CN105450255A - High-efficiency high-reliability burst communication method - Google Patents
High-efficiency high-reliability burst communication method Download PDFInfo
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- CN105450255A CN105450255A CN201510749823.9A CN201510749823A CN105450255A CN 105450255 A CN105450255 A CN 105450255A CN 201510749823 A CN201510749823 A CN 201510749823A CN 105450255 A CN105450255 A CN 105450255A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
Abstract
The invention, which belongs to the technical field of communication, particularly relates to a high-efficiency high-reliability burst communication method. Compared with the prior art, the method is characterized in that on the basis of a novel algorithm, a pilot frequency (leading) sequence is deleted by combining an internet-of-things typical application scene; and because of the short communication distance, an error correction code is deleted and a CRC verification code is used for replacement on the premise that the communication reliability is guaranteed. According to the concrete embodiment, periodicity and autocorrelation of a spreading code are utilized ingeniously and bit synchronization of a signal is calculated by the output of a spread spectrum matching filter; and the false alarm probability and error code probability are minimized by using CRC verification. Therefore, the data modulation efficiency and the universality are high; and because of simple structure of transmitting and receiving terminals, the costs are low.
Description
Technical field
The invention belongs to communication technical field, be specifically related to a kind of burst communication method of high efficiency high reliability.
Background technology
Along with the rise of Internet of Things trend, in actual demand, often need a system can hold communication unit as much as possible, but the information capacity of each communication unit does not need too large, such as a storage storehouse is as an intellectualizing system, manager can wish storage area to segment as much as possible, more precisely can carry out access and the management of goods so faster.Each subregion, as a communication node, stores the article No. of goods, quantity and residue storage capacity to report one's respective area, office terminal.Want to realize such system as seen, the general information transmit-receive pattern adopting burst communication, expands power system capacity as far as possible.
Briefly introduce the current state of the art based on burst communication technology below:
A kind of HF burst channel system (" radio communication technology " the 29th volume the 4th phase in 2003) that Xian Electronics Science and Technology University proposes, its main employing 32 times of spread spectrums, spreading rate 76.8kbps, 1/2 convolution error correcting code, information rate 2.4kbps.Within the system, each send effective information before need transmission 52 symbols as tasks such as spreading code identification, synchronous and frequency difference estimation.Effective information is through 1/2 error correction coding simultaneously, needs the symbol quantity of transmission double.Visible, if each effective information negligible amounts sent, so the modulation efficiency of this system can not be too high, causes waste.
As mentioned above, what all need consideration information in the technology of general burst communication catches with synchronous, common way sent one section of pilot tone (leading) sequence before transmission effective information for this reason, by pilot capture and tracking, frame head catch to complete with Phase Tracking etc. receive and dispatch synchronous, simultaneously in order to ensure communication quality, generally add error correction coding, and then complete the transfer function of information.The overhead caused because of synchronizing signal is like this comparatively large, and modulation efficiency is low, and especially when whole network node quantity is large, but when each node transmission data volume is little, low modulation efficiency will restrict network node quantity and network information capacity.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: in order to improve modulation efficiency, how to provide a kind of burst communication method of high efficiency high reliability, to reduce Project Realization difficulty and cost, is applicable to the application scenarios of multinode, short message, burst communication.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of burst communication method of high efficiency high reliability, it comprises Data Modulation transmission phase and conciliates the transfer receipts stage, and the method specifically comprises the steps:
Step S1: carry out CRC check coding to message bag will be launched;
Step S2: 40 Bit datas of having encoded are added 0 bit as difference initial value, then carry out differential coding;
Step S3: intactly then the spreading code cycle is multiplied with it by corresponding one of each bit of the data through differential coding, completes band spectrum modulation;
Step S4: the data through band spectrum modulation are carried out constant enveloped modulation according to spread-spectrum code rate;
Step S5: signal is carried out if sampling by AD sampling unit at receiving terminal, or carry out zero intermediate frequency sampling; When underway frequency sampling, then carry out Digital Down Convert at digital baseband, become zero intermediate frequency signals, be then divided into I, Q two-way to send into low pass filter;
Step S6: I, Q two paths of signals that low pass filter exports send and two-way spreading code matched filter respectively, and carry out data despreading process, matched filter exports despread data with spread-spectrum code rate;
Step S7: matched filter Output rusults is divided into two-way; One tunnel carries out carrying out quadratic sum to I, Q signal, obtains the correlation of despread signal, i.e. field intensity; Another road is by signal stored in the shift register with tap, and tap is spaced apart spread code length, and number of taps is transmitting terminal symbol quantity;
Step S8: carry out slip ratio comparatively according to the correlation of signal after despreading and noise threshold, find the correlation peak of useful signal, once there is the correlation being greater than noise gate, and repeat with the spreading code cycle, this cycle peak signal so tentative is relevant peaks; Due to corresponding with a complete spreading period at band spectrum modulation end data symbol, therefore utilize the position of correlation peak namely can extract bit synchronization signal;
Step S9: in the step s 7, signal, stored in the shift register with tap, utilizes bit synchronization signal, is read by the data tap in shift register now, first carries out calculus of differences, then send and CRC check device;
Step S10:CRC checker completes the verifying work of data within a spreading code cycle; If verification succeeds, then think that receiving data is useful data, otherwise be invalid data; So far, whole Data Modulation and demodulating process is completed.
(3) beneficial effect
Compared with prior art, bond networking typical apply scene of the present invention, utilizes new algorithm, delete pilot tone (leading) sequence, because communication distance is near, under the prerequisite ensureing communication reliability, delete error correction coding, replace with CRC check code.
In specific implementation, make use of spreading code periodicity and autocorrelation cleverly, calculated the bit synchronization of signal by the output of spread spectrum matched filtering, utilize CRC check to reduce false alarm probability and bit error probability to greatest extent simultaneously.Not only Data Modulation efficiency is high, highly versatile, and sending and receiving end structure is all very simple, is conducive to low cost and realizes.
Compared with existing burst communication, major advantage of the present invention has that modulation efficiency is high, transmitting time is short, and power system capacity is large, and communication performance is reliable.What realize with success at present is applied as example, and in this application, spread spectrum code length 32, spread-spectrum code chip speed is 5MHz, Bao Changwei 32bit, CRC code length is 8, and modulation waveform is SFSK constant enveloped modulation, supports 256 communication nodes.Can calculate the time once facilitating communication only has about 256us, if each node with a second for the cycle send once, so in theory at the nodes nearly 4000 that namely same frequency can hold, certainly the impact of the factor such as transmission cycle, main frame response sending random collision, node is considered, actual open ended nodes is less than 4000, but the nodes that nonetheless, this application can be supported also much larger than 256, will enough meet the application demand of most of Internet of Things.
Accompanying drawing explanation
Fig. 1 is the main flow chart of technical solution of the present invention.
Fig. 2 is the shift register structure figure of technical solution of the present invention.
Embodiment
For making object of the present invention, content and advantage clearly, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
For solving the problem of prior art, the invention provides a kind of burst communication method of high efficiency high reliability, as Figure 1-Figure 2, it comprises Data Modulation transmission phase and conciliates the transfer receipts stage, and the method specifically comprises the steps:
Step S1: carry out CRC check coding to message bag will be launched, wherein, do not limit the length of message bag and CRC code length, packets of information is longer, and modulation efficiency is higher, but sending duration is longer, and the demodulation resource that receiving terminal takies is more; CRC code length is longer, and loss is lower, but modulation efficiency is lower; Here for convenience's sake, to wrap long 32 bits, CRC8 citing is discussed;
Step S2: 40 Bit datas of having encoded are added 0 bit as difference initial value, then carry out common differential coding;
Step S3: intactly then the spreading code cycle is multiplied with it by corresponding one of each bit of the data through differential coding, completes band spectrum modulation; Wherein, spread spectrum code length does not limit equally, but when same code rate, the longer spreading gain of spread code length is higher, but information rate is lower, and despreading resource requirement is more; In order to ignore the impact of frequency deviation at receiving terminal, spreading code code check can not be too low, in other words, can not be too low by the data rate of spread spectrum, suggestion is not less than 200kbps;
Step S4: the data through band spectrum modulation are carried out constant enveloped modulation according to spread-spectrum code rate; Adopt the object of constant enveloped modulation algorithm to be reduce the non-linear power leakage of bringing secondary lobe of signal due to transmission channel, non-perseverance also can be adopted to cover modulation, and modulation system is not limit, and adopts MSK modulation the most common in this example;
Step S5: signal is carried out if sampling by AD sampling unit at receiving terminal, or carry out zero intermediate frequency sampling; When underway frequency sampling, then carry out Digital Down Convert at digital baseband, become zero intermediate frequency signals, be then divided into I, Q two-way to send into low pass filter;
Step S6: I, Q two paths of signals that low pass filter exports send and two-way spreading code matched filter respectively, and carry out data despreading process, matched filter exports despread data with spread-spectrum code rate;
Step S7: matched filter Output rusults is divided into two-way; One tunnel carries out carrying out quadratic sum to I, Q signal, obtains the correlation of despread signal, i.e. field intensity; Another road is by signal stored in the shift register with tap, and tap is spaced apart spread code length, and number of taps is transmitting terminal symbol quantity, and tap is spaced apart 32 in this instance, and number of taps is 40, and shift register structure is as Fig. 2;
Step S8: carry out slip ratio comparatively according to the correlation of signal after despreading and noise threshold, find the correlation peak of useful signal, once there is the correlation being greater than noise gate, and repeat with the spreading code cycle, this cycle peak signal so tentative is relevant peaks; Due to corresponding with a complete spreading period at band spectrum modulation end data symbol, therefore utilize the position of correlation peak namely can extract bit synchronization signal;
Step S9: in the step s 7, signal, stored in the shift register with tap, utilizes bit synchronization signal, is read by the data tap in shift register now, first carries out calculus of differences, then send and CRC check device;
Step S10:CRC checker both can adopt parallel organization also can adopt serial structure, but must complete the verifying work of data within a spreading code cycle; If verification succeeds, then think that receiving data is useful data, otherwise be invalid data; So far, whole Data Modulation and demodulating process is completed.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (1)
1. a burst communication method for high efficiency high reliability, is characterized in that, it comprises Data Modulation transmission phase and conciliates the transfer receipts stage, and the method specifically comprises the steps:
Step S1: carry out CRC check coding to message bag will be launched;
Step S2: 40 Bit datas of having encoded are added 0 bit as difference initial value, then carry out differential coding;
Step S3: intactly then the spreading code cycle is multiplied with it by corresponding one of each bit of the data through differential coding, completes band spectrum modulation;
Step S4: the data through band spectrum modulation are carried out constant enveloped modulation according to spread-spectrum code rate;
Step S5: signal is carried out if sampling by AD sampling unit at receiving terminal, or carry out zero intermediate frequency sampling; When underway frequency sampling, then carry out Digital Down Convert at digital baseband, become zero intermediate frequency signals, be then divided into I, Q two-way to send into low pass filter;
Step S6: I, Q two paths of signals that low pass filter exports send and two-way spreading code matched filter respectively, and carry out data despreading process, matched filter exports despread data with spread-spectrum code rate;
Step S7: matched filter Output rusults is divided into two-way; One tunnel carries out carrying out quadratic sum to I, Q signal, obtains the correlation of despread signal, i.e. field intensity; Another road is by signal stored in the shift register with tap, and tap is spaced apart spread code length, and number of taps is transmitting terminal symbol quantity;
Step S8: carry out slip ratio comparatively according to the correlation of signal after despreading and noise threshold, find the correlation peak of useful signal, once there is the correlation being greater than noise gate, and repeat with the spreading code cycle, this cycle peak signal so tentative is relevant peaks; Due to corresponding with a complete spreading period at band spectrum modulation end data symbol, therefore utilize the position of correlation peak namely can extract bit synchronization signal;
Step S9: in the step s 7, signal, stored in the shift register with tap, utilizes bit synchronization signal, is read by the data tap in shift register now, first carries out calculus of differences, then send and CRC check device;
Step S10:CRC checker completes the verifying work of data within a spreading code cycle; If verification succeeds, then think that receiving data is useful data, otherwise be invalid data; So far, whole Data Modulation and demodulating process is completed.
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| CN106685475A (en) * | 2016-11-23 | 2017-05-17 | 天津津航计算技术研究所 | High rate burst communication method and system thereof |
| CN109150233A (en) * | 2018-09-13 | 2019-01-04 | 南京理工大学 | A kind of modulation-demo-demodulation method of direct expansion dpsk signal |
| CN109660325A (en) * | 2017-10-12 | 2019-04-19 | 中兴通讯股份有限公司 | Data processing method and device |
| CN112787965A (en) * | 2020-12-30 | 2021-05-11 | 华中科技大学 | Data transmission method, device and system |
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| CN106685475A (en) * | 2016-11-23 | 2017-05-17 | 天津津航计算技术研究所 | High rate burst communication method and system thereof |
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| CN109150233A (en) * | 2018-09-13 | 2019-01-04 | 南京理工大学 | A kind of modulation-demo-demodulation method of direct expansion dpsk signal |
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Application publication date: 20160330 |