the absorption and reflection loss of the ionosphere, etc. determine the propagation characteristics of the short-wave channel, making the multi-path delay, fading, Doppler frequency shift and Doppler broadening are different from cellular channels in terms of generation mechanism and expression. Channel measurement is an effective way to study the propagation characteristics of short-wave channels. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/309H04B17/391H04B1/7075H04L27/32
Inventor 金珠吴永宏刘毅敏朱振飞
Owner THE 22ND RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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