CN102368689A - Multi-point data transmission system based on wireless spread spectrum communication - Google Patents
Multi-point data transmission system based on wireless spread spectrum communication Download PDFInfo
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Abstract
The invention discloses a multi-point data transmission system based on wireless spread spectrum communication. Both a transmitting terminal and a receiving terminal employ modular software and hardware designs, main signal processing work of the system is realized in a programmable logic device, a hardware structure is simplified, and system power consumption and volume are reduced. Simultaneously, the receiving terminal employs digital intermediate frequency reception technology to sample a signal at intermediate frequency, instant processing signal bandwidth in the digital intermediate frequency reception technology is substantially increased, a dynamic range is large, expandability is good, flexibility is high, simultaneously since a simulation link is reduced in a receiver, noise introduced from a front end is reduced, signal distortion is lessened, and a circuit is more concise. The receiving terminal employs a mode of carrying out parallel processing on received data, modularization of a software processing process is realized, and to different transmitting terminals, accurate reception can be realized only modifying a plurality of parameters. Simultaneously, a system capacity expanding method is simple, when quantity of the sending terminals is increased, and correspondingly increasing receiving terminal software modules is enough.
Description
Technical field
The present invention relates to a kind of multiple spot data transmission system based on radio spread spectrum communication, system mainly adopts the DSSS communication technology, and the private data that is used for carrying out simultaneously between a plurality of transmitting terminals and the receiving terminal is transmitted, and system is easy to expansion, flexible configuration.
Background technology
Existing spread spectrum data transmission system ubiquity hardware configuration is complicated; Defectives such as data transmission bauds is low; The conventional data transmission system receiving terminal generally adopts the mode of time-division communication when receiving the data of a plurality of transmitting terminals in addition; Can't receive the data of a plurality of transmitting terminals simultaneously, this has just greatly reduced the data transmission efficiency of system.
The present invention provides a kind of can carry out simultaneously that multiple spot high speed transmission data and antijamming capability are strong, the spread spectrum data transmission system of good confidentiality.
Summary of the invention
The objective of the invention is to, utilize the radio spread spectrum communication technology that a kind of system that can carry out the multiple spot high speed data transfer simultaneously is provided.The system data transmission rate is 20-80kbps, and the bandwidth of spread-spectrum signal is 5MHz, and IF spot is 70MHz, and the radio communication frequency is 400MHz.Spreading code length is 31 to 127, and simultaneity factor has adopted multiuser detection to disturb with the multiple access of removing system in baseband digital signal is handled.
The present invention adopts following technological means to realize:
A kind of multiple spot data transmission system based on radio spread spectrum communication; System contains programmable logic device, flash memory, software arrangements interface, supply module, data buffer, user data interface, Direct Digital Frequency Synthesizers, simulation up-converter circuit, band pass filter, low noise amplifier, analog down circuit, controllable gain amplifier, analog to digital converter, clock distributor, antenna, wherein:
1.1. programmable logic device is connected with user data interface, receives or the transmission user data, and does the work of Digital Signal Processing, programmable logic device is as the main controller controls peripheral circuit simultaneously;
1.2. flash memory, software arrangements interface, supply module and programmable logic device are formed the core data treatment system, the software arrangements interface is used for down load application program and configuration file, and flash memory is used for store configuration files; Data buffer is used as the spatial cache in the data handling procedure;
1.3. Direct Digital Frequency Synthesizers data after generation local carrier signal under the programmable logic device control is to spread spectrum are carried out BPSK (Binary Phase Shift Keying, two-phase PSK) modulation;
1.4. the multiple spot data connect up-conversion and the radiofrequency signal process of transmitting of realization to the transmitting terminal modulated signal through simulation up-converter circuit, band pass filter and low noise amplifier, antenna respectively successively; The multiple spot radiofrequency signal is transferred to receiving terminal through wireless channel respectively, and low noise amplifier, analog down circuit and band pass filter link to each other successively to achieve a butt joint and receive the analog down process of end multiple spot radiofrequency signal;
1.5. controllable gain amplifier combines with programmable logic device, accomplishes the automatic gain control to receiving terminal input analog intermediate frequency signal; Signal amplifying part is divided by the controllable gain amplifier realization, carries out amplitude by programmable logic device and detects and produce control word;
Receive the analog-to-digital conversion of end input analog intermediate frequency signal 1.6. analog to digital converter, clock distributor achieve a butt joint under the control of programmable logic device, revise sample frequency through programmable logic device configurable clock generator distributor;
Programmable logic device in aforesaid 1.1 is done different operating at transmitting terminal and receiving terminal branch: the programmable logic device of transmitting terminal need carry out the coding and the DSSS of user data, controls Direct Digital Frequency Synthesizers simultaneously; The programmable logic device of receiving terminal need carry out Digital Down Convert, sign indicating number despreading synchronously, remove signal processing operations such as interference, carrier synchronization demodulation, decoding, controls analog to digital converter, clock distributor and controllable gain amplifier simultaneously;
In aforesaid 1.3; Direct Digital Frequency Synthesizers realizes the analog-converted of digital signal with band pass filter and obtains the pure analog intermediate frequency signal of frequency; Utilize the simulation up-converter circuit that analog intermediate frequency signal is converted to high frequency analog signals afterwards; This signal through low noise amplifier, band pass filter, is finally gone out by antenna transmission successively;
In aforesaid 1.5, controllable gain amplifier is revised multiplication factor according to the control word that programmable logic device produces, and realizes automatic gain control function, and concrete implementation method is following:
Carry out level detection 4.1. give programmable logic device after analog intermediate frequency signal is sampled through analog to digital converter, programmable logic device calculates the testing result of the sampled signal point absolute value sum of setting quantity as the signal level amplitude continuously;
4.2. programmable logic device subtracts each other the level detection result with the expectation level value, obtain the difference between actual signal amplitude and the expectation amplitude, calculates the control word signal of current time to controllable gain amplifier according to this difference signal;
4.3. the multiplication factor of programmable logic device output control word modification of signal current time controllable gain amplifier.
A kind of multiple spot data transmission system based on radio spread spectrum communication of the present invention compared with prior art, has following remarkable advantages and beneficial effect:
Transmitting terminal and receiving terminal have all adopted the modularization design of hardware and software, and the signal processing work that system is main is placed in the programmable logic device and realizes, has simplified hardware configuration, has reduced system power dissipation and volume.Receiving terminal adopts the digital intermediate frequency reception technique at intermediate frequency signal to be sampled simultaneously; The instantaneous processed signal bandwidth of digital intermediate frequency reception technique increases greatly; Dynamic range is bigger, and extensibility is better, and flexibility is higher; Simultaneously owing to reduced the simulation link in the receiver, make noise that front end introduces still less, distorted signals is littler, circuit is more succinct.
Receiving terminal adopts parallel processing to receive the mode of data, and the realization of software processes procedure module only need be revised Several Parameters to different transmitting terminals and can realize accurate reception.The simultaneity factor expansion method is simple, and the corresponding receiving terminal software module that increases got final product when transmitting terminal quantity increased.
Description of drawings
Fig. 1 is a system of the present invention fundamental block diagram;
Fig. 2 (a) is transmitting terminal hardware module figure of the present invention;
Fig. 2 (b) is a transmitting terminal programmable logic device inner function module block diagram;
Fig. 3 (a) is receiving terminal hardware module figure of the present invention;
Fig. 3 (b) is a receiving terminal programmable logic device inner function module block diagram;
Fig. 4 is automatic gain control structure figure;
Fig. 5 is a system configuration schematic diagram of the present invention.
Wherein: 1 is programmable logic device; 2 is flash memory; 3 is the software arrangements interface; 4 is supply module; 5 is data buffer; 6 is user data interface; 7 is Direct Digital Frequency Synthesizers; 8 are the simulation up-converter circuit; 9 is band pass filter; 10 is low noise amplifier; 11 is the analog down circuit; 12 is controllable gain amplifier; 13 is analog to digital converter; 14 is clock distributor; 15 is antenna.
Embodiment
Below in conjunction with Figure of description embodiments of the invention are done further explanation:
System of the present invention fundamental block diagram is Fig. 1, and native system can be realized on the macroscopic view one to one and many-to-one spread spectrum radio transfer of data.User data up-conversion wireless transmission after transmitting terminal is accomplished direct sequence spread spectrum and BPSK (Binary Phase Shift Keying, two-phase PSK) modulation is gone out, and carries out recovering initial data after down-conversion and despreading synchronously and the synchronous demodulation at receiving terminal.When system during for transfer of data one to one, can adopt 31 spreading codes, this moment, the transmission speed of system was 80kbps; When system is the many-one transmission, adopt 127 spreading codes, this moment, system transmissions speed was 20kbps.
Fig. 2 a is depicted as transmitting terminal hardware module figure of the present invention, and the transmitting terminal software program is downloaded in the flash memory 2 by software arrangements interface 3, and the power on back programmable logic device 1 of starting working of transmitting terminal is written into program and configuration file from flash memory 2 and starts working.The task of the programmable logic device 1 of transmitting terminal is that user data is carried out source encoding, spread spectrum coding; Be configured through control pair Direct Digital Frequency Synthesizers 7, the local oscillator in the simulation up-converter circuit 8 is configured.The built-in function logic of programmable logic device 1 is shown in Fig. 2 b.Spread spectrum coding partly adopts DSSS, and 31 spreading codes are the m sequence, and 127 frequency expansion sequences are GOLD sign indicating number sequence (a kind of yard sequence of Robert S.Gold invention).Convert digital signal into analog signal through the digital signal behind the spread spectrum through Direct Digital Frequency Synthesizers 7; Deliver to simulation up-converter circuit 8 afterwards and upconvert to rf frequency 400MHz; And then 9 pairs of signals of process band pass filter carry out Filtering Processing; 10 pairs of radiofrequency signals of low noise amplifier are carried out corresponding power amplification, send through antenna 15 at last.
Fig. 3 a is receiving terminal hardware module figure of the present invention, the design of similar transmitting terminal, and the receiving terminal software program is also downloaded in the flash memory 2 by software arrangements interface 3, and the back programmable logic device 1 that powers on is written into program and configuration file from flash memory 2 starts working.The task of the programmable logic device 1 of receiving terminal is that the digital intermediate frequency signal that analog to digital converter 13 is exported is carried out Digital Down Convert, sign indicating number despreading synchronously, carrier synchronization demodulation, differential decoding; And carry out corresponding initialization and control operation through the local oscillator in control pair analog to digital converter 13, clock distributor 14, the analog down circuit 11, controllable gain amplifier 12.No matter system adopts one to one or the many-one structure; Front end simulation process part is all done same treatment; To be antenna 15 carry out giving low noise amplifier 10 after front-end filtering is handled with the radiofrequency signal that receives through band pass filter 9 does the simulation processing and amplifying, carries out analog down through analog down circuit 11 again radiofrequency signal is converted to 70MHz, and the controllable gain before giving controllable gain amplifier 12 then and sampling amplifies; The amplitude of analog intermediate frequency signal is amplified between scope [1,1].Delivering to analog to digital converter 13 through the analog intermediate frequency signal of controlled amplification samples; Introducing the bandwidth Sampling techniques here samples analog intermediate frequency signal and a down-converted with the 80MHz sample rate; The digital signal that obtains 10MHz is exported as sampling, and gives programmable logic device 1 with this digital signal via data buffer 5.The built-in function logic of programmable logic device 1 is shown in Fig. 3 b.It is 10MHz that Digital Down Converter Module receives sampling back digital signal, arrives 2.5MHz through Digital Down Convert.Digital filtering after the Digital Down Convert all is to carry out to this 2.5MHz baseband digital signal with operations such as sign indicating number despreading synchronously, carrier synchronization demodulation and differential decodings.
Shown in Figure 4 is automatic gain control structure figure, and this part purpose is with between the controlled amplitude range [1,1] that is amplified to analog to digital converter 13 defineds of analog if signal amplitude.Programmable logic device 1 carries out corresponding control operation through control pair controllable gain amplifier 12, and wherein control line comprises 1 power consumption mode control line and 5 gain controlling lines.When the power consumption mode control line be 0.8V when following controllable gain amplifier 12 be operated in low-power consumption mode.Article 5, the gain controlling line is used for transmitting the control word signal that programmable logic device 1 produces, altogether corresponding 25 kinds of multiplication factors.The process that control word produces is considered signal gets too small or interruption situation possibly occur in the actual conditions, amplifies in any case this moment and all can not fall in the desired range of values, and this can cause overflowing of loop filter, does not have the effect of automatic gain control.Therefore add an identification module in the programming,, simultaneously multiplication factor is made as maximum when continuous a plurality of signal amplitudes can be made as ' 1 ' with id signal sign when setting minimum value; If during signal amplitude greater than this thresholding, then id signal sign is made as ' 0 ', and carries out controlled amplification.
Shown in Figure 5 is system configuration schematic diagram of the present invention, sends the structure of receiving terminal parallel receive here simultaneously with n transmitting terminal.Each user sends the transmission data of oneself to programmable logic device 1 through user data interface 6 respectively, accomplishes differential coding, direct sequence spread spectrum to user data herein.The spread spectrum process is selected the spreading code of distributing respectively for use, can select 31 m sequences or 127 GOLD sign indicating number sequences to number of users and transmission speed here.Signal behind the spread spectrum is accomplished the BPSK modulation under the control of programmable logic device 1, obtain analog intermediate frequency signal.Analog intermediate frequency signal sends through antenna 15 through simulation up-conversion, filtering, power amplification operation back.The receiving terminal analog part is finished dealing with and is given analog to digital converter 13 after power amplification, analog down and filtering and the controllable gain processing and amplifying and sample; Obtain the 10MHz digital signal after the sampling; This digital signal delivered to carry out Digital Down Convert in the programmable logic device 1 and handle the baseband digital signal obtain 2.5MHz; Adopt the different user spreading code to carry out sign indicating number despreading synchronously respectively to this baseband digital signal; Remove each other simultaneously and disturb, carry out the carrier synchronization demodulation afterwards, carry out differential decoding at last and obtain each user data.The said process parallel processing is carried out synchronously, receives when realizing the multichannel user data.
Claims (4)
1. multiple spot data transmission system based on radio spread spectrum communication; System contains programmable logic device (1), flash memory (2), software arrangements interface (3), supply module (4), data buffer (5), user data interface (6), Direct Digital Frequency Synthesizers (7), simulation up-converter circuit (8), band pass filter (9), low noise amplifier (10), analog down circuit (11), controllable gain amplifier (12), analog to digital converter (13), clock distributor (14), antenna (15), it is characterized in that:
1.1. programmable logic device (1) is connected with user data interface (6), receives or the transmission user data, and does the work of Digital Signal Processing, programmable logic device (1) is as the main controller controls peripheral circuit simultaneously;
1.2. flash memory (2), software arrangements interface (3), supply module (4) and programmable logic device (1) are formed the core data treatment system, software arrangements interface (3) is used for down load application program and configuration file, and flash memory (2) is used for store configuration files; Data buffer (4) is used as the spatial cache in the data handling procedure;
1.3. Direct Digital Frequency Synthesizers (7) data after generation local carrier signal under programmable logic device (1) control is to spread spectrum are carried out BPSK (Binary Phase Shift Keying, two-phase PSK) modulation;
1.4. the multiple spot data connect up-conversion and the radiofrequency signal process of transmitting of realizing the transmitting terminal modulated signal through simulation up-converter circuit (8), band pass filter (9) and low noise amplifier (10), antenna (15) respectively successively; Multiple spot superimposed RF signal is transferred to receiving terminal through wireless channel respectively, and low noise amplifier (10), analog down circuit (11) and band pass filter (9) link to each other successively to achieve a butt joint and receive the analog down process of end multiple spot radiofrequency signal;
1.5. controllable gain amplifier (12) combines with programmable logic device (1), accomplishes the automatic gain control to receiving terminal input analog intermediate frequency signal; Signal amplifying part is divided by controllable gain amplifier (12) realization, carries out amplitude by programmable logic device (1) and detects and produce control word;
Receive the analog-to-digital conversion of end input analog intermediate frequency signal 1.6. analog to digital converter (13), clock distributor (14) achieve a butt joint under the control of programmable logic device (1), revise sample frequency through programmable logic device (1) configurable clock generator distributor (14).
2. according to a kind of multiple spot data transmission system described in the claim 1 based on radio spread spectrum communication; It is characterized in that: the programmable logic device in described 1.1 (1) is done different operating at transmitting terminal and receiving terminal branch: the programmable logic device of transmitting terminal (1) need carry out the coding and the DSSS of user data, controls Direct Digital Frequency Synthesizers (7) simultaneously; The programmable logic device of receiving terminal (1) need carry out Digital Down Convert, sign indicating number despreading synchronously, remove signal processing operations such as interference, carrier synchronization demodulation, decoding, controls analog to digital converter (13), clock distributor (14) and controllable gain amplifier (13) simultaneously.
3. according to a kind of multiple spot data transmission system described in the claim 1 based on radio spread spectrum communication; It is characterized in that: in described 1.3; Direct Digital Frequency Synthesizers (7) realizes the analog-converted of digital signal with band pass filter (9) and obtains the pure analog intermediate frequency signal of frequency; Utilize simulation up-converter circuit (8) that analog intermediate frequency signal is converted to high frequency analog signals afterwards; This signal through low noise amplifier (10), band pass filter (9), is finally sent by antenna (15) successively.
4. according to a kind of multiple spot data transmission system described in the claim 1 based on radio spread spectrum communication; It is characterized in that: in described 1.5; Controllable gain amplifier (12) is revised multiplication factor according to the control word that programmable logic device (1) produces; Realize automatic gain control function, concrete implementation method is following;
Carry out level detection 4.1. give programmable logic device (1) after analog intermediate frequency signal is sampled through analog to digital converter (13), programmable logic device (1) calculates the testing result of the sampled signal point absolute value sum of setting quantity as the signal level amplitude continuously;
4.2. programmable logic device (1) subtracts each other the level detection result with the expectation level value, obtain the difference between actual signal amplitude and the expectation amplitude, calculates the control word signal of current time to controllable gain amplifier (13) according to this difference signal;
4.3. the multiplication factor of programmable logic device (1) output control word modification of signal current time controllable gain amplifier (13).
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| CN104917556A (en) * | 2015-04-16 | 2015-09-16 | 北京理工大学 | Synchronous multi-beam signal generation method based on ultrahigh-speed DAC |
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| CN109661778B (en) * | 2016-08-10 | 2023-05-16 | 思睿逻辑国际半导体有限公司 | Multipath digitization based on input signal fidelity and output requirements |
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| CN111123814B (en) * | 2018-10-31 | 2021-08-17 | 北京瑞航同达科技有限公司 | Programmable encoder for pulse code modulation frame structure |
| CN109245828A (en) * | 2018-11-22 | 2019-01-18 | 中国工程物理研究院电子工程研究所 | A kind of Terahertz wireless transceiver system for blackout range telemetry communication |
| CN112217520A (en) * | 2020-09-30 | 2021-01-12 | 广州市埃特斯通讯设备有限公司 | Method and system for decoding FM0 coded data of ETC |
| CN112217520B (en) * | 2020-09-30 | 2023-11-14 | 广州市埃特斯通讯设备有限公司 | Method and system for decoding FM0 encoded data of ETC |
| CN117291134A (en) * | 2023-11-07 | 2023-12-26 | 成都天贸科技有限公司 | Design for loading digital modulation into signal source |
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