CN101459968A - Remote distance wireless transmission method - Google Patents
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Abstract
The invention provides a remote wireless transmitting method for self-adaptively adjusting optimum modulation modes under the precondition that the communication quality is guaranteed. The modulation mode comprises: sending a series of test data to an information sink by an information source, determining to adopt one of QPSK, 16QAM, 64QAM or 126QAM as a transmission system according to the bit error rate and the transmission speed of the test data by the information sink, feeding back to the information source, modulating to a corresponding transmission system according to feedback information of the information sink by the information source, then, sending data to the information sink, selecting a suitable transmission system according to the bit error rate and the transmission speed of received data by the information sink, feeding back to the information source, adjusting a corresponding transmission system and the speed in real time according to the feedback information of the information sink by the information source, sending the data to the information sink, and thereby self-adaptively realizing the optimization of the data transmission efficiency according to the transmission environment and the speed demands. The method is applied in wireless data digital transmission with long distance and high speed.
Description
Technical field
The present invention relates to a kind of communication means, be particularly related to the remote distance wireless transmission method of a kind of suitable long distance, two-forty, it is applied to point-to-point under the common and special environment condition such as public's telecommunications, private network communication, point-to-multipoint, fields such as the expansion of end-to-end transfer of data, particularly wireless access, transmission link, existing communication channel, low-cost route application, long-distance communication links, cellular basestation connection, railway communication and military communication.
Background technology
The design of public wireless communication system all is based on static, and promptly after national radio control department assignment frequency range, communication system can only be worked on the proprietary frequency range of assignment, uses proprietary single modulator/demodulator, channel agreement etc.Even the multiband phone also only switches between predefined several frequency ranges, this design normally is basis with the conventional environment, can not utilize frequency range very fully.Static Design has not only reduced the utilance of radio frequency band, and is also influential in others, and for example in the mobile communication system, the user can be transmitted data in system during the free time, but this can not improve the utilance of message transmission rate and frequency range.If system can analyze residing communications environment automatically, the transmission modulation classification of real-time adaptive adjustment self or use idle frequency range outside original designated frequency band, can greatly change the availability of frequency spectrum so undoubtedly, make the user can obtain the bandwidth outside specified and don't need to increase extra expense.
Under some special demands, downstream signal need carry out the transmission or the large-capacity data of point-to-multipoint and download, if up-downgoing this moment takies the same resource of frequency range, certainly will cause waste, therefore being necessary to adjust modulation system automatically according to volume of transmitted data, to make system be 10 satisfying the error rate
-8Situation under make system possess the data on flows transmittability of burst.
Further, because relatively freely using of frequency range makes the confidentiality of communication reduce, in some special occasions, the encryption of baseband signal is a major issue that must solve.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can guarantee under the prerequisite of communication quality the remote distance wireless transmission method of the best modulation system of coupling automatically.
For realizing aforementioned purpose, the technical solution adopted in the present invention is such: a kind of remote distance wireless transmission method, comprise that the self adaptation of idle frequency spectrum inserts and transmit the self adaptation adjustment of standard, and the self adaptation adjustment of described transmission standard comprises the steps:
1) information source sends a string test data to the stay of two nights;
2) stay of two nights determines to adopt among QPSK, 16QAM, 64QAM or the 128QAM any as the transmission modulation classification and feed back to information source according to the error rate of test data and transmission rate;
3) information source is modulated to the respective transmissions modulation classification according to the feedback information of the stay of two nights and then data is sent to the stay of two nights;
4) stay of two nights is selected suitable transmission modulation classification and is fed back to information source according to the error rate and the transmission rate of received data, information source is adjusted corresponding transmission modulation classification in real time according to the feedback information of the stay of two nights and then data is sent to the stay of two nights, so hockets and realizes the optimization of transfer of data.
Above-mentioned remote distance wireless transmission method, the following encryption method of the The data of being transmitted:
1), the Frame encapsulation format of information source is set to be made up of frame synchronization head and a plurality of subframe, comprises synchronizing sub-frame head and a plurality of packet in each subframe, comprises yard synchronous head and transmission data in each packets of information;
2), data carried out FPGA cryptographic algorithm encoding process dynamically be placed on again in one or more packet, other vacant packet is filled by pseudo noise code;
3), information source is noted the data of synchronous code information such as the frame synchronization head, synchronizing sub-frame head of store data and sign indicating number synchronous head after together with coding and is sent to the stay of two nights by the transmission modulation classification of setting;
4) stay of two nights is according to the frame synchronization information that receives, and the residing subframe position of judgment data according to the residing Frame of synchronizing sub-frame judgment data position, finds corresponding packet and carry out the FPGA decrypt operation according to synchronous code information to obtain the data transmitted.
By adopting the aforementioned techniques scheme, the invention has the beneficial effects as follows: by adopting Adaptive Modulation standard and idle frequency range access technology, system can dynamically adapt to variation such as modulation, coding, channel agreement and the bandwidth etc. of the arbitrary link in the spectrum environment, farthest increase the availability of frequency spectrum thereby on hyperspace, insert frequency range, remove the limitation of Static Design.Simultaneity factor changes modulation classification automatically according to the change of environment under the prerequisite that guarantees communication quality, both satisfied the burst flow data transmission capabilities, can adjust suitable transmission rate automatically again, avoids the waste of resource.Further the improvement system satisfies when directional transmissions that the cipher mode to data adopts complicated more base band data cryptographic algorithm under the prerequisite of communication quality, makes system transmissions safety obtain more reliable guarantee.
Description of drawings
Fig. 1 is the system flow block diagram of embodiment;
Fig. 2 is an embodiment coding module system block diagram;
Fig. 3 is an embodiment decoder module system block diagram;
Fig. 4 is an embodiment modulation system system block diagram;
Fig. 5 is an embodiment data encapsulation structural representation;
Embodiment
In known wireless transmitting system, the self adaptation of having developed idle frequency spectrum inserts, disclosed Chinese patent CN101039462A disclosed a kind of method of the dynamic frequency selection between basic service set at same channel as on September 19th, 2007, first device is by carry out consulting to obtain the channel that the channel that first device will use and second device will use and the information of this channel with second device, by adopting negotiation method to make that idle channel can be common for a plurality of communication systems that possess the self adaptation access function, really improve the availability of frequency spectrum.On this basis, the remote distance wireless transmission method that provides of embodiment also comprises the automatic control of transmitting standard.
Referring to figs. 1 to Fig. 5, embodiment provides a kind of remote distance wireless transmission method, and it can realize that real-time full duplex is point-to-point, and the point-to-multipoint transmission reaches the speech of burst, data such as image continuously.
At hardware aspect, it comprises radiating portion and receiving unit:
1, radiating portion: insert the information source physical layer link by data-interface G.703, the information source data are the frame format of E1 framing with data encapsulation through E1 transmitting-receiving interface chip, data processing through raising transmission qualities such as error control codings, by the QPSK digital modulation module, be modulated into the digital signal of 33MHz intermediate frequency, through 10 D/A conversion, convert analog if signal to and launch.
2, receiving unit: the analog intermediate frequency signal that receives is passed through the A/D conversion, convert digital medium-frequency signal to, through digital demodulation, demodulate modulation signal, through the data processing such as error control decoding of data processing unit, be reduced to into frame data format, and by the transmitting-receiving interface chip data to be separated frame be raw baseband signal, and, insert stay of two nights physical layer link by data-interface.
Wherein burst modulation demodulation control unit is mainly handled bursty data and the clock synchronization and the Frame of data is handled etc., microcontroller mainly is to the digital modulation demodulation module and burst modulation demodulation control module is controlled and initial condition is loaded setting, and by RS-485 interface and compunication.The technical indicator of hardware aspect is as follows:
1, working method: point-to-point, point-to-multipoint, end-to-end, full duplex
2, IF-FRE scope: 30～140MHz
3, bandwidth range: 2MHz～5MHz
4, modulation demodulation system: QPSK, QAM
5, data-interface: interface G.703
6, data processing: forward error correction, data interlacing access, Scrambler encoding and decoding, R-S encoding and decoding etc.
7, data rate: n * E1 (n * 2.048Mbit/s) (optional)
8, the error rate: 10
-8
9, alarm function: loss of signal alarm/OOF alarm/multiframe out-of-sync. alarm/error code alarm/remote alarm
10, operating temperature range :-40 ℃ to+85 ℃.
The automatic control of the transmission standard among the embodiment comprises the steps:
1) information source sends a string test data to the stay of two nights;
2) stay of two nights determines to adopt a kind of among QPSK, 16QAM, 64QAM or the 128QAM as the transmission standard and feed back to information source according to the error rate of test data and transmission rate;
3) information source is modulated to the respective transmissions standard according to the feedback information of the stay of two nights and then data is sent to the stay of two nights;
4) stay of two nights is selected suitable transmission standard and is fed back to information source according to the error rate and the transmission rate of received data, information source is adjusted corresponding transmission standard in real time according to the feedback information of the stay of two nights and then data is sent to the stay of two nights, so hockets and realizes the maximization of message transmission rate.
Present embodiment is mainly realized asymmetric transmission, and for example in the TDMA/FDD mode, a kind of more excellent feasible transmission mode is: upstream data adopts the mode of burst packet, adopts the low relatively modulation system (as QPSK) of modulation efficiency; Downlink data adopts the mode of broadcasting, adopts the high relatively modulation system (as 16QAM) of modulation efficiency.This asymmetric transmission can realize that on the one hand dynamic bandwidth allocation is to improve spectrum utilization efficiency according to user's actual demand; Reduced the bit number of the every symbol transmission of upward signal on the other hand, thereby reduced the difficulty of base station burst demodulation algorithm, can satisfy the above modulator-demodulator that is used for subscriber station that requires and must possess such performance: broadband continuous signal that can demodulation high modulate efficiency (as 16QAM), simultaneously again can chopping phase to the broadband burst of low modulation efficient (as QPSK).Present embodiment is realized the adjustment of adaptive modulation-demodulation standard by the method.
Special-purpose error rate detection chip is adopted in the error rate test section of present embodiment, and the error rate situation of supervisory channel, and timing in real time sends monitor message to microcontroller and carries out control and treatment.
The microcontroller part is finished by AVR single chip computer AT Mega64, realizes the setting to each chip register, the loading of initial condition, monitoring in real time etc.
The embodiment of transmission standard encrypt and decrypt:
With reference to figure 1, Fig. 5, coffret is finished transmitting and receiving terminal encrypting and decrypting function by the FPGA of ALTER company, transmitting terminal will be encapsulated as the frame format of similar E1 framing from the information source data that G.703 receive from the E1 interface chip and by this chip, its information source physical layer link connects the E1 interface through transducer V.35-G.703, whole 2.048M is used as a link, adopt similar E1 framing frame encapsulating structure, the frame swynchronization code of a time slot is dragged the data frame format of the data of certain-length.For example: the 0th time slot is used for the transmission frame synchronous code, and all the other 31 time slots can be used for secured transmission of payload data.Be the data that whole E1 link will transmit same signal source, its speed reaches 2.048Mbit/s, and the error rate reaches 10
-8This part can realize dropout/OOF/multiframe out-of-sync./error code alarm/remote alarm, the E1 interface parameters is with V.35-G.703 interface is consistent, impedance matching is nonequilibrium 75ohm, reads dropout/OOF/multiframe out-of-sync./information such as error code alarm/remote alarm by E1 interface chip related register.
Finish the receiving terminal encryption from the data that the E1 interface transmits out by FPGA, draw three pins on the FPGA, data wire, clock line, enable line three root interface, data wire is used to receive data, when enable line is low level, expression has data to transmit, begin to receive data, rising edge at receive clock, receive the one digit number certificate, the data that receive are temporarily stored into the SRAM that can visit with FPGA, utilize FPGA can handle the ability of a plurality of routines simultaneously, the data that receive are packaged into Frame one by one through cryptographic calculation, and specific embodiment is as follows:
1), the Frame encapsulation format of information source is set to be made up of frame synchronization head and a plurality of subframe, comprises synchronizing sub-frame head and a plurality of packet in each subframe, comprises yard synchronous head and transmission data in each packets of information;
2), data carried out FPGA cryptographic algorithm encoding process dynamically be placed on again in one or more packet, other vacant packet is filled by pseudo noise code;
3), information source is noted the data of synchronous code information such as the frame synchronization head, synchronizing sub-frame head of store data and sign indicating number synchronous head after together with coding and is sent to the stay of two nights by the transmission modulation classification of setting;
4) stay of two nights is according to the frame synchronization information that receives, and the residing subframe position of judgment data according to the residing Frame of synchronizing sub-frame judgment data position, finds corresponding packet and carry out the FPGA decrypt operation according to synchronous code information to obtain the data transmitted.
Frame at useful data can adopt error detection, error correction algorithm, and CRC32 for example, error correction algorithm carries out Base-Band Processing forward, to improve the error rate.
The data of handling receive by modulation chip, the analog intermediate frequency signal of transmitting terminal modulation chip output 33MHz, analog intermediate frequency signal carries out demodulation again after filtering is amplified, data after demodulating is a data wire by three pinouts of drawing on the FPGA, clock line, enable line three root interface, data wire receives data, when enable line was low level, expression had data to transmit, and begins to receive data, rising edge at receive clock, receive the one digit number certificate, the data that receive are temporarily stored into the SRAM that can visit with FPGA, FPGA carries out the data decryption Base-Band Processing.Utilize FPGA can handle the ability of a plurality of routines simultaneously, the data that receive are through decrypt operation, and the irrelevant filler code of removal.
Decipherment algorithm embodiment is as follows:
1) according to the frame synchronization information that receives, the residing subframe position of judgment data, according to the residing Frame of synchronizing sub-frame judgment data position, find corresponding packet according to synchronous code information, Frame and extraneous data that remove to disturb will have data to obtain the data transmitted according to carrying out the FPGA decrypt operation.
2) data that will decipher are carried out the CRC32 error detection that improves the error rate such as error correction forward, and the part error code is corrected in the error correction computing, and calculate by the useful data batching counter, and the error rate of calculating, carry out error rate calculation, measure the error rate and inform microcontroller.
Remote distance wireless transmission method provided by the present invention is widely used in that Point-to-Point Data Transmission, particularly wireless access, transmission link, the expansion of existing communication channel, route application cheaply, long-distance communication links, cellular basestation under public's telecommunications and the various environmental conditions of private network communication connects, railway communication and military channels are used.Also can be used for the transfer of data of communication, wireless Internet access etc. between the stronger information source transfer of data of real-time, visual telephone, cellular basestation, also be applicable to multiple fields such as wireless VPN, Wireless VoIP, wireless video.It is abominable that its good temperature characterisitic can be applicable to environment, and the Ethernet data in difficult wiring area covers, and saves the engineering construction cost.Can be applicable to the key image transmission of video monitoring system through upconversion process, the wireless transmitting system of multichannel IP telephone access switch, broadband networks wireless access such as campus, hotel, sub-district, Internet bar, fixed telephone bar wireless access, the various application occasions such as road that are linked back on the WLAN focus, special-purpose broadband networks wireless access such as the tax, medical treatment, insurance and interconnection etc.
Claims (5)
1, a kind of remote distance wireless transmission method comprises that the self adaptation of idle frequency spectrum inserts, and it is characterized in that comprising the self adaptation adjustment of transmitting standard, and the self adaptation adjustment of described transmission standard comprises the steps:
1) information source sends a string test data to the stay of two nights;
2) stay of two nights determines to adopt among QPSK, 16QAM, 64QAM or the 128QAM any as the transmission modulation classification and feed back to information source according to the error rate of test data and transmission rate;
3) information source is modulated to the respective transmissions modulation classification according to the feedback information of the stay of two nights and then data is sent to the stay of two nights;
4) stay of two nights is selected suitable transmission modulation classification and is fed back to information source according to the error rate and the transmission rate of received data, information source is adjusted corresponding transmission modulation classification in real time according to the feedback information of the stay of two nights and then data is sent to the stay of two nights, so hockets and realizes the optimization of transfer of data.
2, remote distance wireless transmission method according to claim 1 is characterized in that the following encryption method of the The data of being transmitted:
1), the Frame encapsulation format of information source is set to be made up of frame synchronization head and a plurality of subframe, comprises synchronizing sub-frame head and a plurality of packet in each subframe, comprises yard synchronous head and transmission data in each packets of information;
2), data carried out FPGA cryptographic algorithm encoding process dynamically be placed on again in one or more packet, other vacant packet is filled by pseudo noise code;
3), information source is noted the data of synchronous code information such as the frame synchronization head, synchronizing sub-frame head of store data and sign indicating number synchronous head after together with coding and is sent to the stay of two nights by the transmission modulation classification of setting;
4) stay of two nights is according to the frame synchronization information that receives, and the residing subframe position of judgment data according to the residing Frame of synchronizing sub-frame judgment data position, finds corresponding packet and carry out the FPGA decrypt operation according to synchronous code information to obtain the data transmitted.
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| CNA2008101891879A CN101459968A (en) | 2008-12-31 | 2008-12-31 | Remote distance wireless transmission method |
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| CNA2008101891879A CN101459968A (en) | 2008-12-31 | 2008-12-31 | Remote distance wireless transmission method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118227A (en) * | 2011-01-14 | 2011-07-06 | 大连大学 | Variable rate communication quality control method based on satellite-to-ground communication system |
| CN102685467A (en) * | 2012-04-27 | 2012-09-19 | 中国科学院空间科学与应用研究中心 | Wireless image transmission communication system for unmanned aerial vehicle and wireless image transmission communication method |
| CN102695041A (en) * | 2012-04-27 | 2012-09-26 | 中国科学院空间科学与应用研究中心 | Unmanned plane load device with real-time wireless high resolution image transmission function |
| CN106255169A (en) * | 2016-07-20 | 2016-12-21 | 矽力杰半导体技术(杭州)有限公司 | Node device, data packet forwarding method and apply its mesh network system |
| CN107846423A (en) * | 2017-12-25 | 2018-03-27 | 上海物麒科技有限公司 | The method of bandwidth self-adaption in being transmitted for power-line carrier communication system |
| CN111225360A (en) * | 2020-04-17 | 2020-06-02 | 北京全路通信信号研究设计院集团有限公司 | Narrow-band wireless communication system and method |
| CN114826482A (en) * | 2022-03-22 | 2022-07-29 | 河南中多科技发展有限公司 | Self-adaptive method for through-the-earth data transmission rate |
-
2008
- 2008-12-31 CN CNA2008101891879A patent/CN101459968A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118227A (en) * | 2011-01-14 | 2011-07-06 | 大连大学 | Variable rate communication quality control method based on satellite-to-ground communication system |
| CN102118227B (en) * | 2011-01-14 | 2013-05-08 | 大连大学 | Variable rate communication quality control method based on satellite-to-ground communication system |
| CN102685467A (en) * | 2012-04-27 | 2012-09-19 | 中国科学院空间科学与应用研究中心 | Wireless image transmission communication system for unmanned aerial vehicle and wireless image transmission communication method |
| CN102695041A (en) * | 2012-04-27 | 2012-09-26 | 中国科学院空间科学与应用研究中心 | Unmanned plane load device with real-time wireless high resolution image transmission function |
| CN106255169A (en) * | 2016-07-20 | 2016-12-21 | 矽力杰半导体技术(杭州)有限公司 | Node device, data packet forwarding method and apply its mesh network system |
| CN107846423A (en) * | 2017-12-25 | 2018-03-27 | 上海物麒科技有限公司 | The method of bandwidth self-adaption in being transmitted for power-line carrier communication system |
| CN111225360A (en) * | 2020-04-17 | 2020-06-02 | 北京全路通信信号研究设计院集团有限公司 | Narrow-band wireless communication system and method |
| CN114826482A (en) * | 2022-03-22 | 2022-07-29 | 河南中多科技发展有限公司 | Self-adaptive method for through-the-earth data transmission rate |
| CN114826482B (en) * | 2022-03-22 | 2024-03-26 | 河南中多科技发展有限公司 | self-adaptive method for through-the-earth data transmission rate |
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Application publication date: 20090617 |