CN103067330B - Communication method for dynamic reconfigurable under water acoustics modulator-demodulator - Google Patents
Communication method for dynamic reconfigurable under water acoustics modulator-demodulator Download PDFInfo
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- CN103067330B CN103067330B CN201210544678.7A CN201210544678A CN103067330B CN 103067330 B CN103067330 B CN 103067330B CN 201210544678 A CN201210544678 A CN 201210544678A CN 103067330 B CN103067330 B CN 103067330B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a dynamic reconfigurable under water acoustics modulator-demodulator and a communication method of the dynamic reconfigurable under water acoustics modulator-demodulator. Before communication, the dynamic reconfigurable under water acoustics modulator-demodulator tests an under water acoustics information channel, and determines the data transfer rate and an optimum modulation-demodulation manner of communication according to testing results. Compared with a modulator-demodulator designed in the worst information channel condition, use ratio of frequency band resources is increased, and thus energy consumption is lowered. An out-chip memory is adopted in the dynamic reconfigurable under water acoustics modulator-demodulator, after the determination of the optimum modulation-demodulation manner which is suitable for current information channel according to the information channel testing results through a information channel testing module, a data flow file of a corresponding modulation-demodulation manner is uploaded from the out-chip memory, and a modulation module and a demodulation module are dynamically reconfigured, thus the under water acoustics modulator-demodulator is enabled to switch over different modulation-demodulation manners freely according to real-time information channel conditions, and all of the modulation-demodulation manners need not to be realized on a field programmable gata array (FPGA), and thus hardware resources of a digital signal processing module is reduced.
Description
Technical field
The present invention relates to underwater sound modem technology, be specifically related to a kind of dynamic reconfigurable underwater sound modulator-demodulator and communication means thereof.
Background technology
The area of the earth about 70% cover by ocean, the resources such as abundant mineral products, biology, the energy are contained in ocean, and along with the mankind's continually developing and utilization land resources, ocean becomes the mankind and survives and the important base of social sustainable development.But due to the restriction of objective condition, the ocean of more than 95% is also in untapped or initial development status.At present, countries in the world to the rights and interests pay attention to day by day of its ocean, develop have low cost, high reliability, real time communication underwater wireless sensor network become a new study hotspot.
Underwater wireless sensor network realizes the launching and receiving of data by the communication between the sensor node be distributed in three-dimensional underwater environment, because electromagnetic wave is decayed seriously in the seawater, and lightwave communication requires higher to the clarity of seawater, and need adjusting to a line technology, by acoustic communication between current underwater wireless sensor network node, the design and implimentation of underwater sound sensor node and underwater sound modulator-demodulator becomes the key setting up underwater wireless sensor network.
Realize the underwater wireless sensor network of the launching and receiving of signal using underwater sound modulator-demodulator as node, comprise tens, up to a hundred underwater sound modulator-demodulators.Because the position of each underwater sound modulator-demodulator is different with the degree of depth, and ocean terrain environment is complicated and changeable, the channel of different send-receive communication links is very different, or even same send-receive communication link is due to the relative motion between two modulator-demodulators, underwater sound channel is also change.Based on the underwater sound modulator-demodulator of most difference channel situation design, communicate under being operated in the data transmission rate lower than the data transmission rate of actual conditions permission, lower data transmission rate not only wastes rare band resource under water, and lower data transmission rate means longer symbol duration, thus cause energy consumption when transmitting identical data information to strengthen, and underwater sound modulator-demodulator is battery powered, the communication of low energy consumption is vital for the life-span extending underwater wireless sensor network.
The time-varying characteristics of underwater sound channel are noticed during the design of some underwater sound modulator-demodulators, propose the modulator-demodulator with more modulation demodulation mode, as the Micromodem of WHOI research institute of U.S. design, Micromodem supports frequency shift keying (Frequency-shift keying) FSK and phase shift keying (phase-shift keying) PSK two kinds of modulation systems, wherein FSK is used for the application of the low data transmission rate of shallow water, and PSK is mainly used in the application of deep water and high data transmission rate, but these underwater sound modulator-demodulators already set messaging parameter before being deployed to marine environment, its modulation demodulation system and data transmission rate can not be regulated according to real-time underwater sound channel situation.
In addition, when realizing that there is the modulator-demodulator of more modulation demodulation mode based on conventional hardware method for designing, need all modulation demodulation systems to realize on hardware device simultaneously, but in particular channel situation sometime, only have best modulation demodulation system in running order, and other modulation demodulation systems are unwanted, more modulation demodulation mode is consumed hardware resource more more than actual needs in hard-wired method simultaneously.
Summary of the invention
The problem that the error rate is high, energy consumption is large communicated between each node of the underwater wireless sensor network caused for the time-varying characteristics solving above-mentioned underwater sound channel, the invention provides a kind of dynamic reconfigurable underwater sound modulator-demodulator and communication means thereof, on the one hand determine the best modulation demodulation system that communicates between two acoustic modems and data transmission rate thereof according to real-time channel detection result, underwater sound modulation /demodulation have employed the implementation of dynamic reconfigurable on the other hand, reduces the resource consumption that modem hardware realizes.
One object of the present invention is to provide a kind of dynamic reconfigurable underwater sound modulator-demodulator.
Underwater sound modulator-demodulator of the present invention comprises: transducer, underwater acoustic transducer, analog front circuit, analog to digital converter, digital to analog converter and digital signal processing module; Analog front circuit comprises receiving circuit and radiating circuit; Digital signal processing module comprises processor, channel detection module, bit synchronization module, demodulation module and modulation module further; Wherein, the acoustic energy signal received is converted to analog electrical signal by underwater acoustic transducer, is sent to receiving circuit; Receiving circuit is connected to analog to digital converter, analog electrical signal is converted to digital data transmission to channel detection module or by bit synchronization module transfer to demodulation module; Channel detection module, demodulation module are connected with processor respectively with modulation module; Transducer by the underwater signal transmission that receives to processor; Processor transmits signals to modulation module; Signal after modulation is sent to digital to analog converter by modulation module; Digital to analog converter converts digital signal to analog electrical signal and transfers to radiating circuit; Analog electrical signal is transferred to underwater acoustic transducer by radiating circuit, converts acoustical signal to and launches.
Digital signal processing module of the present invention realizes based on field programmable gate array (Field-Programmable Gate Array) FPGA device.FPGA is divided into static part and dynamic reconfigurable part, and wherein, static part comprises processor, channel detection module and synchronization module, and dynamic reconfigurable part comprises demodulation module and modulation module.The present invention adopts FPGA device, is the device of semi-custom circuit, has both solved the deficiency of custom circuit, overcomes again the shortcoming that original programming device gate circuit number is limited, reduces power consumption simultaneously.
Using the underwater wireless sensor network that underwater sound modulator-demodulator of the present invention is formed as node, communicate between two underwater sound modulator-demodulators, respectively as transmitting node and receiving node, the signal that its transducer receives is emitted to receiving node by transmitting node, and detailed process is as follows: transmitting node launches Channel Detection signal to receiving node; The underwater acoustic transducer of receiving node receives this signal, transfers to channel detection module through receiving circuit and analog to digital converter; Channel detection module carries out Channel Detection, obtains channel parameter, transfers to processor; Processor determines the data transmission rate of carrying out communicating and modulation demodulation system between the two according to the situation of channel, then sends modulation module to; Through digital to analog converter and radiating circuit, send it back transmitting node by underwater acoustic transducer; Transmitting node receives signal, transmits to receiving node according to established data transfer rate and modulation demodulation system.Thus underwater sound modulator-demodulator of the present invention, can determine the best modulation demodulation system that communicates between two acoustic modems and data transmission rate thereof, improve resource utilization, thus reduce energy consumption according to real-time channel detection result.
Because underwater sound channel has time-varying characteristics, according to the situation of channel, underwater sound modulator-demodulator is operated in provide different data transmission rates under different modulation demodulation systems, and different channel situation needs multiple different modulation demodulation system; And in particular channel situation sometime, only have best modulation demodulation system in running order, and other modulation demodulation systems are unwanted, if by more modulation demodulation mode simultaneously at hardware implementing, then consume hardware resource more more than actual needs.Therefore, the present invention comprises the chip external memory be connected with FPGA further, and more modulation demodulation mode is stored in chip external memory with the form of the data streaming file that FPGA can identify.More modulation demodulation mode comprises frequency shift keying (Frequency-shift keying) FSK, phase shift keying (phase-shift keying) PSK, direct sequence spread spectrum (Direct Sequence Spread Spectrum) DSSS and OFDM (Orthogonal Frequency Division Multiplexing) OFDM, and each modulation demodulation system is corresponding with certain data transmission rate.After processor determines the best modulation demodulation system of applicable present channel according to the channel detection result of channel detection module, the data streaming file of corresponding modulation demodulation system is loaded from chip external memory, dynamic reconfigurable configuration is carried out to modulation module and demodulation module, can realize with the communication of this modulation demodulation system.Therefore, the present invention adopts dynamic reconfigurable to configure, underwater sound modulator-demodulator can be made according to real-time channel situation, adopt best modulation demodulation system, switch freely between different modulation demodulation systems, and modulation demodulation system that will be not all realizes on FPGA simultaneously, thus decrease the hard-wired resource of digital signal processing module.
Demodulation module under different modulation demodulation system of the present invention and modulation module have identical interface.
Another object of the present invention is the communication means providing a kind of dynamic reconfigurable underwater sound modulator-demodulator.
Using the underwater wireless sensor network that above-mentioned underwater sound modulator-demodulator is formed as node, communicate between two underwater sound modulator-demodulators, respectively as transmitting node and receiving node, the communication means of underwater sound modulator-demodulator comprises the following steps:
1) transmitting node launches Channel Detection signal to receiving node;
2) underwater acoustic transducer of receiving node receives this signal, transfers to channel detection module through receiving circuit and analog to digital converter, and channel detection module carries out Channel Detection, obtains channel parameter, transfers to processor;
3) processor of receiving node determines the data transmission rate of carrying out communicating and modulation demodulation system between the two according to the situation of channel, and complete the dynamic reconfigurable configuration of modulation module and demodulation module, then the data transmission rate of communication and modulation demodulation system is sent to modulation module, through digital to analog converter and radiating circuit, send it back transmitting node by underwater acoustic transducer, complete the dynamic reconfigurable configuration to modulation module and demodulation module afterwards;
4) the underwater acoustic transducer Received signal strength of transmitting node, through receiving circuit and analog to digital converter, by bit synchronization module and demodulation module, processor receives data transmission rate and the modulation demodulation system of communication, completes the dynamic reconfigurable configuration to modulation module and demodulation module;
5) transmitting node signal to be transmitted that transducer is collected, according to established data transfer rate and modulation demodulation system, after being modulated by modulation module, through digital to analog converter, radiating circuit and underwater acoustic transducer, be emitted to receiving node, communicate with receiving node.
Wherein, step 3) and 4) in, after processor determines the best modulation demodulation system of applicable present channel according to the channel detection result of channel detection module, from the chip external memory be connected with FPGA, load the data streaming file of corresponding modulation demodulation system, dynamic reconfigurable configuration is carried out to modulation module and demodulation module.
Advantage of the present invention:
The dynamic reconfigurable underwater sound modulator-demodulator that the present invention proposes, before a communication, underwater sound channel is detected, the modulation demodulation system of data transmission rate and the best communicated is determined according to the result of Channel Detection, compared with the modulator-demodulator designed with most difference channel situation, improve the utilance of band resource, thus reduce energy consumption; The present invention adopts dynamic reconfigurable to configure, underwater sound modulator-demodulator can be made according to real-time channel situation, adopt best modulation demodulation system, switch freely between different modulation demodulation systems, and modulation demodulation system that will be not all realizes on FPGA simultaneously, decrease the hard-wired resource of digital signal processing module.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of a kind of dynamic reconfigurable underwater sound modulator-demodulator of the present invention;
Fig. 2 is the flow chart of an embodiment of carrying out communicating between two dynamic reconfigurable underwater sound modulator-demodulators of the present invention.
Embodiment
Below in conjunction with accompanying drawing, further describe the present invention by embodiment.
As shown in Figure 1, the underwater sound modulator-demodulator of the present embodiment comprises: transducer 0, underwater acoustic transducer 1, analog front circuit, analog to digital converter 4, digital to analog converter 5 and digital signal processing module; Analog front circuit comprises receiving circuit 2 and radiating circuit 3; Digital signal processing module comprises processor 8, channel detection module 7, bit synchronization module 6, demodulation module 11 and modulation module 10 further; Wherein, the acoustic energy signal received is converted to the signal of telecommunication by underwater acoustic transducer 1, is sent to receiving circuit 2; Receiving circuit 2 is connected to analog to digital converter 4, converts the electrical signal to digital data transmission and transfers to demodulation module 11 to channel detection module 7 or by bit synchronization module 6; Channel detection module 7, demodulation module 11 are connected with processor 8 respectively with modulation module 10; Transducer 0 by the underwater signal transmission that receives to processor 8; Processor 8 transmits signals to modulation module 10; Signal after modulation is sent to digital to analog converter 5 by modulation module 10; Digital signal is converted to electric signal transmission to radiating circuit 3 by digital to analog converter 5; Electric signal transmission to underwater acoustic transducer 1, is converted to acoustical signal and launches by radiating circuit 3.
Underwater sound modulator-demodulator of the present invention is as the node of underwater wireless sensor network, and transmitting and receiving signal, is in emission mode when transmitting, is in receiving mode during Received signal strength.Transducer 1 can be made up of piezoceramic material, realize conversion and the inverse transform of the signal of telecommunication and acoustic signals, when receiving mode, the acoustic signals received is converted to analog electrical signal by underwater acoustic transducer 1, and when emission mode, analog signal is converted to acoustic signals and sends by underwater acoustic transducer 1; Analog front circuit comprises receiving circuit 2 and radiating circuit 3, and receiving circuit 2 is when acoustic modem is in receiving mode under water, and the signal of telecommunication changed by transducer 1 carries out filtering and amplification; Signal when acoustic modem is in emission mode under water, is carried out power amplification by radiating circuit 3; Analog to digital converter 4, when receiving mode, realizes the conversion of analog signal to digital signal; And digital to analog converter 5 realizes the conversion of digital signal to analog signal when emission mode; Digital signal processing module realizes the modulation and demodulation of signal, and realize based on FPGA device, comprise bit synchronization module 6, channel detection module 7, processor 8, modulation module 10 and demodulation module 11, modulation module 10 and demodulation module 11 form modulation /demodulation module 9.
The work of underwater sound modulator-demodulator in a half-duplex mode, when emission mode, information to be sent is sent to modulation module 10 by processor 8, digital signal after modulation is after digital to analog converter 5, outputting analog signal, analog signal is converted to acoustic signals through underwater acoustic transducer 1 after amplifying in radiating circuit 3 and sends; When receiving mode, the acoustic signals received is converted to analog electrical signal by underwater acoustic transducer 1, in receiving circuit 2 after amplification filtering, analog signal is converted into digital signal in analog to digital converter 4, after bit synchronization module 6 completion bit is synchronous, the demodulation result of the output of demodulation module 11 sends to processor 8.
Under underwater sound modulator-demodulator may be operated in different modulation demodulation systems according to channel situation, to provide different data transmission rates, but under particular channel, a kind of modulation demodulation system of the best is only had to communicate, therefore modulation module and demodulation module 9 are defined as dynamic reconfigurable module, after the hardware designs completing often kind of modulation demodulation system, by often kind of possible modulation demodulation system, as FSK, PSK, DSSS and OFDM, with the data streaming file that FPGA can identify, as .bit file is stored in the chip external memory 12 be connected with FPGA, after processor 8 determines the best modulation demodulation system of applicable present channel according to the channel detection result of channel detection module 7, corresponding data streaming file is loaded as FSK.bit from chip external memory 12, mode transfer block 9 is conciliate to modulation and carries out dynamic reconfigurable configuration, can realize afterwards with the communication of this modulation demodulation system.
As shown in Figure 2, using the underwater wireless sensor network that the underwater sound modulator-demodulator of the present embodiment is formed as node, communicate between two underwater sound modulator-demodulators, respectively as transmitting node and receiving node, the communication means of underwater sound modulator-demodulator comprises the following steps:
1) transmitting node launches Channel Detection signal to receiving node, specifically can send linear FM signal;
2) underwater acoustic transducer of receiving node receives this signal, transfer to channel detection module through receiving circuit and analog to digital converter, channel detection module carries out Channel Detection, obtains channel parameter, transfer to processor, channel parameter comprises Doppler frequency shift, Multipath Transmission time delay and signal to noise ratio;
3) processor of receiving node determines the data transmission rate of carrying out communicating and modulation demodulation system between the two according to the situation of channel, such as FSK can carry out the communication that data transmission rate is 200, PSK can carry out the communication that data transmission rate is 1000, then the data transmission rate of communication and modulation demodulation system is sent to modulation module, through digital to analog converter and radiating circuit, transmitting node is sent it back by underwater acoustic transducer, from chip external memory 12, load corresponding data streaming file afterwards, complete the dynamic reconfigurable configuration of modulation module and demodulation module;
4) the underwater acoustic transducer Received signal strength of transmitting node, through receiving circuit and analog to digital converter, by bit synchronization module and demodulation module, processor receives data transmission rate and the modulation demodulation system of communication, from chip external memory 12, load corresponding data streaming file, complete the dynamic reconfigurable configuration of modulation module and demodulation module;
5) transmitting node signal to be transmitted that transducer is collected, according to established data transfer rate and modulation demodulation system, after being modulated by modulation module, through digital to analog converter, radiating circuit and underwater acoustic transducer, be emitted to receiving node, communicate with receiving node.
Last it is noted that although this specification describes design parameter of the present invention and structure in detail by specific embodiment; but it should be appreciated by those skilled in the art; implementation of the present invention is not limited to the description scope of embodiment; not departing from essence of the present invention and scope; can carry out various amendment and replacement to the present invention, therefore protection scope of the present invention defined depending on right.
Claims (3)
1. the communication means of a underwater sound modulator-demodulator, it is characterized in that, the underwater wireless sensor network formed using underwater sound modulator-demodulator as node, communicate between two underwater sound modulator-demodulators, respectively as transmitting node and receiving node, described communication means comprises the following steps:
1) transmitting node launches Channel Detection signal to receiving node;
2) underwater acoustic transducer of receiving node receives this signal, transfers to channel detection module through receiving circuit and analog to digital converter, and channel detection module carries out Channel Detection, obtains channel parameter, transfers to processor;
3) processor of receiving node determines the data transmission rate of carrying out communicating and modulation demodulation system between the two according to the situation of channel, then the data transmission rate of communication and modulation demodulation system is sent to modulation module, through digital to analog converter and radiating circuit, send it back transmitting node by underwater acoustic transducer, complete the dynamic reconfigurable configuration of modulation module and demodulation module afterwards;
4) the underwater acoustic transducer Received signal strength of transmitting node, through receiving circuit and analog to digital converter, by bit synchronization module and demodulation module, processor receives data transmission rate and the modulation demodulation system of communication, completes the dynamic reconfigurable configuration of modulation module and demodulation module;
5) transmitting node signal to be transmitted that transducer is collected, according to established data transfer rate and modulation demodulation system, after being modulated by modulation module, through digital to analog converter, radiating circuit and underwater acoustic transducer, be emitted to receiving node, communicate with receiving node.
2. communication means as claimed in claim 1, it is characterized in that, in step 3) and 4) in, after processor determines the best modulation demodulation system of applicable present channel according to the channel detection result of channel detection module, from the chip external memory be connected with FPGA, load the data streaming file of corresponding modulation demodulation system, dynamic reconfigurable configuration is carried out to modulation module and demodulation module.
3. communication means as claimed in claim 1, is characterized in that, in step 2) in, described channel parameter comprises Doppler frequency shift, Multipath Transmission time delay and signal to noise ratio.
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| CN103840893B (en) * | 2013-07-29 | 2015-09-30 | 哈尔滨工程大学 | Ping reconstructing method under a kind of underwater sound multi_path channel |
| CN104615909B (en) * | 2015-02-02 | 2018-02-13 | 天津大学 | Izhikevich neuroid synchronous discharge emulation platforms based on FPGA |
| CN104618303B (en) * | 2015-02-05 | 2017-11-03 | 东南大学 | A kind of restructural modulation-demo-demodulation method being applied in Base-Band Processing |
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| CN105827270B (en) * | 2016-03-10 | 2019-01-01 | 北京大学 | Underwater communication device towards Shui Zhong robot |
| CN106487395A (en) * | 2016-10-18 | 2017-03-08 | 哈尔滨工业大学 | Multi-mode demodulating system based on FPGA |
| CN108206704A (en) * | 2016-12-20 | 2018-06-26 | 天津大学（青岛）海洋工程研究院有限公司 | A kind of underwater acoustic communication of dynamic reconfigurable receives system |
| DE102017109625A1 (en) * | 2017-05-04 | 2018-11-08 | Atlas Elektronik Gmbh | HYDROPHONE UNIT FOR SUBMITTING HYDROPHONIC SIGNALS AND PROCESSING UNIT TO THEIR RECEPTION AND SONAR PLANT THEREWITH, AND METHOD THEREFOR |
| EP3639530B1 (en) | 2017-06-15 | 2022-03-02 | Telefonaktiebolaget LM Ericsson (PUBL) | Hardware platform based on fpga partial reconfiguration for wireless communication device |
| CN107645311A (en) * | 2017-09-26 | 2018-01-30 | 天津光电通信技术有限公司 | One kind is with underwater sound sensing multi-node system |
| CN107508645B (en) * | 2017-09-30 | 2020-11-06 | 深圳市智慧海洋科技有限公司 | Underwater acoustic sensor network simulation test method and platform thereof |
| CN108337002A (en) * | 2018-02-09 | 2018-07-27 | 黄淮学院 | A kind of multiple channel acousto signal reconfiguring method |
| CN110850773B (en) * | 2019-11-14 | 2021-01-22 | 北京和利时系统工程有限公司 | Signal acquisition method and device, computer storage medium and electronic equipment |
| CN111224749B (en) * | 2020-01-08 | 2022-08-09 | 重庆邮电大学 | Method and system for diversity combining transmission of signals in heterogeneous transmission medium |
| CN112929096B (en) * | 2021-01-27 | 2022-07-12 | 嘉兴中科声学科技有限公司 | Sound signal processing method and device and electronic equipment |
| CN113992487B (en) * | 2021-09-18 | 2022-10-28 | 电子科技大学 | Configurable analog demodulation method based on SOC |
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