CN109842427A - A kind of data transmission system and method - Google Patents
A kind of data transmission system and method Download PDFInfo
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- CN109842427A CN109842427A CN201811555060.4A CN201811555060A CN109842427A CN 109842427 A CN109842427 A CN 109842427A CN 201811555060 A CN201811555060 A CN 201811555060A CN 109842427 A CN109842427 A CN 109842427A
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Abstract
A kind of data transmission system and method provided by the invention, including signal processing module, radiofrequency emitting module and Receiver Module, wherein, Receiver Module is filtered, is amplified to receiving data-signal, later will treated data signal transmission to signal processing module carry out Data Stream Processing and will treated data information transfer arrives radiofrequency emitting module, radiofrequency emitting module completes to be filtered the microwave signal that signal processing module is sent, amplifies and exports later；The system can not only make signal energy sharp fall, to make signal hiding in noise, while a possibility that capable of flexibly using different channel codings, being entrapped is lower.
Description
Technical field
The present invention relates to data communication fields, and in particular to a kind of data transmission system and method.
Background technique
Currently, data transmission system is communicated using radio, in the general data transmission system in market, routinely make
With the public frequency band of 2.4G frequency range, in external environment in use, existing such as WiFi, wireless mouse, wireless microphone each
The signal of kind 2.4Ghz, causes equipment to be easy to interfere, and mistake occurs in data transmission, and system reliability and stability decline to a great extent；
Equipment is easy to be trapped using fixed Channel Processing chip, information simultaneously, and security performance is poor, and exists in control and lured
The risk caught, device security have larger hidden danger.
Therefore in information transmission, severe requirement is proposed for the reliability of instruction, safety and stability, is become
The primary problem of current composite base band data catenary system.
Summary of the invention
The purpose of the present invention is to provide a kind of data transmission system and method, solve existing data link system into
When row information is transmitted, there are risks for reliability, safety and stability.
In order to achieve the above object, the technical solution adopted by the present invention is that:
A kind of data transmission system provided by the invention, including signal processing module, radiofrequency emitting module and radio frequency reception
Module, wherein Receiver Module is filtered, is amplified to receiving data-signal, later will treated that data-signal passes
It is defeated to signal processing module carry out Data Stream Processing and will treated data information transfer to radiofrequency emitting module, radio-frequency transmissions
Module completion the microwave signal that signal processing module is sent is filtered, amplify later export.
Preferably, antenna is integrated on radiofrequency emitting module and Receiver Module.
Preferably, a J30-15TJ connector and two SMA-KFB2 connectors are provided on signal processing module,
In the SMA-KFB2 connector that is arranged on a SMA-KFB2 connector and radiofrequency emitting module connect；Another MA-KFB2 connects
The SMA-KFB2 connector being arranged on plug-in unit and Receiver Module connects；J30-15TJ connector point on signal processing module
Do not connect with the J30-9ZKP connector being arranged on the J30-15ZKP connector and Receiver Module that are arranged on radiofrequency emitting module
It connects.
Preferably, signal processing module includes fpga chip, AD9361 chip, clock circuit, power module, interface core
Piece, RS422 serial ports and LVDS chip, wherein clock circuit, interface chip, RS422 serial ports, LVDS chip and AD9361
Control pin and data pins are connect with fpga chip；The radio-frequency transmissions of AD9361, radio frequency reception pin are sent out with radio frequency respectively
Penetrate module, Receiver Module electrical connection；Meanwhile power module provides power supply to fpga chip；RS422 serial ports, LVDS chip
Connect host computer.
Preferably, Receiver Module includes preselection filter and power amplifier, and preselection filter receives signal to antenna and carries out
Filtering inhibits bandwidth range external signal；Power amplifier amplifies the signal after filtering.
Preferably, radiofrequency emitting module includes preselection filter and power amplifier, and preselection filter receives signal to antenna and carries out
Filtering inhibits bandwidth range external signal；Power amplifier amplifies the signal after filtering.
A kind of data transmission method, based on a kind of data transmission system, comprising the following steps:
Receiver Module is filtered, is amplified to receiving data-signal, later will treated data signal transmission
It is handled again to signal processing module, signal processing module carries out Data Stream Processing to the data received, and will processing
The microwave letter that data information transfer that treated sends signal processing module to radiofrequency emitting module, radiofrequency emitting module completion
It number is filtered, amplifies, exporting later.
Preferably, the specific method that signal processing module handles the data received is:
The first step carries out 1/3 convolution channel coding to the data flow of input；
Second step adds synchronous head to the data flow after 1/3 convolution channel coding of progress；
Third step carries out differential encoding to the data flow after addition synchronous head；
4th step adds pilot header to the data flow after progress differential encoding；
5th step distinguishes the pilot header data flow in the 4th step, the synchronous head data flow in second step and source traffic
Carry out 511 direct expansion coding；
6th step carries out BPSK modulation to the pilot header data flow after progress direct expansion coding in the 5th step；To in the 5th step
Synchronous head data flow and source traffic after carrying out direct expansion coding carry out QPSK modulation respectively；
The data flow received is carried out conjugate multiplication using local pseudorandom in frequency domain, carries out IFFT later by the 7th step
Operation, the data flow after being captured；
8th step carries out data tracking to the data flow after capture, wherein firstly, carrying out frequency first using 1 rank frequency locking ring
Tracking partially, at the same time, is biased line trace to numeric data code using 2 exponent rings；Secondly, carrying out phase to data using 2 rank phaselocked loops
Inclined tracking is biased line trace to numeric data code using 2 exponent rings at the same time；
9th step carries out differential decoding and frame synchronization process to the data flow traced into, extracts the valid data of transmission；
Tenth step carries out Viterbi decoding to the valid data extracted and framing is handled, the significant figure exported
According to.
Compared with prior art, the beneficial effects of the present invention are:
A kind of data transmission system provided by the invention later will by being filtered, amplifying to receiving data-signal
Treated, and data signal transmission is handled again to signal processing module, and signal processing module carries out the data received
Data Stream Processing, and will processing treated data information transfer to radiofrequency emitting module, the complete pair signals of radiofrequency emitting module
The microwave signal that processing module is sent is filtered, amplifies, and exports later；The system can not only make signal energy significantly under
Drop, to make signal hiding in noise, while a possibility that can flexibly use different channel codings, be entrapped compared with
It is low.
Further, FPGA+AD9361 framework is used in hardware design, the frequency range of AD9361 is customizable, can evade
General frequency range, anti-interference ability is greatly improved on transmission；FPGA can carry out Software Coding to transmission signal,
By the spread spectrum of pseudo noise code, signal energy sharp fall can not only be made, to make signal hiding in noise, while energy
A possibility that enough flexibly using different channel codings, being entrapped is lower.
Further, upper and lower two antennas are used in receiving module design, in the case where evil plunders weather environment when equipment is cut tiltedly
Or it is able to use another antenna when reverse and is communicated.
Detailed description of the invention
Fig. 1 is Transmission system structural schematic diagram；
Fig. 2 is data transmission method flow chart.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in more detail.
As shown in Figure 1, a kind of data transmission system provided by the invention, including signal processing module, radiofrequency emitting module
And Receiver Module, antenna is integrated on radiofrequency emitting module and Receiver Module；Wherein, collect on Receiver Module
Upper antenna and the lower antenna of reception are received at having.
Receiver Module is filtered, is amplified to receiving data-signal, later will treated data signal transmission
It is handled again to signal processing module, signal processing module encodes the data received, spreads, de-spreading, modulating,
Demodulation, capture, tracking, AD/DA conversion and power control, gain control, later will processing treated that data information transfer arrives
Radiofrequency emitting module, radiofrequency emitting module completion are filtered the microwave signal that signal processing module is sent, amplify, being output to
Diffusion is radiated on antenna.
Signal processing module carries out input/output signal transmitting-receiving using a piece of AD9361 chip, the FPGA of a piece of K7 series into
Row signal processing operation.
A J30-15TJ connector and two SMA-KFB2 connectors are provided on signal processing module, one of them
The SMA-KFB2 connector being arranged on SMA-KFB2 connector and radiofrequency emitting module connects；Another MA-KFB2 connector and
The SMA-KFB2 connector connection being arranged on Receiver Module；J30-15TJ connector on signal processing module respectively with penetrate
The J30-9ZKP connector being arranged on the J30-15ZKP connector and Receiver Module being arranged on frequency transmitting module connects.
Specifically:
Signal processing module includes the fpga chip of model XC7K325T, AD9361 chip, clock circuit, power supply mould
Block, interface chip, RS422 serial ports and LVDS chip, wherein
Control pin and data pins, clock circuit pin, RS422 the and LVDS chip pin of AD9361 is electric with FPGA
Connection；The radio-frequency transmissions and radio frequency reception pin of AD9361 are electrically connected with radiofrequency emitting module and Receiver Module respectively.
Receiver Module includes preselection filter and power amplifier, and preselection filter receives signal to antenna and is filtered, presses down
Bandwidth range external signal processed；Power amplifier amplifies the signal after filtering, improves signal power.
Radiofrequency emitting module includes narrow band filter and power amplifier, and narrow band filter carries out signal processing module input signal
Filtering inhibits bandwidth external signal；Power amplifier amplifies the signal after filtering, improves transmission power.
The data-link simplifies capture in data phase selection QPSK modulation for acquisition and tracking stage selection BPSK modulation
The algorithm of tracking carries out RS channel coding, 511 direct expansion coding, the synchronous head and QPSK that BPSK is modulated simultaneously for data
The data flow of modulation is sent to Microwave emission module, and is radiated by transmitting antenna.
FPGA+AD9361 framework is used in hardware design.The frequency range of AD9361 is customizable, can evade general frequency range,
Anti-interference ability is greatly improved on transmission；FPGA can to transmission signal carry out Software Coding, by puppet with
The spread spectrum of machine code can not only make signal energy sharp fall, to make signal hiding in noise, while can be flexible
Using different channel codings, a possibility that being entrapped, is lower；Upper and lower two days are used in microwave receiving module design simultaneously
Line is able to use another antenna when equipment cuts oblique or reverse in the case where evil plunders weather environment and is communicated.
As shown in Fig. 2, the detailed process that signal processing unit handles data:
First, 1/3 convolution channel coding is carried out to input traffic, specifically: convolutional encoding formula is 1001111, is made
It is handled with the convolutional encoding IP kernel that Vivado is carried, can be improved receiver sensitivity using convolutional encoding, resist channel
The random noise of middle appearance；
Second, synchronous head is added to the data after 1/3 convolution channel coding of progress, synchronous head is used as frame head in demodulating process
Identify and judge；
Third carries out differential encoding to the data flow after addition synchronous head, can resist signal by differential encoding and adjust
The phase turning problem occurred in transmission process processed；
4th, pilot header is added to the data flow of differential encoding；Pilot header is one group of repetitive sequence, and pilot header length is
168, sending data is 1；
5th, the direct expansion for carrying out 511 respectively to pilot header data flow, synchronous head data flow and source traffic encodes, direct expansion
Coding uses pseudo-random sequence, and pseudo-random sequence is one group of random 0,1, and the probability for occurring continuous 0,1 is 1/2n+1, wherein
N is 0,1 length continuously occurred；
6th, BPSK modulation is carried out to the pilot header after progress direct expansion coding；To the synchronous head number after progress direct expansion coding
QPSK modulation is carried out respectively according to stream and source traffic；
7th, data capture is carried out in receiving end, specifically: firstly, using local pseudorandom and receiving data in frequency domain
Carry out conjugate multiplication；Secondly, carrying out IFFT operation to the data flow after progress conjugate multiplication, it is transformed into time domain and carries out sentencing for peak value
It is disconnected, so as to know data whether acquisition success, complete the thick calibration of spreading code；
8th, carry out data tracking, specifically, firstly, using 1 rank frequency locking ring to the data flow that captures carry out frequency deviation with
Track, the Doppler shift occurred during exercise to make up equipment, meanwhile, line trace, school are biased to numeric data code using 2 exponent rings
Quasi- output data；Secondly, using 2 rank phaselocked loops the data exported after data calibration are carried out with the tracking of skew, set to make up
The standby phase delay present in transmission process, meanwhile, line trace is biased to numeric data code using 2 exponent rings, calibrates output data；
9th, differential decoding and frame synchronization process are carried out to the data exported after calibration, to extract the effective of transmission
Data；
Tenth, Viterbi decoding is carried out to secured transmission of payload data in the 9th step and framing is handled, to complete channel solution
Code is corrected the random error occurred in data transmission procedure, while being exported to valid data.
The present invention in 25 kilometer ranges, can realize the stabilization of equipment room, safe and reliable communication.
Claims (8)
1. a kind of data transmission system, which is characterized in that including signal processing module, radiofrequency emitting module and radio frequency receiving
Block, wherein Receiver Module is filtered, is amplified to receiving data-signal, later will treated data signal transmission
To signal processing module carry out Data Stream Processing and will treated data information transfer to radiofrequency emitting module, radio-frequency transmissions mould
Block completion the microwave signal that signal processing module is sent is filtered, amplify later export.
2. a kind of data transmission system according to claim 1, which is characterized in that radiofrequency emitting module and radio frequency receiving
Antenna is integrated on block.
3. a kind of data transmission system according to claim 1, which is characterized in that be provided with one on signal processing module
J30-15TJ connector and two SMA-KFB2 connectors are arranged on one of SMA-KFB2 connector and radiofrequency emitting module
SMA-KFB2 connector connection；The SMA-KFB2 connector being arranged on another MA-KFB2 connector and Receiver Module
Connection；J30-15TJ connector on signal processing module respectively with the J30-15ZKP connector that is arranged on radiofrequency emitting module
It is connected with the J30-9ZKP connector being arranged on Receiver Module.
4. a kind of data transmission system according to claim 1, which is characterized in that signal processing module includes FPGA core
Piece, AD9361 chip, clock circuit, power module, interface chip, RS422 serial ports and LVDS chip, wherein clock circuit connects
Mouthful chip, RS422 serial ports, LVDS chip and AD9361 control pin and data pins connect with fpga chip；
The radio-frequency transmissions of AD9361, radio frequency reception pin are electrically connected with radiofrequency emitting module, Receiver Module respectively；Meanwhile power supply
Module provides power supply to fpga chip；RS422 serial ports, LVDS chip connect host computer.
5. a kind of data transmission system according to claim 1, which is characterized in that Receiver Module includes pre-selection filtering
Device and power amplifier, preselection filter receive signal to antenna and are filtered, and inhibit bandwidth range external signal；After power amplifier is to filtering
Signal amplifies.
6. a kind of data transmission system according to claim 1, which is characterized in that radiofrequency emitting module includes pre-selection filtering
Device and power amplifier, preselection filter receive signal to antenna and are filtered, and inhibit bandwidth range external signal；After power amplifier is to filtering
Signal amplifies.
7. a kind of data transmission method, which is characterized in that based on a kind of data transmission system described in claim 1, including with
Lower step:
Receiver Module is filtered, is amplified to receiving data-signal, later will treated data signal transmission to believing
Number processing module is handled again, and signal processing module carries out Data Stream Processing to the data received, and processing is handled
Data information transfer afterwards to radiofrequency emitting module, radiofrequency emitting module complete the microwave signal that signal processing module is sent into
Row filtering, amplification, export later.
8. a kind of data transmission method according to claim 7, which is characterized in that signal processing module is to the number received
It is according to the specific method handled:
The first step carries out 1/3 convolution channel coding to the data flow of input；
Second step adds synchronous head to the data flow after 1/3 convolution channel coding of progress；
Third step carries out differential encoding to the data flow after addition synchronous head；
4th step adds pilot header to the data flow after progress differential encoding；
5th step carries out the pilot header data flow in the 4th step, the synchronous head data flow in second step and source traffic respectively
511 direct expansion coding；
6th step carries out BPSK modulation to the pilot header data flow after progress direct expansion coding in the 5th step；To being carried out in the 5th step
Synchronous head data flow and source traffic after direct expansion coding carry out QPSK modulation respectively；
The data flow received is carried out conjugate multiplication using local pseudorandom in frequency domain, carries out IFFT operation later by the 7th step,
Data flow after being captured；
8th step, to after capture data flow carry out data tracking, wherein firstly, carried out first using 1 rank frequency locking ring frequency deviation with
Track is biased line trace to numeric data code using 2 exponent rings at the same time；Secondly, carrying out skew to data using 2 rank phaselocked loops
Tracking, at the same time, is biased line trace to numeric data code using 2 exponent rings；
9th step carries out differential decoding and frame synchronization process to the data flow traced into, extracts the valid data of transmission；
Tenth step carries out Viterbi decoding to the valid data extracted and framing is handled, the valid data exported.
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| CN201811555060.4A CN109842427A (en) | 2018-12-18 | 2018-12-18 | A kind of data transmission system and method |
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| CN201811555060.4A CN109842427A (en) | 2018-12-18 | 2018-12-18 | A kind of data transmission system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110336711A (en) * | 2019-06-13 | 2019-10-15 | 苏州中科集成电路设计中心有限公司 | A kind of the check and evaluation method and its realization device of carrier communication signal quality |
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| US20170373790A1 (en) * | 2016-06-22 | 2017-12-28 | Arrow Electronics, Inc. | Adaptive modulation and protocol system |
| CN106357295A (en) * | 2016-10-17 | 2017-01-25 | 天津光电通信技术有限公司 | Ship automatic identification system with RF agile transceiver AD9361 and implementation method thereof |
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Application publication date: 20190604 |