CN109495128A - A kind of 5G multi-carrier spread spectrum underwater acoustic communication method based on chaos sequence - Google Patents

A kind of 5G multi-carrier spread spectrum underwater acoustic communication method based on chaos sequence Download PDF

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CN109495128A
CN109495128A CN201811478576.3A CN201811478576A CN109495128A CN 109495128 A CN109495128 A CN 109495128A CN 201811478576 A CN201811478576 A CN 201811478576A CN 109495128 A CN109495128 A CN 109495128A
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spread spectrum
data
sequence
signal
gfdm
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CN109495128B (en
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吴金秋
刘鹏云
康鹏斌
邵会兵
姚宏达
刘辉
王小虎
刘浩源
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Tangshan Zhaolan Ocean Technology Co Ltd
Beijing Institute of Control and Electronic Technology
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Beijing Institute of Control and Electronic Technology
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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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/001—Modulated-carrier systems using chaotic signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to a kind of 5G multi-carrier spread spectrum underwater acoustic communication method based on chaos sequence, belongs to field of underwater acoustic communication, is related to broad sense frequency division multiplexing water sound communication technique, chaos sequence spread-spectrum underwater sound communication technology.The invention proposes a kind of 5G multi-carrier spread spectrum underwater sound communication system suitable for underwater sound field, the effective information transmission in the underwater acoustic channel of limited bandwidth resources is realized, realizes the information transmission of no error code in an experiment.The purpose of the present invention is being directed to the limited field of underwater acoustic communication of channel width resource, a kind of effective information transferring method is provided, is of great significance to the development of underwater acoustic technology.

Description

A kind of 5G multi-carrier spread spectrum underwater acoustic communication method based on chaos sequence
Technical field
The present invention relates to a kind of 5G multi-carrier spread spectrum underwater acoustic communication method based on chaos sequence belongs to underwater sound communication neck Domain is related to broad sense frequency division multiplexing water sound communication technique, chaos sequence spread-spectrum underwater sound communication technology.
Background technique
Spread spectrum technic is the common technology in long range water sound communication technique, with the development of communication technology, is led to Letter mode can be divided into Direct Sequence Spread Spectrum (DS, Direct Sequence Spread according to the difference of spread spectrum method Spectrum), (TH, Time Hopping), arteries and veins when frequency hopping (FH, Frequency-Hopping Spread Spectrum), jump Reconstitute the frequency several ways such as (Chirp Modulation) and hybrid spread spectrum.
Field of underwater acoustic communication needs effective information transferring method.
Summary of the invention
The purpose of the present invention is being directed to the limited field of underwater acoustic communication of channel width resource, provide a kind of based on chaos sequence 5G multi-carrier spread spectrum underwater sound communication system.
The invention proposes a kind of 5G multi-carrier spread spectrum underwater sound communication systems suitable for underwater sound field, realize in bandwidth Effective information transmission in the limited underwater acoustic channel of resource, realizes the information transmission of no error code in an experiment.Mesh of the invention Be a kind of effective information transferring method to be provided, to underwater acoustic technology for the limited field of underwater acoustic communication of channel width resource Development be of great significance.
The present invention provides a kind of 5G multi-carrier spread spectrum underwater acoustic communication method based on chaos sequence, the method includes such as Lower step:
Step 1: in transmitting terminal, encoding source data, to the serial data data chaos spread spectrum sequence after coding Carry out spread spectrum operation；
Step 2: GFDM modulation is carried out to the data after spread spectrum, cyclic prefix is added to modulated data later, must be emitted Data；
Step 3: modulated signal is after underwater acoustic channel, in receiving end, synchronizes to data, GFDM demodulation；
Step 4: it to the data after demodulation, is de-spread using the locally generated chaotic signal in receiving end, to gained signal It integrates, adjudicate within the duration, obtain the data estimated to receiving end.
Preferably, the invention also includes the features of any one of selection 1-4:
1. spreading procedure in step 1 are as follows:
Emitting data indicates that then process may be expressed as: with d (t)
D (n) and the value for spreading chaos sequence c (n) used are 1 or -1, g (t) and p (t) is the duration to be respectively TbAnd TcUnit amplitude rectangular pulse, N represents the length of frequency expansion sequence, under normal circumstances, Tb=NTc.Sequence after spread spectrum P (t) are as follows:
P (t)=d (t) c (t)
Modulated process indicates in step 2 are as follows:
Be y (t) by the modulated data of GFDM, indicate GFDM modulated process with g [], then:
Y (t)=g [p (t)]=g [d (t) c (t)]
It may be expressed as: using the discrete spread-spectrum signal of the GFDM of BPSK modulation system
Wherein, dk[i] is the data on k-th of subcarrier, ck[j] represents it and corresponds to multiplied frequency expansion sequence, NcRepresent son Variable number, Δ f '=1/TcIt is subcarrier spacing.
2. carrying out GFDM demodulating process to reception signal in step 3 are as follows:
Under the premise of receiving end, accurate synchronization, GFDM demodulation is carried out to signal y ' (t) is received, uses g-1[] represents GFDM demodulating process, then may be expressed as: to despread signal r (t)
R (t)=g-1[y'(t)]。
3. to reception signal despreading process in step 4 are as follows:
Utilize locally generated chaos spread spectrum sequence c identical with transmitting terminalr(t) r (t) is de-spread:
M (t)=r (t) cr(t)=g-1[y'(t)]cr(t)
=g-1[g[d(t)c(t)]]cr(t)=d (t) c (t) cr(t)
To being integrated in the duration where signal:
Wherein the pulse duration of frequency expansion sequence c (t) is Tb, i.e.,
Therefore, q (t) may be expressed as:
Compared with prior art, the beneficial effects of the present invention are: realizing a kind of multi-carrier spread spectrum based on chaos sequence Underwater sound communication system, and the system has compared with the GFDM spread spectrum underwater sound based on common frequency expansion sequence with experimental verification by emulation Communication system better performance, can (other common frequency expansion sequences be in order to generate and chaos sequence using less sequence initial value Identical quantity needs more initial values, increases the transinformation of communication system, occupies valuable bandwidth resource, reduces and passes Defeated efficiency), it realizes the lower bit error rate of entire communication system, with modulator structure M=2, is analyzed for K=29, in white Gaussian Under noisy communication channel, when signal-to-noise ratio is -9dB, the 5G spread-spectrum underwater sound communication technological system of the present invention based on chaos sequence is real The bit error rate for using the underwater sound communication system of common frequency expansion sequence spread spectrum when signal-to-noise ratio is 4dB, performance boost 13dB are showed；It is more Under the underwater acoustic channel of way, when signal-to-noise ratio is -3dB, the underwater sound communication system for realizing common frequency expansion sequence spread spectrum is in signal-to-noise ratio Bit error rate when 6dB, performance boost 9dB.And the information transmission of no error code is realized in an experiment, it was demonstrated that should be based on chaos sequence GFDM spread-spectrum underwater sound communication system be it is a kind of completely newly can flexible utilization transmission channel bandwidth efficient communication system, be more suitable for In field of underwater acoustic communication.
Detailed description of the invention
Underwater sound spread spectrum system schematic diagram of the Fig. 1 based on chaos sequence；
Fig. 2 (a) chaos spread spectrum underwater acoustic system transmitting terminal schematic diagram and (b) chaos spread spectrum underwater acoustic system receiving end schematic diagram；
Fig. 3 modulator structure is M=2, different spread-spectrum underwater sound communication error rate of systems under the Gaussian white noise channel of K=29 Performance compares figure；
Fig. 4 modulator structure is M=2, different spread-spectrum underwater sound communication error rate of system performance ratios under the multi_path channel of K=29 Compared with figure；
Fig. 5 modulator structure is M=29, different spread-spectrum underwater sound communication error rate of systems under the Gaussian white noise channel of K=2 Performance compares figure；
Fig. 6 modulator structure is M=29, different spread-spectrum underwater sound communication error rate of system performance ratios under the multi_path channel of K=2 Compared with figure；
Fig. 7 tests channel impulse response；
Fig. 8 experiment transmitting receives picture (a), and frequency expansion sequence underwater sound communication system (M=2, K=are commonly used in transmitting image (b) 29) it is 0.0046 (d) that the bit error rate, which is 0.0119 (c) chaos spread spectrum underwater sound communication system reception image (M=2, the K=29) bit error rate, GFDM chaos spread spectrum underwater sound communication system receives image (M=29, K=2).
Specific embodiment
Direct-Spread underwater sound communication system of the primary study of the present invention based on GFDM it is advantageous that:
1. strong antijamming capability, the bit error rate is low
Spread spectrum technic carries out spread processing to transmitting signal in transmitting terminal, using frequency expansion sequence, will be shared by signal Original bandwidth expansion carries out despreading processing to transmission signal using coherence check method in receiving end, by the noise in transmission process Signal extension can extract echo signal by narrow-band filtering method at broadband signal, have relatively high noise Than can effectively improve the interference free performance of system, reduce the bit error rate of system.
2. concealment is good, intercept probability is low
Signal band after spread spectrum is broadened, and can be submerged in noise, is not easy to be intercepted and captured by enemy, is produced to the electronic equipment of surrounding A possibility that raw interference also very little.Military Application has a high potential, and is used for HF in external Military Communication Equipments, VHF and The frequency hopping wireless radio station of uhf band, Direct Sequence Spread Spectrum radio station also initially enter the practical stage.Therefore, have good hidden Property.
3. anti-multipath performance is good
Due to the good autocorrelation of spreading code, the signal after multi_path channel, which can be convenient, effectively to be extracted Come.
4. good confidentiality
Since the power spectral density of spread-spectrum signal is very low, signal is submerged in noise, and do not go the same way signal or different use The signal at family uses different pseudo-random sequence spread-spectrums, and recipient only knows that the correct ways of frequency expansion sequence could be de-spread Demodulate original information data.Therefore spread spectrum technic high reliablity, good confidentiality.
Spread spectrum system can be divided into time domain spread spectrum communication system and frequency domain expands according to the spread spectrum operation carried out in time domain and frequency domain Frequency communication system.On the one hand since underwater acoustic channel available bandwidth resources are limited, on the other hand since frequency domain spread spectrum can destroy son The correlation of intercarrier, therefore the present invention is for time domain spread spectrum expansion research.
Spread spectrum in the present invention uses chaos sequence, mainly there is following advantage:
Firstly, conventional spread spectrum sequence length is relatively fixed, it is 2n- 1, and optional spread spectrum number of codes then is few.And it mixes Ignorant sequence is due to sensitive to initial value, by changing the parameter of chaos system and the spread spectrum sequence of the available enormous amount of initial value Column, and sequence length can be arbitrarily arranged.Therefore alternative spread spectrum number of codes is very more, therefore, compared with conventional spread spectrum sequence With better confidentiality.
Secondly, chaos spread spectrum sequence itself has the characteristics such as aperiodicity, broadband and noise like, it is similar to random process, Make it during actual transmissions, is not easy to be found to intercept and capture.Therefore, system has considerable degree of security performance, is difficult to be broken It translates, can significantly improve the safety of communication system.
Finally, the generation of chaos sequence and duplication are easily, as long as at the beginning of providing a chaos system iterative formula and one Initial value can generate a chaos spread spectrum sequence.
Therefore, the above-mentioned advantage based on chaos sequence applies it to a kind of 5G overloading based on chaos sequence of the present invention In wave spread-spectrum underwater sound communication technology.
Time domain spread spectrum: it is as shown in Figure 1 that multicarrier time domain spread spectrum sends block diagram.Data-signal is gone here and there and turned in transmitting terminal It changes, later using the spreading code of time domain distribution, spread spectrum operation is carried out to each data symbol respectively, finally again passes through each The subcarrier of data different frequency after crossing spread spectrum is modulated, and finally realizes multicarrier time domain spread spectrum.It can be with from figure Find out, each all chips of transmitting data after time domain is spread is transmitted on one sub-carrier, illustrates that this is The ability of system contrary frequency Selective intensity is poor, and each emits data after time domain is spread, chip lengths and spread spectrum Code length is identical, therefore the ability for fighting time selective fading is stronger.
Common frequency expansion sequence underwater sound communication system is parallel to the road N and has completed the signal of spread spectrum progress GFDM tune System, under normal circumstances, parallel data number are less than the number of sub carrier wave of ofdm system.Common frequency expansion sequence underwater sound communication system will Multiple data after Direct-Spread carry out parallel transmissions, and in underwater sound communication, spread-spectrum signal is bandwidth limited, when spreading code compared with When long, transmission signal and receiving end synchronize be required to take a substantial amount of time, GFDM-DS spread spectrum system receiving end using being situated between above The method to continue, as shown in Fig. 2 (b).
Fig. 3 and Fig. 4 has been respectively compared under white Gaussian noise signal and multi_path channel, and the 3 of modulation matrix M=2, K=29 Rank, 5 ranks often use the bit error rate performance of frequency expansion sequence underwater sound communication system and chaos spread spectrum underwater sound communication system, can from figure Out, when m-sequence order is 5 (i.e. length is 63), common frequency expansion sequence underwater sound communication system be may be implemented and chaos spread spectrum water The close bit error rate performance of sound communication system.Equally, Fig. 5 and Fig. 6 has been respectively compared under white Gaussian noise signal and multi_path channel, Modulation matrix is M=29, and 3 ranks, 5 ranks of K=2 often use frequency expansion sequence underwater sound communication system and chaos spread spectrum underwater sound communication system Bit error rate performance, it can be deduced that similar conclusion, therefore not to repeat here.
Present invention is further described in detail with specific embodiment with reference to the accompanying drawing.
It tests and is carried out in May, 2017 in anechoic tank, pond is 25 meters long, and 15 meters wide, 10 meters high, peripheral pool, which is furnished with, to disappear Sound wedge.The working band of transmitting transducer is 3-8kHz, and laying depth is 3 meters, and receiving hydrophone uses standard hydrophone, cloth Putting depth is 3 meters, transmitting transducer and 5 meters of receiving hydrophone horizontal distance.Channel impulse response is surveyed as shown in fig. 7, maximum More way time delays are about that 5.5ms, sample frequency 48kHz are roll-offed with RC filter bank RRC filter group in two kinds of spread spectrum systems The comparison of experimental result is carried out in case where parameter.The GFDM-DS that is carried out using RC filter and RRC filter group and The transmitting and reception of GFDM-CSSS spread-spectrum underwater sound communication system.
The present invention includes the following steps:
Step 1: in transmitting terminal, encoding binary source data, expands the serial data data chaos after coding Frequency sequence carries out spread spectrum operation, wherein chaos spread spectrum process are as follows:
Fig. 2 (a) is that GFDM spread spectrum system spreads and de-spread transmitting terminal and receiving end schematic diagram, with frequency expansion sequence to carrying out Data after parallel-serial conversion carry out time domain spread spectrum, carry out GFDM modulation according to GFDM modulator approach later, obtain modulated number According to adding cyclic prefix, obtain transmitting data.In receiving end, synchronization is done to the signal received first, before guaranteeing to synchronize correctly It puts, the signal after synchronizing is demodulated, is de-spread, adjudicate, obtain after being integrated within the duration to gained signal later The data that receiving end estimates.Emitting data indicates that then process may be expressed as: with d (t)
D (n) and the value for spreading chaos sequence c (n) used are 1 or -1, g (t) and p (t) is the duration to be respectively TbAnd TcUnit amplitude rectangular pulse, N represents the length of frequency expansion sequence, under normal circumstances, Tb=NTc.Sequence after spread spectrum P (t) are as follows:
P (t)=d (t) c (t).
Step 2: GFDM modulation is carried out to the data after spread spectrum, cyclic prefix is added to modulated data later, must be emitted Data；
Be y (t) by modulated data, indicate GFDM modulated process with g [], then:
Y (t)=g [p (t)]=g [d (t) c (t)]
It may be expressed as: using the discrete spread-spectrum signal of the GFDM of BPSK modulation system
Wherein, dk[i] is the data on k-th of subcarrier, ck[j] represents it and corresponds to multiplied frequency expansion sequence, NcRepresent son Variable number, Δ f '=1/TcIt is subcarrier spacing.
Step 3: modulated signal is after underwater acoustic channel, in receiving end, synchronizes to data, GFDM demodulation；
Under the premise of receiving end, accurate synchronization, GFDM demodulation is carried out to signal y ' (t) is received, uses g-1[] represents GFDM demodulating process, then may be expressed as: to despread signal r (t)
R (t)=g-1[y'(t)]
Step 4: it to the data after demodulation, is de-spread using the locally generated chaotic signal in receiving end, to gained signal It integrates, adjudicate within the duration, obtain the data estimated to receiving end,
Utilize locally generated chaos spread spectrum sequence c identical with transmitting terminalr(t) r (t) is de-spread:
M (t)=r (t) cr(t)=g-1[y'(t)]cr(t)
=g-1[g[d(t)c(t)]]cr(t)=d (t) c (t) cr(t)
To being integrated in the duration where signal:
Wherein the pulse duration of frequency expansion sequence c (t) is Tb, i.e.,
Therefore, q (t) may be expressed as:
Fig. 8 (a) is experiment transmitting picture, and (b) and (c) is modulator structure M=2, the reception image of K=29, the bit error rate It is respectively as follows: 0.0119 and 0.0046.It (d) is modulator structure M=29, the common frequency expansion sequence underwater sound communication system of K=2 and mixed Ignorant spread-spectrum underwater sound communication system receives image, and the bit error rate is 0.
According to experimental result, identical in transmission signal occupied bandwidth, the subcarrier that different modulating matrix structure includes is divided equally In the case where channel resource, as sub-carrier number purpose increases, chaos spread spectrum underwater sound communication system and the common frequency expansion sequence underwater sound Communication system spread spectrum system performance has decline, because when number of sub carrier wave is more, it is each for non-orthogonal multi-carrier technology Main lobe overlapping is serious between subcarrier, and then results in the decline of error performance.Therefore, it on the one hand needs to design reasonable subcarrier Structure, avoids inter-carrier interference, on the other hand needs the reasonable channel estimation side of modulator structure researching and designing for GFDM Method removes influence of the channel to system, improves GFDM spread spectrum system performance.
Specific example described above is only presently preferred embodiments of the present invention, not does limit in any form to the present invention System, upper any simple modification to the above embodiments, equivalent variations, each fall within this according to the technical essence of the invention Within the protection scope of invention.

Claims (4)

1. a kind of 5G multi-carrier spread spectrum underwater acoustic communication method based on chaos sequence, which is characterized in that the method includes as follows Step:
Step 1: in transmitting terminal, encoding source data, is carried out to the serial data data after coding with chaos spread spectrum sequence Spread spectrum operation；
Step 2: GFDM modulation is carried out to the data after spread spectrum, cyclic prefix is added to modulated data later, obtains transmitting number According to；
Step 3: modulated signal is after underwater acoustic channel, in receiving end, synchronizes to data, GFDM demodulation；
Step 4: it to the data after demodulation, is de-spread using the locally generated chaotic signal in receiving end, gained signal is being held It integrates, adjudicate in the continuous time, obtain the data estimated to receiving end.
2. a kind of 5G multi-carrier spread spectrum underwater acoustic communication method based on chaos sequence according to claim 1, feature exist In: spreading procedure in step 1 are as follows:
Emitting data indicates that then process may be expressed as: with d (t)
The value of d (n) and the used chaos sequence c (n) of spread spectrum be 1 or -1, g (t) and p (t) be respectively be T the durationbAnd Tc Unit amplitude rectangular pulse, N represents the length of frequency expansion sequence, under normal circumstances, Tb=NTc, sequence p (t) after spread spectrum Are as follows:
P (t)=d (t) c (t)
Modulated process indicates in step 2 are as follows:
Be y (t) by the modulated data of GFDM, indicate GFDM modulated process with g [], then:
Y (t)=g [p (t)]=g [d (t) c (t)]
It may be expressed as: using the discrete spread-spectrum signal of the GFDM of BPSK modulation system
Wherein, dk[i] is the data on k-th of subcarrier, ck[j] represents it and corresponds to multiplied frequency expansion sequence, NcRepresent subcarrier Number, Δ f '=1/TcIt is subcarrier spacing.
3. a kind of 5G multi-carrier spread spectrum underwater acoustic communication method based on chaos sequence according to claim 1, feature exist In: GFDM demodulating process is carried out to reception signal in step 3 are as follows:
Under the premise of receiving end, accurate synchronization, GFDM demodulation is carried out to signal y ' (t) is received, uses g-1[] represents GFDM solution Tune process, then may be expressed as: to despread signal r (t)
R (t)=g-1[y'(t)]。
4. a kind of 5G multi-carrier spread spectrum underwater acoustic communication method based on chaos sequence according to claim 1, feature exist In: to reception signal despreading process in step 4 are as follows:
Utilize locally generated chaos spread spectrum sequence c identical with transmitting terminalr(t) r (t) is de-spread:
M (t)=r (t) cr(t)=g-1[y'(t)]cr(t)
=g-1[g[d(t)c(t)]]cr(t)=d (t) c (t) cr(t)
To being integrated in the duration where signal:
Wherein the pulse duration of frequency expansion sequence c (t) is Tb, i.e.,
Therefore, q (t) may be expressed as:
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CN111431835A (en) * 2020-03-25 2020-07-17 哈尔滨工程大学 Parallel multi-carrier-based high-efficiency underwater current field communication method

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Publication number Priority date Publication date Assignee Title
CN102833008A (en) * 2012-09-11 2012-12-19 哈尔滨工程大学 Spread spectrum underwater acoustic communication method
CN104753638A (en) * 2015-03-02 2015-07-01 西安理工大学 Chaos spreading spectrum underwater acoustic communication method
CN108933749A (en) * 2018-06-08 2018-12-04 天津大学 Novel aliasing broad sense frequency-division multiplex multi-carrier modulating system

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Publication number Priority date Publication date Assignee Title
CN102833008A (en) * 2012-09-11 2012-12-19 哈尔滨工程大学 Spread spectrum underwater acoustic communication method
CN104753638A (en) * 2015-03-02 2015-07-01 西安理工大学 Chaos spreading spectrum underwater acoustic communication method
CN108933749A (en) * 2018-06-08 2018-12-04 天津大学 Novel aliasing broad sense frequency-division multiplex multi-carrier modulating system

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CN111431835A (en) * 2020-03-25 2020-07-17 哈尔滨工程大学 Parallel multi-carrier-based high-efficiency underwater current field communication method

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