CN106789102A - A kind of LAN terminal based on uhf band - Google Patents
A kind of LAN terminal based on uhf band Download PDFInfo
- Publication number
- CN106789102A CN106789102A CN201611173989.1A CN201611173989A CN106789102A CN 106789102 A CN106789102 A CN 106789102A CN 201611173989 A CN201611173989 A CN 201611173989A CN 106789102 A CN106789102 A CN 106789102A
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- China
- Prior art keywords
- signal
- converted
- fpga
- uhf band
- digital baseband
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
Abstract
The invention provides a kind of LAN terminal based on uhf band, reception signal is after limiter, bandpass filter and LNA, give electrically tunable filter, the output signal of electrically tunable filter is converted to ABB i/q signal through quadrature demodulator, after being sampled through ADC, digital baseband i/q signal output to FPGA, FPGA are obtained into file to digital baseband I/Q signal reduction；File to be sent is torn open and is converted to digital baseband i/q signal by FPGA, ABB i/q signal is converted to by DAC, the analog signal of frequency in uhf band is converted to through quadrature modulator, then is exported through transmitting path, transmitting path includes wave filter, power amplifier, frequency synthesizer.The present invention being capable of flexible networking, real-time Communication for Power, Random route, the not only customer service fading effect of traditional OFDM networks, and realize the coherent demodulation mode of many subcarriers, with more preferable robustness.
Description
Technical field
The invention belongs to communication equipment research and development field, the design and implementation of a kind of communication terminal equipment are relate to.
Background technology
In mobile communication system, increase bandwidth, raising system spectrum utilization rate and Bian strong error correction codings one
It is directly the primary solutions for improving system transfer rate and reliability.OFDM(Orthogonal Frequency Division
Multiplexing) technology is because it has the availability of frequency spectrum high, strong anti-multipath jamming ability and can flexibly distribute frequency spectrum
The advantages of bandwidth, it is set increasingly to be paid attention in the field of wireless communication.
QPSK (Quadrature Phase Shift Keying) as a kind of modulation demodulation system in digital communication,
By its strong interference immunity, the availability of frequency spectrum it is high, be adapted to high-speed transfer the advantages of, as the most frequently used modulation demodulation system it
One.It has the advantages that a series of uniquenesses, and such as strong anti-interference performance, error performance be good, opposite, narrow power spectrum, the availability of frequency spectrum
It is high, there is no linear requirements etc. to multiplying arrangement, it has also become a kind of highly important modulation demodulation system in modern digital communication.
Ad Hoc network purposes are under rugged environment, to disobey the communication network that infrastructure is capable of rapid deployment.Ad
Hoc network has systems self-organize and sets up flexible characteristic, and the survivability of network is stronger than common survivability.External
Nokia companies work out can utilize the wireless mobile router equipment of self-organizing network, and its product has been listed, and
Additionally provide the solution of wireless access system.In addition, the mobile wireless based on PHS systems that NEC Corporation works out is calculated
Network system has good applicability.American R ＆ D company Mesh Networks have also been worked out and have been applied to Ad Hoc networks
The solution of the wireless communication system of product and the various mobile terminals and the network equipment in Ad Hoc networks field are applied to,
Had laid a good foundation to provide next generation mobile communication system terminal.
But by these technologies are grasped by offshore company for a long time, these technologies not yet realize integrated and work at home
How the terminal product of journey, become one these advanced communications, develops one kind based on QPSK and OFDM technology, and
With reference to the communication terminal equipment of the Ad Hoc network agreements of full self-organizing, and the terminal can also by proceduring research and development and checking,
As the target that domestic many companies are competitively studied.
The content of the invention
In order to overcome the deficiencies in the prior art, the present invention provide one kind can flexible networking, real-time Communication for Power, Random route
Communication system, the not only customer service fading effect of traditional OFDM networks, and realize the coherent demodulation side of many subcarriers
Formula, with more preferable robustness.
The technical solution adopted for the present invention to solve the technical problems is：Receive signal through limiter, bandpass filter and
After LNA, electrically tunable filter is given, the output signal of electrically tunable filter is through quadrature demodulator and the 350MHz of frequency synthesizer
Signal carries out down coversion mixing, is converted to ABB i/q signal, after being sampled through ADC, the output of digital baseband i/q signal is arrived
FPGA, FPGA carry out FFT, QPSK demodulation, 3 × 3 deinterleavings and Turbo2/3 yards of decoding to digital baseband I/Q signal, also
Originally it was subpacket data that each length is 2kb, subpacket data number was carried out into packaging treatment in sequence, then carry out packet spelling
Bag, reduction obtains file；File declustering to be sent is packet by FPGA, then is split as the attached bag number that each length is 2kb
According to being encoded to each subpacket data row Turbo code 2/3,3 × 3 matrix intersectors, QPSK modulation and IFFT conversion, the digital base of generation
Band i/q signal, ABB i/q signal is converted to by DAC, is carried out with the 350MHz signals of frequency synthesizer through quadrature modulator
Up-conversion is mixed, and is converted to the analog signal of frequency in uhf band, then is exported through transmitting path, transmitting path include wave filter,
Power amplifier, frequency synthesizer.
The beneficial effects of the invention are as follows：The technologies such as advanced OFDM, QPSK and Ad Hoc are employed, one is realized very
Flexibly and efficiently it is based on the communication system of uhf band.The communication system just can apply to a piece of spy by simple configuration
(about 10km in fixed communication zone2), realize in real time, automatically, at a high speed and flexibly radio communication.Because the terminal is to application
Layer develops the network interface based on TCP/IP, in that context it may be convenient to PC computers of plugging into, and realizes the wireless penetration of wired Ethernet
The up to communication of 5Mbps, flexible and efficient wireless network has been built with relatively low cost.
Brief description of the drawings
Fig. 1 is typical ofdm system schematic diagram；
Fig. 2 is based on uhf band wireless communication system composition schematic diagram；
Fig. 3 is based on uhf band terminal composition schematic diagram；
Fig. 4 is based on uhf band terminal communication flow diagram.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples, and the present invention includes but are not limited to following implementations
Example.
Present invention employs current advanced QPSK and OFDM technology, the Ad Hoc network agreements of full self-organizing are combined,
Efficient and flexible wireless broadband communication can be realized in smaller range.
The major function that the present invention is realized is as follows：
1. a kind of high speed data transfers method based on OFDM OFDMs is realized；
2. a kind of digital modulation based on QPSK QPSKs and demodulation mode are realized；
3. flexible Ad Hoc ad hoc networkings between multiple terminals are realized；
4, realize the real-time dynamic management and monitoring of network Qos between multiple terminals；
5. realize being up in LAN the information communication rate of 5Mbps；
The present invention includes one piece of network process module and one piece of radio frequency processing module.Network process module is mainly responsible for link
Layer more than, including Internet and application layer processing data packets, using Ad Hoc ad hoc networks, each node can be received
Enter in network, realize non-stop layer node, self-organizing, the self-organizing network of flexibly switching.Radio frequency processing module is realized to penetrating
The transmitting-receiving process function of frequency signal, mainly includes using the functions such as coding, intertexture, modulation during transmitting；High-speed a/d is used during reception
Radiofrequency signal to uhf band is sampled, and is demodulated, is deinterleaved, decoding, the technology such as digital correlation, realizes a kind of miniaturization
Communication terminal equipment transmit-receive technology.
The present invention in local radio communication provide the terminal skill of real-time, two-forty, a flexible networking and miniaturization
Art.The terminal technology is formed based on the advanced communication technology research and development such as OFDM, QPSK and Ad Hoc, and emphasis has customized height and hastened
The function such as rate transmitting and reception, self-organizing network, miniaturization and low power dissipation design, has reached without going through gateway or relay station reality
Broadband wireless communications function in existing LAN.
As seen from Figure 1, in the structured flowchart of typical OFDM system transceiver, the information that will be transmitted in transmitting terminal is led to
Cross QPSK baseband modulation modes to be mapped in subcarrier amplitude and phase, then carry out discrete fourier inverse transformation by data
Etc. a series of conversion, data are converted to time domain space.Because IFFT has faster execution efficiency, generally for raising
The efficiency of calculating, reduces time of calculating etc., is often required to replace IDFT by IFFT is commonly used in actual system.In receiving terminal,
Using the operation opposite with transmitting terminal, the radiofrequency signal that will be received carries out a series for the treatment of and is demodulated to data signal.By
In IFFT and FFT inverse transformation each other, so FFT operations are similar to IFFT, therefore transmitter and receiver can be using same hard
Part equipment.
As seen from Figure 2, it is typically main by terminal, antenna, wireless channel group based on uhf band wireless communication system
Into.Its main network mode of operation has：
The whole network pattern：I.e. all of terminal constitutes a WLAN, in net by wireless channel and the function of route
All of member can realize interconnection and intercommunication, it is possible to achieve point-to-point and broadcast massage pattern.
Subnet pattern：I.e. according to the definition of Ad Hoc self-organizing networks, form multiple communication subnets or cluster, each subnet or
Can need to be forwarded by cluster head or route implementing with free communication, the communication between subnet or cluster in cluster.In each subnet or cluster
Elected every 12 seconds by improved LEACH algorithms.
Both the above network mode of operation can carry out human configuration and conversion, when terminal number is less than 16 in net, network
Conversion time is less than 5 seconds.
As seen from Figure 3, the Receiver And Transmitter of terminal is using miniaturization, low power dissipation design scheme.Receive letter
After number through limiter, bandpass filter and LNA, electrically tunable filter is given, electrically tunable filter bandwidth is not less than 10MHz, and electricity is adjusted
The output signal of wave filter, ABB i/q signal is converted to through quadrature demodulator, is sampled through ADC, by digital baseband I/Q letters
To FPGA, receiving algorithm is completed by FPGA for number output.The digital baseband i/q signal that terminal sends is generated in FPGA, is turned by DAC
ABB i/q signal is changed to, the analog signal of frequency in uhf band is converted to through quadrature modulator, then it is defeated through transmitting path
Go out, transmitting path output includes wave filter, power amplifier, frequency synthesizer.FPGA Embedded double-core arm processors can with abundant
Programmed logic resource, for realizing Base-Band Processing and external interface, external interface can be using gigabit network interface or RS232, RS422 etc.
Interface.
As seen from Figure 4, specific works step of the invention is as follows：
1. device power and initialization；
Terminal of the invention had both included hardware circuit or including software function, so at the beginning of carrying out hardware first after electricity on terminal
Beginning chemical industry is made, and these hardware are mainly including processor, FPGA, frequency synthesizer, A/D and electronic component or circuit etc. D/A.
While hardware initialization, the software stored in Flash is also loaded into carrying out software initialization operation in RAM, software just
Beginningization content mainly include RAM reset, twoport reset, global variable initialization assignment, external interface such as network interface, RS232 or
The initialization of the interfaces such as RS422.
2. self-detection result is reported；
After terminal is respectively completed the initial work of hardware and software after the power-up, it will generation self-detection result list, its
The self-detection result of all of hardware, software and interface before including, CPU sends out by after collection, being packaged into self-detection result message
Give application software.
3. workflow is entered；
Terminal is after initialization and self-detection result are reported, if result initially enters normal work without abnormal
In flow.Workflow mainly includes transmitting flow and receives flow.Because terminal uses Ad Hoc MANET agreements, institute
With the transmitting of terminal and receive control be by link layer software according to communication requirement come carry out alternately control.Enter per you machine
After normal workflow, will all replace in the time domain rotation carry out transmitting flow or receive flow, be sustained until
It is powered-down.
The main flow of transmitting is as follows：
A) when application layer generates the communication requirement of some length datas, application layer software first will be assisted according to communication interface
The some packet communication data for the packing of some length datas being resolved into and possessing certain packet length are discussed, such as application layer is needed one
The file of 3.5Mb is sent by terminal, first has to tear this document open according to interface protocol (being 20kb per communication bag regular length)
It is divided into 175 packets, and streamlined numbering is carried out respectively to it, order is sent to FPGA interface one by one.
B) packet of each 20kb carried out again inside FPGA being split as 10 attached bags of 2kb, to each subpacket data
2/3 coding is carried out according to Turbo code, inromation bandwidth is 9MHz, and increase synchronous head synchronization tail generation 12MHz data flows, then
3 × 3 matrix intersectors are carried out, and carries out QPSK modulation, then carry out 4IFFT conversion, subcarrier of the generation with a width of 4 1.5M
Ofdm signal.
C) up-conversion mixing is carried out to intermediate-freuqncy signal and frequency source 350MHz, realizes the carrier bandwidths of 420MHz penetrating for 6M
Frequency signal, the level of RF signals is 0dBm.
D) radiofrequency signal is amplified treatment, by by 3 power amplifier chips of 1W amplifying circuit in parallel, by radio frequency
Signal is amplified to 3W, is launched from antenna opening.
Flow is received with transmitting flow just completely conversely, main process is as follows：
A) the 420MHz radiofrequency signals for receiving antenna enter line level and are not more than -10dBm protections by limiter first
Limitation, prevents rear end receiver from burning, and then again adjusts the electricity that LNA and three dB bandwidth that radiofrequency signal passes through 10dB are 8Mhz
Filter process.
B) radiofrequency signal after treatment and frequency synthesizer 350MHz signals are carried out into down coversion and is mixed to intermediate frequency 70MHz letters
Number, signal level range is 0~-50dBm；
C) intermediate-freuqncy signal is re-fed into A/D carries out analog to digital conversion, FFT, then carry out QPSK demodulation, 3 × 3 deinterleave and
Turbo2/3 yards of decoding, is reduced to the subpacket data that each length is 2kb.
D) the continuous 2kb attached bags that will be received number carry out packaging treatment in sequence, are first reduced to the packet of 20kb, then enter
Row packet packaging, is finally reduced to the file of 3.5Mb.
In present invention can apply to the wireless communications environment of LAN, can realize to greatest extent in real time, two-forty,
The function of flexible networking communication, while this terminal technology additionally uses the design concept of highly integrated, miniaturization and low-power consumption, can
With minimum communication cost, the communication requirement of WLAN is met.
A kind of above-described embodiment is not intended to limit the scope of the present invention..It is any in spirit of the invention
With the modification equivalent made within principle and improve etc., be all contained within protection scope of the present invention.
Claims (1)
1. a kind of LAN terminal based on uhf band, it is characterised in that：Signal is received through limiter, bandpass filter and low
Make an uproar after putting, give electrically tunable filter, the output signal of electrically tunable filter is believed through the 350MHz of quadrature demodulator and frequency synthesizer
Number down coversion mixing is carried out, be converted to ABB i/q signal, after being sampled through ADC, the output of digital baseband i/q signal arrived
FPGA, FPGA carry out FFT, QPSK demodulation, 3 × 3 deinterleavings and Turbo2/3 yards of decoding to digital baseband I/Q signal, also
Originally it was subpacket data that each length is 2kb, subpacket data number was carried out into packaging treatment in sequence, then carry out packet spelling
Bag, reduction obtains file；File declustering to be sent is packet by FPGA, then is split as the attached bag number that each length is 2kb
According to being encoded to each subpacket data row Turbo code 2/3,3 × 3 matrix intersectors, QPSK modulation and IFFT conversion, the digital base of generation
Band i/q signal, ABB i/q signal is converted to by DAC, is carried out with the 350MHz signals of frequency synthesizer through quadrature modulator
Up-conversion is mixed, and is converted to the analog signal of frequency in uhf band, then is exported through transmitting path, transmitting path include wave filter,
Power amplifier, frequency synthesizer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2015109695142 | 2015-12-22 | ||
| CN201510969514 | 2015-12-22 |
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| CN106789102A true CN106789102A (en) | 2017-05-31 |
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| CN201611173989.1A Pending CN106789102A (en) | 2015-12-22 | 2016-12-19 | A kind of LAN terminal based on uhf band |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109639292A (en) * | 2019-01-03 | 2019-04-16 | 西安航天天绘数据技术有限公司 | A kind of wireless self-networking communication station based on high-speed data processing FPGA architecture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639292A (en) * | 2019-01-03 | 2019-04-16 | 西安航天天绘数据技术有限公司 | A kind of wireless self-networking communication station based on high-speed data processing FPGA architecture |
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Application publication date: 20170531 |