CN101394390B - Spectrum-spread type PDH microwave communication system and method - Google Patents
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Abstract
The invention provides a spectrum-spreading PDH microwave communication system and a method. The system comprises a transmitting device consisting of a broadband spectrum-spreading module, a medium frequency modulation module and a microwave emitter; a receiving device consisting of a broadband de-spreading module, a medium frequency demodulation module and a microwave receiver; an OFDM modulation module consisting of a first serial-to-parallel module, an IFFT module and a first parallel-to-serial module; and an OFDM demodulation module consisting of a second serial-to-parallel module, a FFT module and a second parallel-to-serial module, wherein the broadband spectrum-spreading module includes broadband spectrum-spreading sub-modules numbering N connected with each other in parallel between the first serial-to-parallel module and the IFFT module; and the broadband de-spreading module comprises N broadband de-spreading sub-modules connected with each other in parallel between the FFT module and the second parallel-to-serial module. The system can improve the RF spectrum utilization rate of spectrum-spreading microwave, increase number of independent channels, obviate mutual interface among spectrum-spreading microwaves in the same area, and remarkably improve spreading gain.
Description
Technical field
The present invention relates to wireless communication field, particularly a kind of spectrum-spread type PDH microwave communication system and method.
Background technology
In several years in the past, solving on the point-to-point wireless transmission problem, people have adopted a large amount of PDH microwaves, i.e. PDH (Pseudo-synchronous Digital Hierarchy) (Plesiochronous Digital Hierarchy, PDH) microwave.They have 7G/8G, and 13G/15G is also arranged, and they all do not adopt spread spectrum, and we claim that they are conventional PDH microwave.Along with the continuous development of the communication technology, people improve gradually to the requirement of communication quality, and these conventional PDH microwaves can not satisfy the requirement of wireless data transmission.Spread spectrum communication (Spread Spectrum Communication) is the important breakthrough of the contemporary communication technology, last century the nineties, civilian spread spectrum microwave is arisen at the historic moment, people more and more are applied to wireless data transmission with spread spectrum, and spread spectrum microwave has been compared following advantage with conventional PDH microwave:
(1) antijamming capability is strong, and the error rate is low, can reach 10
-10, the error rate of conventional PDH microwave is 10
-8
(2) far away, the saving relay station of communication distance.
(3) ability of anti-multipath strong, can stride well operation under the situation of the water surface, it is the dead band that conventional PDH microwave is looked the water surface usually.
(4) it is more much better than conventional PDH microwave to penetrate blocking capability and non line of sight communication capacity.
But in use also there are some problems in spread spectrum microwave:
(1) theoretical foundation of spread spectrum communication is to exchange signal to noise ratio for bandwidth, and huge signal to noise ratio is improved and extremely strong interference free performance is a cost to sacrifice bandwidth.Therefore, the radio spectrum utilance of spread spectrum microwave communication system is low, and independent channel is few, and causes phase mutual interference between the spread spectrum microwave of areal work easily.
(2) for the spread spectrum microwave of 5.8G, available bandwidth has only 125MHz, an E1 data flow diffuses into the spreading gain that 120M just can reach 17dB, therefore, the spreading gain of existing spread spectrum microwave between 10dB～17dB, says strictly that generally they can only be called " accurate spread spectrum microwave ", real spread spectrum microwave, its spreading gain at least will be on 20dB.
Therefore, development has high spreading gain, and the spectrum-spread type PDH microwave that takies very narrow radio frequency bandwidth has simultaneously again just become current urgency problem to be solved.
Summary of the invention
The present invention's applied spread spectrum microwave radio spectrum utilance when solving in the prior art point-to-point wireless data transmission is low, independent channel is few, with phase mutual interference between the spread spectrum microwave in area, the problem that spreading gain is low provides a kind of spectrum-spread type PDH microwave communication system and method.
Technical scheme of the present invention is as follows:
A kind of spectrum-spread type PDH microwave communication system comprises emitter and receiving system, and described emitter comprises spread spectrum module, intermediate frequency Modulation module and microwave transmitter, and described receiving system comprises despreading module, intermediate frequency demodulation module and microwave receiver,
Described emitter also comprises the OFDM modulation module, described OFDM modulation module comprises that also module, inverse fast fourier transform module and first are also changeed the string module in the first string commentaries on classics that sets gradually, described first string changes and module receives the data flow of launching client, and data flow resolved into N road parallel sub-stream pairs, described inverse fast fourier transform module connects first and change the string module, described first and change the string module and links to each other with microwave transmitter by the intermediate frequency Modulation module; Described spread spectrum module is the wide-band spread spectrum module, comprise N parallel with one another the wide-band spread spectrum submodule that is arranged on the first string commentaries on classics and module and inverse fast fourier transform intermodule, be used for that N road parallel sub-stream pairs is carried out wide-band spread spectrum respectively and handle the parallel spread spectrum sub data flow in generation N road;
Described receiving system also comprises the OFDM demodulation module, described OFDM demodulation module comprises that also module, fast Fourier transform module and second are also changeed the string module in the second string commentaries on classics that sets gradually, described second string changes and module links to each other with microwave receiver by the intermediate frequency demodulation module, and the signal of receiving gone here and there and change after be sent to fast Fourier transform module, demodulate the parallel spread spectrum sub data flow in N road by fast Fourier transform module, described second also changes the string module is connected to the reception client; Described despreading module is a broadband despreading module, comprise being arranged on N parallel with one another the broadband despreading submodule that fast Fourier transform module and second is also changeed the string intermodule, be used for that the parallel spread spectrum sub data flow in N road is carried out broadband despreading processing respectively and be reduced into N road parallel sub-stream pairs.
Described wide-band spread spectrum module is a broadband pseudo-code spread spectrum module, and described wide-band spread spectrum submodule is a broadband pseudo-code spread spectrum submodule; Described broadband despreading module is a broadband pseudo-code despreading module, and described broadband despreading submodule is a broadband pseudo-code despreading submodule.
Described emitter also comprises the coding spread spectrum coding module, described coding spread spectrum coding module be arranged at that first string that the data flow of emission client enters changes and module before, being used for that the data flow of emission client is carried out sending into first string after the encoding process changes and module; Described receiving system also comprises the coding spread spectrum decoder module, and described coding spread spectrum decoder module is arranged at second and change the string module and receive between the client, be used for second and the data flow of changeing the output of string module carry out delivering to the reception client again after the decoding processing.
A kind of spectrum-spread type PDH microwave communication method comprises the steps:
A, to the emission client data to be transmitted stream go here and there and conversion process resolve into N road parallel sub-stream pairs, respectively every way data flow being carried out wide-band spread spectrum again handles, the parallel spread spectrum sub data flow in the N road that forms carried out carrying out again after the orthogonal sub-carriers modulation through inverse fast fourier transform and go here and there conversion process generating baseband signal, with the emission of radio frequency signals that generates after baseband signal process intermediate frequency Modulation, the upconversion process in wireless channel;
B, receiving terminal to the radiofrequency signal that receives steps A and launch carry out down-conversion, the intermediate frequency demodulation treatment conversion is a baseband signal, also the parallel spread spectrum sub data flow in N road is isolated in conversion process, fast Fourier transform demodulation through string, then respectively every road spread spectrum sub data flow is carried out the broadband despreading and handle, process and string are converted to original serial data stream and return the reception client again.
Described wide-band spread spectrum is treated to broadband pseudo-code spread processing, and the despreading of described broadband is treated to broadband pseudo-code despreading and handles.
Data flow in described steps A is through carrying out the coding spread spectrum encoding process earlier before string and the conversion; Correspondingly, the serial data stream after process among the described step B and the string conversion will carry out the coding spread spectrum decoding processing and obtains original data stream and return the reception client.
Technique effect of the present invention is as follows:
A kind of spectrum-spread type PDH microwave communication system of the present invention, in existing microwave system, set up wide-band spread spectrum/despreading module, OFDM (OFDM) module, the OFDM technology is combined with wide-band spread spectrum/decoding technology, be about to wide-band spread spectrum module and broadband despreading module and be connected in the OFDM modulation/demodulation modules, both are mutually combined.The parallel spread spectrum sub data flow in N road behind the wide-band spread spectrum is carried out the orthogonal sub-carriers modulation by the inverse fast fourier transform module, again the modulation signal that generates is carried out and goes here and there to change generating baseband signal, this baseband signal only takies the bandwidth of one road spread spectrum sub data flow, reduce shared radio frequency bandwidth in the wireless data transmission process significantly, overcome the defective that existing spread spectrum microwave takies big bandwidth; Simultaneously, after the shared bandwidth of spread spectrum microwave significantly narrows down, radio spectrum utilance in a certain frequency range significantly improves thereupon, has rolled up independent channel quantity, and the method that so just can adopt frequency division to isolate overcomes the phase mutual interference between the spread spectrum microwave of areal work; In addition, the present invention adopts the OFDM technology to combine with wide-band spread spectrum/decoding technology, and used wide-band spread spectrum/decoding technology makes its spreading gain at least greater than 20dB.
Spectrum spreading method commonly used comprises: the pseudo-code spread spectrum, and frequency hopping is during jumping; Present civilian spread spectrum adopts the pseudo-code spread spectrum mostly.
From the coding spread spectrum method that the pseudo-code spread spectrum develops and, adopt Methods for Coding to finish spread spectrum, can improve the spreading gain of system.For example, the forward error correction coding/decoding is set in system, E1 (2M) data flow is handled, can obtain the spreading gain of 5dB～15dB.
The present invention also provides a kind of spectrum-spread type PDH microwave communication method, the OFDM technology is combined with wide-band spread spectrum/decoding technology, the N way data flow that resolves into is carried out wide-band spread spectrum respectively to be handled, and carry out orthogonal sub-carriers and modulate, then carry out and go here and there to change generating baseband signal, making the shared radio frequency bandwidth of its baseband signal is the shared bandwidth of one road spread spectrum sub data flow, make its shared bandwidth in transmission course press narrow greatly, therefore, improved the radio spectrum utilance, increased the independent channel number, avoided with phase mutual interference between the spread spectrum microwave in area; Adopt the wide-band spread spectrum technology, can improve spreading gain significantly.
Description of drawings
Fig. 1 is the block diagram of spectrum-spread type PDH microwave communication system of the present invention;
Fig. 2 is the flow chart of spectrum-spread type PDH microwave communication method of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The present invention is based on existing spread spectrum microwave communication system, it is improved, OFDM modulation module and OFDM demodulation module have been set up, and combine with wide-band spread spectrum module and broadband despreading module respectively, described wide-band spread spectrum/despreading is meant that spreading gain is not less than spread spectrum/despreading of 20dB, improved significantly the spread spectrum microwave radio spectrum utilance, increase the independent channel number, avoid the spread spectrum microwave phase mutual interference of areal work and improve spreading gain.
Fig. 1 is the block diagram of spectrum-spread type PDH microwave communication system of the present invention.As shown in Figure 1, comprise emitter and receiving system.
Emitter comprises the coding spread spectrum coding module, the OFDM modulation module, broadband pseudo-code spread spectrum module, intermediate frequency Modulation module and microwave transmitter, wherein the OFMD modulation module comprises that first string changes and module, inverse fast fourier transform (IFFT) module, first also changes the string module, direction encoding spread spectrum coding module according to data flow, first string changes and module, broadband pseudo-code spread spectrum module, the IFFT module, first also changes the string module, the intermediate frequency Modulation module links to each other successively with microwave transmitter, and wherein pseudo-code spread spectrum module in broadband is N parallel with one another the broadband pseudo-code spread spectrum submodule that is arranged between the first string commentaries on classics and module and the IFFT module.
Receiving system comprises microwave receiver, the intermediate frequency demodulation module, the OFDM demodulation module, broadband pseudo-code despreading module, the coding spread spectrum decoder module, wherein the OFDM demodulation module comprises that second string changes and module, fast Fourier transform (FFT) module and second is also changeed the string module, direction microwave receiver according to data flow, the intermediate frequency demodulation module, second string changes and module, the FFT module, broadband pseudo-code despreading module, second also changes the string module, the coding spread spectrum decoder module links to each other successively, and wherein broadband pseudo-code despreading module is to be arranged on FFT module and second also to change N parallel with one another the broadband pseudo-code despreading submodule of going here and there between the module.
The operation principle of spectrum-spread type PDH microwave communication system of the present invention is:
Sending into first string behind the data flow process coding spread spectrum coding that the emission client will be to be transmitted changes and module, described coding spread spectrum coding can be forward error correction coding (FEC), can also be (N, k) coding or cascaded code etc., serial data stream after first string changes and module is encoded coding spread spectrum resolves into N road parallel sub-stream pairs, export to N broadband pseudo-code spread spectrum submodule respectively, N broadband pseudo-code spread spectrum submodule carries out broadband pseudo-code spread processing to sub data flow respectively, then the parallel spread spectrum sub data flow in the N road behind the pseudo-code spread spectrum of broadband is exported to the IFFT module respectively, the IFFT module is by the method for inverse fast fourier transform, carry out the orthogonal sub-carriers modulation, exporting to first then also changes the string module and generates baseband signal, then the intermediate frequency Modulation module carries out generating intermediate-freuqncy signal and exporting to microwave transmitter after the intermediate frequency Modulation to baseband signal, and microwave transmitter carries out intermediate-freuqncy signal to convert emission of radio frequency signals again in wireless channel after the upconversion process.
The microwave receiver of receiving terminal carries out down-converted to the radiofrequency signal in the wireless channel that receives and converts intermediate-freuqncy signal to and export to the intermediate frequency demodulation module, the intermediate frequency demodulation module is carried out generating after intermediate frequency demodulation is handled baseband signal to intermediate-freuqncy signal and is exported to second string commentaries on classics and the module, then second string changes and module, the FFT module is isolated the parallel spread spectrum sub data flow in N road with baseband signal and is exported to N broadband pseudo-code despreading submodule respectively, N broadband pseudo-code despreading submodule carries out broadband pseudo-code despreading to it respectively to be handled and generates N road parallel sub-stream pairs and export to second and change the string module, second and change the N road parallel sub-stream pairs of string module after and be reduced into serial data stream and export to the coding spread spectrum decoder module with broadband pseudo-code despreading, the coding spread spectrum decoder module carries out being reduced into original data stream after the coding spread spectrum decoding processing to data stream and flows to the reception client, so far, finished all processes of wireless data transmission.
Said circumstances has only been described a client and has been provided with emitter, and another client is provided with the situation of receiving system, i.e. client emission data, and another client receives data.In the application of reality, client not only is provided with receiving system but also be provided with emitter, can outwards launch data and can receive data again, is the parallel spectrum-spread type PDH microwave communication system of two-way and finishes wireless data transmission.
In addition, also the broadband pseudo-code spread spectrum module among Fig. 1 can be positioned over the coding spread spectrum coding module and first string changes also between the module, at this moment, the emission client will be to be transmitted data flow send into the coding spread spectrum coding module and finish coding after, enter broadband pseudo-code spread spectrum module again and carry out broadband pseudo-code spread spectrum, the serial data stream behind the spread spectrum enters the OFDM modulation module again, like this, coding spread spectrum coding module and broadband pseudo-code spread spectrum module are finished wide-band spread spectrum jointly, carry out the OFDM modulation again; Correspondingly, broadband pseudo-code despreading module is positioned over second also changes between string module and the coding spread spectrum decoder module, the serial data that OFDM demodulation this moment the is come out broadband pseudo-code despreading module of flowing through is carried out broadband pseudo-code despreading, enters the coding spread spectrum decoder module again and carries out being reduced into original data stream after the decoding processing and flow to the reception client.
Fig. 2 is the flow chart of spectrum-spread type PDH microwave communication method of the present invention.
Go here and there and change the emission client is encoded data flow waiting for transmission through coding spread spectrum after and resolve into N road parallel sub-stream pairs, respectively N road parallel sub-stream pairs is carried out broadband pseudo-code spread spectrum again, then the parallel spread spectrum sub data flow in the N road that generates is carried out the orthogonal sub-carriers modulation by inverse fast fourier transform, carry out again and go here and there to change generating baseband signal, baseband signal is carried out intermediate frequency Modulation generates intermediate-freuqncy signal, again intermediate-freuqncy signal is carried out upconversion process and with the emission of radio frequency signals that generates in wireless channel;
Receiving terminal receives and carries out down-converted after the radiofrequency signal that transmitting terminal launches and be converted to intermediate-freuqncy signal, intermediate-freuqncy signal is carried out intermediate frequency demodulation generate baseband signal, also the parallel spread spectrum sub data flow in N road is isolated in conversion process, fast Fourier transform demodulation to baseband signal through string, then respectively every road spread spectrum sub data flow is carried out the broadband despreading and handle generation N road parallel sub-stream pairs, through and string being converted to serial data stream, carry out the coding spread spectrum decoding processing again and be reduced into original data flow and return the reception client.
In addition, the spread spectrum in the foregoing description/despreading module also is applicable to arrowband spread spectrum/despreading module, and correspondingly, the spread spectrum/despreading method of employing also is applicable to arrowband spread spectrum/despreading method.
Claims (6)
1. spectrum-spread type PDH microwave communication system, comprise emitter and receiving system, described emitter comprises spread spectrum module, intermediate frequency Modulation module and microwave transmitter, and described receiving system comprises despreading module, intermediate frequency demodulation module and microwave receiver, it is characterized in that:
Described emitter also comprises the OFDM modulation module, described OFDM modulation module comprises that also module, inverse fast fourier transform module and first are also changeed the string module in the first string commentaries on classics that sets gradually, described first string changes and module receives the data flow of launching client, and data flow resolved into N road parallel sub-stream pairs, described inverse fast fourier transform module connects first and change the string module, described first and change the string module and links to each other with microwave transmitter by the intermediate frequency Modulation module; Described spread spectrum module is the wide-band spread spectrum module, comprise N parallel with one another the wide-band spread spectrum submodule that is arranged on the first string commentaries on classics and module and inverse fast fourier transform intermodule, be used for that N road parallel sub-stream pairs is carried out wide-band spread spectrum respectively and handle the parallel spread spectrum sub data flow in generation N road;
Described receiving system also comprises the OFDM demodulation module, described OFDM demodulation module comprises that also module, fast Fourier transform module and second are also changeed the string module in the second string commentaries on classics that sets gradually, described second string changes and module links to each other with microwave receiver by the intermediate frequency demodulation module, and the signal of receiving gone here and there and change after be sent to fast Fourier transform module, demodulate the parallel spread spectrum sub data flow in N road by fast Fourier transform module, described second also changes the string module is connected to the reception client; Described despreading module is a broadband despreading module, comprise being arranged on N parallel with one another the broadband despreading submodule that fast Fourier transform module and second is also changeed the string intermodule, be used for that the parallel spread spectrum sub data flow in N road is carried out broadband despreading processing respectively and be reduced into N road parallel sub-stream pairs.
2. a kind of spectrum-spread type PDH microwave communication system according to claim 1 is characterized in that, described wide-band spread spectrum module is a broadband pseudo-code spread spectrum module, and described wide-band spread spectrum submodule is a broadband pseudo-code spread spectrum submodule; Described broadband despreading module is a broadband pseudo-code despreading module, and described broadband despreading submodule is a broadband pseudo-code despreading submodule.
3. a kind of spectrum-spread type PDH microwave communication system according to claim 1, it is characterized in that, described emitter also comprises the coding spread spectrum coding module, described coding spread spectrum coding module be arranged at that first string that the data flow of emission client enters changes and module before, being used for that the data flow of emission client is carried out sending into first string after the encoding process changes and module; Described receiving system also comprises the coding spread spectrum decoder module, and described coding spread spectrum decoder module is arranged at second and change the string module and receive between the client, be used for second and the data flow of changeing the output of string module carry out delivering to the reception client again after the decoding processing.
4. a spectrum-spread type PDH microwave communication method is characterized in that, comprises the steps:
A, to the emission client data to be transmitted stream go here and there and conversion process resolve into N road parallel sub-stream pairs, respectively every way data flow being carried out wide-band spread spectrum again handles, the parallel spread spectrum sub data flow in the N road that forms carried out carrying out again after the orthogonal sub-carriers modulation through inverse fast fourier transform and go here and there conversion process generating baseband signal, with the emission of radio frequency signals that generates after baseband signal process intermediate frequency Modulation, the upconversion process in wireless channel;
B, receiving terminal to the radiofrequency signal that receives steps A and launch carry out down-conversion, the intermediate frequency demodulation treatment conversion is a baseband signal, also the parallel spread spectrum sub data flow in N road is isolated in conversion process, fast Fourier transform demodulation through string, then respectively every road spread spectrum sub data flow is carried out the broadband despreading and handle, process and string are converted to original serial data stream and return the reception client again.
5. the communication means of a kind of spectrum-spread type PDH microwave according to claim 4 is characterized in that, described wide-band spread spectrum is treated to broadband pseudo-code spread processing, and the despreading of described broadband is treated to broadband pseudo-code despreading and handles.
6. the communication means of a kind of spectrum-spread type PDH microwave according to claim 4 is characterized in that, the data flow in described steps A is through carrying out the coding spread spectrum encoding process earlier before string and the conversion; Correspondingly, the serial data stream after process among the described step B and the string conversion will carry out the coding spread spectrum decoding processing and obtains original data stream and return the reception client.
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| CN102158332A (en) * | 2011-04-25 | 2011-08-17 | 王文星 | Orthogonal frequency division multiplexing communication method and device for microgrid |
| CN103580719A (en) * | 2012-08-06 | 2014-02-12 | 上海航天测控通信研究所 | Full-digital intermediate-frequency despreading demodulation receiver |
| CN105610450B (en) * | 2016-03-08 | 2018-02-09 | 武汉大学 | A kind of broadband broadcast launching technique and system |
| CN113131966B (en) * | 2021-04-15 | 2022-09-16 | 上海金卓科技有限公司 | Data sending and receiving method and device for wireless communication |
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|---|---|---|---|---|
| US5548582A (en) * | 1993-12-22 | 1996-08-20 | U.S. Philips Corporation | Multicarrier frequency hopping communications system |
| CN1205142A (en) * | 1996-09-05 | 1999-01-13 | 诺基亚电信公司 | Transmitting and receiving method and radio system |
| CN1389036A (en) * | 2000-07-10 | 2003-01-01 | 松下电器产业株式会社 | Multi-carrier communication device and peak power suppression method |
| CN1549472A (en) * | 2003-05-07 | 2004-11-24 | 华为技术有限公司 | Modulation and demodulation device for orthogonal frequency division multiplexing system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5548582A (en) * | 1993-12-22 | 1996-08-20 | U.S. Philips Corporation | Multicarrier frequency hopping communications system |
| CN1205142A (en) * | 1996-09-05 | 1999-01-13 | 诺基亚电信公司 | Transmitting and receiving method and radio system |
| CN1389036A (en) * | 2000-07-10 | 2003-01-01 | 松下电器产业株式会社 | Multi-carrier communication device and peak power suppression method |
| CN1549472A (en) * | 2003-05-07 | 2004-11-24 | 华为技术有限公司 | Modulation and demodulation device for orthogonal frequency division multiplexing system |
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Effective date of registration: 20151119 Address after: Room 2605/2604 No. 1 Zhigongzhijia B 100045 Beijing city Xicheng District Fuxingmenwai Street Temple Road Patentee after: Beijing Top Link Telecommunication Co., Ltd. Patentee after: Wang Lei Address before: 100039, Beijing, Haidian District Fuxing Road, No. 38 Guardian apartment, room 1508 Patentee before: Beijing Top Link Telecommunication Co., Ltd. Patentee before: Chen Ping |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110420 Termination date: 20171020 |