CN110336595A - A kind of mobile multiple-input and multiple-output underwater acoustic communication method - Google Patents

A kind of mobile multiple-input and multiple-output underwater acoustic communication method Download PDF

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Publication number
CN110336595A
CN110336595A CN201910613760.2A CN201910613760A CN110336595A CN 110336595 A CN110336595 A CN 110336595A CN 201910613760 A CN201910613760 A CN 201910613760A CN 110336595 A CN110336595 A CN 110336595A
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China
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signal
underwater acoustic
acoustic communication
communication method
input
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CN110336595B (en
Inventor
殷敬伟
葛威
韩笑
郭龙祥
朱广军
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Harbin Engineering University
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Harbin Engineering University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03891—Spatial equalizers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
    • 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

The present invention relates to field of underwater acoustic communication, more particularly to a kind of mobile multiple-input and multiple-output underwater acoustic communication method.The present invention is implemented as follows: (1) multiple transmitting transducers emit single-carrier signal simultaneously；(2) multiple receiving hydrophones receive signal simultaneously；(3) signal received is subjected to part FFT demodulation, and carries out AF panel processing；(4) by AF panel, treated that signal is decoded.The advantage of the invention is that (1) effectively inhibits Doppler effect；(2) effectively inhibit co-channel interference；(3) computation complexity is low.

Description

A kind of mobile multiple-input and multiple-output underwater acoustic communication method
Technical field:
The present invention relates to field of underwater acoustic communication, more particularly to a kind of mobile multiple-input and multiple-output underwater sound communication Method.
Background technique:
In recent years, the acoustic communication between underwater movable platform is receiving more and more attention.Based on single carrier Frequency domain multiple-input and multiple-output (MIMO) underwater sound communication system has peak-to-average power ratio low, the advantages such as transmission rate height.However it is moving Under dynamic scene, there are two large problems for the system: first is that serious Doppler effect brings the sharply decline of communication performance, second is that different There are co-channel interferences between transmitting antenna.In current such communication system, including the frequency domain mimo system based on Turbo equilibrium, base Though the frequency domain mimo system in phase correction can inhibit Doppler effect, there are still computation complexity height, cannot effectively press down The problem of co-channel interference processed.
Summary of the invention:
The purpose of the present invention is to provide a kind of mobile multiple-input and multiple-output underwater acoustic communication methods.
The object of the present invention is achieved like this:
Specific step is as follows:
(1) multiple transmitting transducers emit single-carrier signal simultaneously；
(2) multiple receiving hydrophones receive signal simultaneously；
(3) signal received is subjected to part FFT demodulation, and carries out AF panel processing；
(4) by AF panel, treated that signal is decoded.
The part FFT demodulation is will to receive signal to be divided into multiple sub-blocks, carries out FFT calculating to each sub-block respectively.
The described AF panel processing is that treated carries out IFFT after each sub-block signal is weighted merging treatment by FFT It calculates.
The weighting coefficient of the weighting merging treatment are as follows:
Wherein:
Q is sub-block number；γk=afkT, Doppler coefficientfkFor k-th of frequency point, T is letter Number duration；
The frequency domain underwater acoustic channel of k-th of frequency point between n-th of transmitting transducer and m-th of hydrophone；
Wherein l is other transmitting transducer labels in addition to n, σ2For noise power, I is unit battle array, " ()H" indicate altogether Yoke transposition.
The weighting merging treatment formula are as follows:
WhereinFor the signal after weighting merging treatment；For weighting coefficient；"(.)H" indicate conjugate transposition；Q is Sub-block number, q=1,2 ..., Q；For FFT treated signal.
The present invention has the advantages that
(1) effectively inhibit Doppler effect；
(2) effectively inhibit co-channel interference；
(3) computation complexity is low.
Specifically:
The present invention is with traditional single-carrier frequency-domain MIMO underwater acoustic communication method the difference is that the Processing Algorithm of receiving end. Receiving end is divided into multiple sub-blocks for signal is received, and carries out FFT demodulation, i.e. part FFT demodulation respectively to each sub-block.Then to each Sub-block FFT result is weighted merging, to reach inhibition intersymbol interference, the purpose of Doppler effect and co-channel interference.
Detailed description of the invention
Fig. 1 is the MIMO underwater acoustic communication method block diagram under mobile context；
Fig. 2 is system emulation ber curve.
Specific embodiment:
It illustrates with reference to the accompanying drawing and the present invention is described in more detail:
The present invention relates to field of underwater acoustic communication, more particularly to a kind of mobile multiple-input and multiple-output underwater sound communication Method.
The purpose of the present invention is to provide a kind of mobile multiple-input and multiple-output underwater acoustic communication methods.
The object of the present invention is achieved like this:
(1) multiple transmitting transducers emit single-carrier signal simultaneously；
(2) multiple receiving hydrophones receive signal simultaneously；
(3) signal received is subjected to part FFT demodulation, and carries out AF panel processing；
(4) by treated, signal is decoded.
The present invention has the advantages that
(1) effectively inhibit Doppler effect；
(2) effectively inhibit co-channel interference；
(3) computation complexity is low.
Specifically:
The present invention is with traditional single-carrier frequency-domain MIMO underwater acoustic communication method the difference is that the Processing Algorithm of receiving end. Receiving end is divided into multiple sub-blocks for signal is received, and carries out FFT demodulation, i.e. part FFT demodulation respectively to each sub-block.Then to each Sub-block FFT result is weighted merging, to reach inhibition intersymbol interference, the purpose of Doppler effect and co-channel interference.
The present invention is further described below: a kind of mobile multiple-input and multiple-output underwater acoustic communication method, the specific steps are as follows: (1) multiple transmitting transducers emit single-carrier signal simultaneously；(2) multiple receiving hydrophones receive signal simultaneously；(3) it will receive Signal carry out part FFT demodulation, and carry out AF panel processing；(4) by treated, signal is decoded.
The part FFT demodulation is divided into multiple sub-blocks for signal is received, and carries out FFT calculating to each sub-block.
Each sub-block is weighted merging treatment by the AF panel processing.
Weighting coefficient in the weighting merging treatment is
Wherein:
γk=afkT,fkFor k-th of frequency point, T is signal duration；
The frequency domain underwater acoustic channel of k-th of frequency point between n-th of transmitting transducer and m-th of hydrophone；
Wherein l is other transmitting transducer labels in addition to n, σ2For noise power, I is unit battle array.
1, the frequency domain MIMO underwater acoustic communication method specific implementation based on single carrier:
It is described in detail in conjunction with the communication means in 1 couple of present invention of attached drawing.
(1) transmitting terminal sends single-carrier signal.Original data stream is subjected to serioparallel exchange first, PSK modulation adds at CP Reason.Parallel data is passed through into n transmitting transducer transmitting later.
(2) receiving end receives signal.The signal received is carried out CP and handled by m hydrophone.
(3) channel estimation is carried out.Estimate to obtain channel using pilot frequency sequenceWith Doppler coefficient a, whereinIt is The frequency domain underwater acoustic channel of k-th of frequency point between n transmitting transducer and m-th of hydrophone,
(4) signal will be received and is divided into multiple sub-blocks, and carry out FFT processing respectively.Treated that signal is expressed as by FFTWherein Q indicates sub-block total number.
(5) weighting coefficient calculates.Weighting coefficient is
Wherein:
γk=afkT, fkFor k-th of frequency point, T is signal duration；
Wherein l is other transmitting transducer labels in addition to n, σ2For noise power, I is unit battle array, " ()H" indicate altogether Yoke transposition.
(6) each sub-block is weighted merging treatment:
(7) signal after weighting merging treatment is subjected to IFFT calculating, decoded later.
2, simulation study:
Simulated conditions:
The carrier frequency of single carrier 2 × 8MIMO communication system is 30kH, bandwidth 12kHz, and whens symbolic blocks is a length of 170.7ms, simulated channel maximum delay 4.2ms, Doppler coefficient a=10-4。
Attached drawing 2 is simulation result, it can be seen that the present invention has better communication performance under simulated conditions, and divides Block number is more, and system decoding performance is better.When block count reaches 8, decoding performance tends towards stability, when block count is greater than 8, performance There is no be obviously improved.
In summary: the purpose of the present invention is to provide a kind of mobile multiple-input and multiple-output underwater acoustic communication methods.The present invention Belong to field of underwater acoustic communication.The present invention is implemented as follows: (1) multiple transmitting transducers emit single-carrier signal simultaneously；(2) more A receiving hydrophone receives signal simultaneously；(3) signal received is subjected to part FFT demodulation, and carries out AF panel processing； (4) by treated, signal is decoded.The advantage of the invention is that (1) effectively inhibits Doppler effect；(2) effectively inhibit same Frequency interferes；(3) computation complexity is low.

Claims (5)

1. a kind of mobile multiple-input and multiple-output underwater acoustic communication method, it is characterised in that: specific step is as follows:
(1) multiple transmitting transducers emit single-carrier signal simultaneously；
(2) multiple receiving hydrophones receive signal simultaneously；
(3) signal received is subjected to part FFT demodulation, and carries out AF panel processing；
(4) by AF panel, treated that signal is decoded.
2. a kind of mobile multiple-input and multiple-output underwater acoustic communication method according to claim 1, it is characterised in that: the portion Dividing FFT demodulation is that will receive signal to be divided into multiple sub-blocks, carries out FFT calculating to each sub-block respectively.
3. a kind of mobile multiple-input and multiple-output underwater acoustic communication method according to claim 1, it is characterised in that: described is dry Disturbing inhibition processing is that will carry out IFFT calculating after FFT treated each sub-block signal is weighted merging treatment.
4. mobile multiple-input and multiple-output underwater acoustic communication method according to claim 3, it is characterised in that: the weighting is closed And the weighting coefficient handled are as follows:
Wherein:
Q is sub-block number；γk=afkT, Doppler coefficientfkFor k-th of frequency point, when T is signal It is long；
The frequency domain underwater acoustic channel of k-th of frequency point between n-th of transmitting transducer and m-th of hydrophone；
Wherein l is other transmitting transducer labels in addition to n, σ2For noise power, I is unit battle array, " ()H" indicate that conjugation turns It sets.
5. mobile multiple-input and multiple-output underwater acoustic communication method according to claim 3, it is characterised in that: the weighting is closed And handle formula are as follows:
WhereinFor the signal after weighting merging treatment；For weighting coefficient；"(.)H" indicate conjugate transposition；Q is sub-block Number, q=1,2 ..., Q；For FFT treated signal.
CN201910613760.2A 2019-07-09 2019-07-09 Mobile multi-input multi-output underwater acoustic communication method Active CN110336595B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008027616A1 (en) * 2006-08-31 2008-03-06 Sony Ericsson Mobile Communications Ab Mitigating interference caused by intermittent signal transmission in a multicarrier receiver
CN103491046A (en) * 2013-09-12 2014-01-01 江苏科技大学 Method for processing Doppler expansion of underwater sound high-speed OFDM communication
CN105490978A (en) * 2015-10-30 2016-04-13 哈尔滨工程大学 Asynchronous multi-user access method for underwater acoustic OFDM
CN205864457U (en) * 2016-04-27 2017-01-04 中国人民解放军空军工程大学 A kind of frequency diversity underwater sound communication modem
CN107682297A (en) * 2017-09-06 2018-02-09 西北工业大学 A kind of mobile underwater sound communication method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008027616A1 (en) * 2006-08-31 2008-03-06 Sony Ericsson Mobile Communications Ab Mitigating interference caused by intermittent signal transmission in a multicarrier receiver
CN103491046A (en) * 2013-09-12 2014-01-01 江苏科技大学 Method for processing Doppler expansion of underwater sound high-speed OFDM communication
CN105490978A (en) * 2015-10-30 2016-04-13 哈尔滨工程大学 Asynchronous multi-user access method for underwater acoustic OFDM
CN205864457U (en) * 2016-04-27 2017-01-04 中国人民解放军空军工程大学 A kind of frequency diversity underwater sound communication modem
CN107682297A (en) * 2017-09-06 2018-02-09 西北工业大学 A kind of mobile underwater sound communication method

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