CN106998219B - The multicarrier More Secure Underwater Acoustic Frequency-Hopping Communication of m combination selector modulation is selected based on N - Google Patents
The multicarrier More Secure Underwater Acoustic Frequency-Hopping Communication of m combination selector modulation is selected based on N Download PDFInfo
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- CN106998219B CN106998219B CN201710326440.XA CN201710326440A CN106998219B CN 106998219 B CN106998219 B CN 106998219B CN 201710326440 A CN201710326440 A CN 201710326440A CN 106998219 B CN106998219 B CN 106998219B
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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
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
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Abstract
The multicarrier More Secure Underwater Acoustic Frequency-Hopping Communication that m combination selector modulation is selected based on N, is related to underwater sound communication.Including transmitting terminal and receiving end, transmitting terminal includes coding unit, is based onMulti-carrier modulation unit, frequency hopping modulation unit and the underwater acoustic transducer transmitting unit of combination selection modulator；Receiving end includes underwater acoustic transducer receiving unit, frequency hopping demodulating unit, is based onThe multicarrier demodulating unit and decoding unit of combination selection demodulator；Coding unit input terminal connects information source, and coding unit output end is connected with multi-carrier modulation unit input terminal, and multi-carrier modulation unit output end is connected with frequency hopping modulation unit input terminal, and frequency hopping modulation unit output end is connected with underwater acoustic transducer transmitting unit；Underwater acoustic transducer receiving unit output end is connected with frequency hopping demodulating unit input terminal, and frequency hopping demodulating unit output end is connected with multicarrier demodulating unit input terminal, and multicarrier demodulating unit output end is connected with decoding unit input terminal, and decoding unit exports the stay of two nights.
Description
Technical field
The present invention relates to underwater sound communications, select the multicarrier underwater sound frequency hopping of m combination selector modulation logical more particularly, to based on N
Letter system.
Background technique
Frequency hopping (FH:Frequency Hopping) communication technology with its Robust Performance, strong antijamming capability, good confidentiality,
The features such as being easily achieved multiple access networking is widely used in various underwater sound communication systems.But because needing constantly to switch in its realization
Frequency, it is difficult to the consistency of phase is kept, so incoherent multifrequency frequency shift keying (MFSK:M-ary Frequency is widely used
Shift Keying) technology realizes that Fig. 1 show FH-MFSK More Secure Underwater Acoustic Frequency-Hopping Communication block diagram.The maximum of MFSK modulation technique
Disadvantage is exactly that band efficiency is low, in the underwater sound communication of limited available bandwidth, seriously constrains More Secure Underwater Acoustic Frequency-Hopping Communication
Message transmission rate.The defect that how to overcome its band efficiency low on the basis of keeping frequency hopping advantage as a result, improves
Message transmission rate is always an important directions of technical field of underwater acoustic communication research.
Replacing MFSK modulation technique using multi-carrier modulation technology is one of the hot spot of research.The multicarrier tune reported at present
It is formed with the frequency-hopping communication system based on binary switch keying (OOK:On-Off Keying) modulation and is based on OFDM modulation technique
Frequency-hopping communication system, both multi-carrier modulations can be greatly improved frequency hopping underwater sound communication system data transmission speed
Rate, but all there is the modulation uncertain problem of number of carrier wave.And in noncoherent detection, judgement foundation is signalc threshold amplitude,
It is that may be present compared with high multipath-interference, court verdict in signal in the case where can not determining that modulation carrier wave is several in signal
It is uncertain increase, improve the bit error rate.
Summary of the invention
The technical problem to be solved by the invention is to provide the bases of fixed carrier number that is can be improved the availability of frequency spectrum
The multicarrier More Secure Underwater Acoustic Frequency-Hopping Communication of m combination selector modulation is selected in N.
The present invention includes transmitting terminal and receiving end, and the transmitting terminal includes coding unit, is based onCombination selection modulator
Multi-carrier modulation unit, frequency hopping modulation unit and underwater acoustic transducer transmitting unit；The receiving end includes that underwater acoustic transducer connects
It receives unit, frequency hopping demodulating unit, be based onThe multicarrier demodulating unit and decoding unit of combination selection demodulator；
The input terminal of the coding unit connects information source, the output end of coding unit and the input terminal of multi-carrier modulation unit
It is connected, multi-carrier modulation unit output end is connected with the input terminal of frequency hopping modulation unit, the output end and water of frequency hopping modulation unit
Sonic transducer transmitting unit is connected；
The output end of the underwater acoustic transducer receiving unit is connected with the input terminal of frequency hopping demodulating unit, frequency hopping demodulating unit
Output end be connected with the input terminal of multicarrier demodulating unit, the output end of multicarrier demodulating unit and the input terminal of decoding unit
It is connected, decoding unit exports the stay of two nights.
The multi-carrier modulation unit include serioparallel exchange module (it is parallel serially to turn the road k),Combination selection modulator, m
A carrier wave synthesis module；The input terminal of the input terminal connection multi-carrier modulation unit of the serioparallel exchange module, serioparallel exchange mould
The road the k output that block is realized is connected toCombination selection modulator；In the modulator, the 2 of the road k input compositionkKind assembled state point
It does not correspond to2 in combinationkA m carrier combination stateAnd it is different and mutual by m frequency of modulator output
Orthogonal carrier wave；M carrier wave is input to carrier wave synthesis module, the output end connection multi-carrier modulation unit of carrier wave synthesis module
Output end.
The multicarrier demodulating unit include decision module,Combination selection demodulator, (road k is simultaneously for parallel serial conversion module
Row turns serial)；The input terminal of the decision module input terminal connection multicarrier demodulating unit, is reflected by noncoherent detection technology
It the maximum m carrier signal of amplitude, m carrier signal Chu not be connected in symbol signalCombination selection demodulator；It is demodulating
It is 2 by the Combination conversion of the m carrier wave in devicekThe correspondence assembled state of system forms the road k parallel output；The output of the road k passes through
Parallel-serial conversion is connected to the output end of multicarrier demodulating unit.
The present invention is proposed to improve band efficiency and is based onThe multicarrier underwater sound frequency hopping for combining selector modulation is logical
Letter system.When workable sub-carrier number is N, modulation once can at most be transmittedA bit information, whereinAnd the MFSK modulation of same band can only once be transmittedA bit information.
It is proposed by the present invention to be selected based on NThe multicarrier More Secure Underwater Acoustic Frequency-Hopping Communication of selector modulation is combined, not only
The band efficiency of frequency hopping communications, improve data transfer rate can be effectively improved；Meanwhile the modulation carrier wave of each code element being fixed as
M, be conducive to the accuracy for improving noncoherent detection judgement.
It is of the invention beneficial to being modulated compared to traditional MFSK, improve the availability of frequency spectrum, efficiency of transmission is high；It compares
OOK, OFDM modulation are modulated number of carrier wave every time and are fixed, and transmission power is relatively stable, is easy to noncoherent detection, reduces error code
Rate.
Detailed description of the invention
Fig. 1 show FH-MFSK More Secure Underwater Acoustic Frequency-Hopping Communication block diagram；
Fig. 2, which is shown, to be based onCombine the multicarrier More Secure Underwater Acoustic Frequency-Hopping Communication block diagram of selector modulation /demodulation；
It is bent with the variation of available carrier wave number that Fig. 3 show the maximum fault information that the present invention and tradition MFSK modulation are once transmitted
Line；
Fig. 4 is shownCombine the modulation flow chart of selector；
Fig. 5 is shownCombine the demodulation flow chart of selector.
Specific embodiment
The invention proposes selected based on NCombine the multicarrier More Secure Underwater Acoustic Frequency-Hopping Communication of selector modulation.Such as figure
Shown in 2, including transmitting terminal and receiving end, transmitting terminal include coding unit, are based onThe multi-carrier modulation of combination selection modulator
Unit, frequency hopping modulation unit and underwater acoustic transducer transmitting unit, receiving end include underwater acoustic transducer receiving unit, frequency hopping demodulation list
Member is based onMulticarrier demodulating unit, the decoding unit of combination selection demodulator；The input terminal of coding unit connects information source, compiles
The output end of code unit is connected with the input terminal of multi-carrier modulation unit, multi-carrier modulation unit output end and frequency hopping modulation unit
Input terminal be connected, the output end of frequency hopping modulation unit is connected with underwater acoustic transducer transmitting unit；Underwater acoustic transducer receiving unit
Output end is connected with the input terminal of frequency hopping demodulating unit, the output end of frequency hopping demodulating unit and the input terminal of multicarrier demodulating unit
It is connected, the output end of multicarrier demodulating unit is connected with the input terminal of decoding unit, and decoding unit exports the stay of two nights；
Multi-carrier modulation unit includes serioparallel exchange module (it is parallel serially to turn the road k),Combination selection modulator, m load
Wave synthesis module；The input terminal of the input terminal connection multi-carrier modulation unit of serioparallel exchange module, the k that serioparallel exchange module is realized
Road output is connected toCombination selection modulator；In the modulator, the 2 of the road k input compositionkKind assembled state respectively corresponds
2 in combinationkA m carrier combination stateAnd the different and mutually orthogonal carrier wave of m frequency is exported by modulator；m
A carrier wave is input to carrier wave synthesis module, the output end of the output end connection multi-carrier modulation unit of carrier wave synthesis module；Overloading
Wave demodulating unit includes decision module,Combination selection demodulator, parallel serial conversion module (road k turns serial parallel)；Soft-decision
Module input connects the input terminal of multicarrier demodulating unit, identifies in symbol signal amplitude most by noncoherent detection technology
M big carrier signal, m carrier signal are connected toCombination selection demodulator；In demodulator, by the group of the m carrier wave
Conjunction is converted to 2kThe correspondence assembled state of system forms the road k parallel output；The output of the road k is connected to multicarrier by parallel-serial conversion
The output end of demodulating unit.
Fig. 3 is shown when being modulated using same number of subcarriers, and the present invention can once be transmitted with tradition MFSK modulation
Information content.Curve shows in figure: single carrier MFSK is modulated only in N=M=2kWhen, the information content of transmission can just change, and N ≠
2kWhen, the information content of transmission, N-2 can not be increased carrier number increasekA carrier wave is invalid；Compared to MSFK, the present invention
Transmission information content be with N value increase be continuously increased.The above analysis is it is found that the present invention can effectively improve the original of band efficiency
Because there are two aspects: first is that because using multi-carrier modulation technology；Fail second is that being effectively utilized in MFSK modulation using arriving
Carrier wave, this point is even more important in field of underwater acoustic communication, because the underwater sound communication system of available bandwidth critical constraints is available
Carrier number N is not usually just equal to 2k。
When workable number of subcarriers is N, the information carrying amount B (unit: bit) of each code element is indicated are as follows:
Wherein, N is greater than 2 positive integer；WhenWhen, B is maximized.
Compared with traditional More Secure Underwater Acoustic Frequency-Hopping Communication modulated based on MFSK, the raising coefficient ρ of message transmission rate
It can indicate are as follows:
Wherein, M=2k, k is positive integer；WhenWhen, ρ is maximized.
WithIllustrate the modem procedue of system for combination selector:Combine a total of 70 kinds of combinations shape of selector
State, it is 6 bits which modulates the maximum fault information that can be transmitted every time.
Compared with MFSK modulation technique, it is based onCombine raising of the multi-carrier modulation technology of selector to band efficiency
It is mainly manifested in two aspects: first is that using multi-carrier modulation；Second is that modulation carrier number N is no longer restricted to discrete value M (N=M
=2k) on, but the carrier wave for failing to be used in MFSK can be made full use of, i.e. the value range of N is [2k, 2k+1).The two exists
Transinformation under different modulating carrier number is as shown in Figure 3.
Table 1 show in 6 bit transfers 64 kinds of assembled states withCombine the modulatedemodulate of 64 kinds of assembled states in selector
Adjust the table of comparisons；Table 2 show the supplement list that 6 kinds of states of 1 " 1 " are contained only involved in table 1；Table 3 show in table 1 and relates to
And 6 kinds of states containing 5 " 1 " supplement list.
Transmitting terminal information source carries out channel coding by coding unit, by serioparallel exchange unit by the serial information after coding
It is parallel that bit stream is converted to 6 tunnels, constitutes one 6 two number b processed5b4b3b2b1b0It is input toCombination selection modulator, modulator
6 bit is converted to the combination of certain 4 carrier wave further according to the process of Fig. 4 by the table of comparisons 1, table 2 and table 3
f7f6f5f4f3f2f1f0It (when corresponding position is " 1 ", indicatesCombine selector selection and export the carrier wave), output to carrier wave synthesizes mould
Merged block is signal all the way, then by being emitted after frequency hopping unit completion frequency hopping modulation by underwater acoustic transducer transmitting unit.
Table 1
Table 2
Table 3
Fig. 4 modulates process: determining the number of " 1 " in 6 bits；When 0 " 1 ", 4 carrier waves of output are f6f2f1f0；1
When a " 1 ", fixed output f6f5, other 2 outgoing carriers are inquired further according to table 2；When 2 " 1 ", fixed output f7f6, and
f5f4f3f2f1f0=b5b4b3b2b1b0Export other 2 carrier waves；When 3 " 1 ", fixed output f7, and f5f4f3f2f1f0=
b5b4b3b2b1b0Export other 3 carrier waves；When 4 " 1 ", f5f4f3f2f1f0=b5b4b3b2b1b0Export 4 carrier waves；5 " 1 "
When, fixed output f6f4, other 2 outgoing carriers are inquired further according to table 3；When 6 " 1 ", 4 carrier waves of output are f6f5f4f3。
Receiving end receives signal by underwater acoustic transducer receiving unit, completes to demodulate in frequency hopping demodulating unit, after demodulation
Signal 4 maximum carrier signals of amplitude of output are adjudicated by noncoherent detection by decision module, it is corresponding extremely
f7f6f5f4f3f2f1f0In, 4 carrier combinations are converted to one 6 further according to the process of Fig. 5 by the demodulator table of comparisons 1, table 2 and table 3
Binary number, by reverting to serial information bit stream after parallel-serial conversion.
The demodulation process of Fig. 5: (1) determine receive in carrier wave whether contain f7If b will directly be exported by having5b4b3b2b1b0=
f5f4f3f2f1f0If without (2) are jumped to；(2) determine receive in carrier wave whether contain f6If no-trump exports b5b4b3b2b1b0=
f5f4f3f2f1f0If (3) will be jumped to by having；(3) determine receive in carrier wave whether contain f5f4If f5f4=" 00 " will export
b5b4b3b2b1b0=" 000000 ", if f5f4=" 11 " will export b5b4b3b2b1b0=" 111111 ", if f5f4=" 10 " are by basis
The inquiry output of table 2 b5b4b3b2b1b0If f5f4=" 01 " will inquire output b according to table 35b4b3b2b1b0。
Compared to the present invention, traditional 8FSK modulation technique with same carrier wave number is modulated every time can only transmit 3bits letter
Breath.
Claims (1)
1. based on N select m combination selector modulation multicarrier More Secure Underwater Acoustic Frequency-Hopping Communication, it is characterised in that including transmitting terminal with connect
Receiving end, the transmitting terminal include coding unit, are based onMulti-carrier modulation unit, the frequency hopping modulation unit of combination selection modulator
With underwater acoustic transducer transmitting unit；The receiving end includes underwater acoustic transducer receiving unit, frequency hopping demodulating unit, is based onCombination
Select the multicarrier demodulating unit and decoding unit of demodulator；
The input terminal of the coding unit connects information source, the input terminal phase of the output end and multi-carrier modulation unit of coding unit
Even, multi-carrier modulation unit output end is connected with the input terminal of frequency hopping modulation unit, the output end and the underwater sound of frequency hopping modulation unit
Energy converter transmitting unit is connected；
The output end of the underwater acoustic transducer receiving unit is connected with the input terminal of frequency hopping demodulating unit, frequency hopping demodulating unit it is defeated
Outlet is connected with the input terminal of multicarrier demodulating unit, the input terminal phase of the output end and decoding unit of multicarrier demodulating unit
Even, decoding unit exports the stay of two nights；
The multi-carrier modulation unit includes a serioparallel exchange module, oneCombination selection modulator, the road-load wave of a m close
At module；The input terminal of the input terminal connection multi-carrier modulation unit of the serioparallel exchange module, the k that serioparallel exchange module is realized
Road output is connected toCombination selection modulator；?In combination selection modulator, the 2 of the road k input compositionkKind assembled state point
It does not correspond to2 in combinationkA road-load wave assembled state of m,And byThe combination selection modulator output road m frequency is equal
Not identical and mutually orthogonal carrier wave；The road-load wave of m is input to carrier wave synthesis module, and the output end of carrier wave synthesis module connects overloading
The output end of wave modulation unit；
The multicarrier demodulating unit include decision module,Combination selection demodulator, parallel serial conversion module；The soft-decision
Module input connects the input terminal of multicarrier demodulating unit, identifies in symbol signal amplitude most by noncoherent detection technology
Big m road carrier signal, m road carrier signal are connected toCombination selection demodulator；?In combination selection demodulator, by the m
The Combination conversion of road-load wave is 2kThe correspondence assembled state of system forms the road k parallel output；The output of the road k passes through parallel-serial conversion mould
Block is connected to the output end of multicarrier demodulating unit.
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| CN108900221B (en) * | 2018-06-19 | 2020-09-11 | 哈尔滨工程大学 | Index modulation frequency hopping communication method based on IFFT/FFT framework |
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| CN101631099A (en) * | 2009-08-05 | 2010-01-20 | 华南理工大学 | Multi-input and multi-output selectivity OFDM underwater sound communication system and method |
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| CN103944848A (en) * | 2014-01-08 | 2014-07-23 | 华南理工大学 | Underwater acoustic anti-Doppler multicarrier modulation and demodulation method based on linear frequency modulation and device thereof |
| CN204559587U (en) * | 2015-04-29 | 2015-08-12 | 桂林电子科技大学 | Laser frequency hopping causes sound digital communication system under water |
| CN105515609A (en) * | 2015-11-20 | 2016-04-20 | 厦门大学 | Amplitude equalization circuit for mobile underwater sound frequency-hopping communication receiving system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105071819B (en) * | 2015-07-17 | 2017-12-15 | 西安空间无线电技术研究所 | The receiving handling method of multicarrier variable bit rate in a kind of fast frequency hopping system |
| CN106059980B (en) * | 2016-05-27 | 2019-03-29 | 电子科技大学 | It is a kind of based on fast frequency-hopped multi-carrier spread spectrum method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101631099A (en) * | 2009-08-05 | 2010-01-20 | 华南理工大学 | Multi-input and multi-output selectivity OFDM underwater sound communication system and method |
| CN103944848A (en) * | 2014-01-08 | 2014-07-23 | 华南理工大学 | Underwater acoustic anti-Doppler multicarrier modulation and demodulation method based on linear frequency modulation and device thereof |
| CN103888403A (en) * | 2014-04-03 | 2014-06-25 | 深圳市金频科技有限公司 | High-speed wavelet multi-carrier spread-spectrum communication system and method suitable for 5G network |
| CN204559587U (en) * | 2015-04-29 | 2015-08-12 | 桂林电子科技大学 | Laser frequency hopping causes sound digital communication system under water |
| CN105515609A (en) * | 2015-11-20 | 2016-04-20 | 厦门大学 | Amplitude equalization circuit for mobile underwater sound frequency-hopping communication receiving system |
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