CN110336595B - Mobile multi-input multi-output underwater acoustic communication method - Google Patents

Mobile multi-input multi-output underwater acoustic communication method Download PDF

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CN110336595B
CN110336595B CN201910613760.2A CN201910613760A CN110336595B CN 110336595 B CN110336595 B CN 110336595B CN 201910613760 A CN201910613760 A CN 201910613760A CN 110336595 B CN110336595 B CN 110336595B
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signal
fft
sub
weighting
underwater acoustic
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CN110336595A (en
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殷敬伟
葛威
韩笑
郭龙祥
朱广军
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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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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The invention relates to the field of underwater acoustic communication, in particular to a mobile multi-input multi-output underwater acoustic communication method. The invention is realized by the following steps: (1) a plurality of transmitting transducers simultaneously transmit single-carrier signals; (2) a plurality of receiving hydrophones simultaneously receive signals; (3) carrying out partial FFT demodulation on the received signal, and carrying out interference suppression processing; (4) and decoding the signal after the interference suppression processing. The invention has the advantages that (1) the Doppler effect is effectively inhibited; (2) co-channel interference is effectively inhibited; (3) the computational complexity is low.

Description

Mobile multi-input multi-output underwater acoustic communication method
The technical field is as follows:
the invention relates to the field of underwater acoustic communication, in particular to a mobile multi-input multi-output underwater acoustic communication method.
Background art:
in recent years, acoustic communication between underwater mobile platforms is receiving increasing attention. The frequency domain Multiple Input Multiple Output (MIMO) underwater acoustic communication system based on the single carrier has the advantages of low peak-to-average power ratio, high transmission rate and the like. However, in a mobile scenario, there are two major problems with this system: firstly, the severe Doppler effect brings the rapid reduction of communication performance, and secondly, the same frequency interference exists among different transmitting antennas. At present, in such communication systems, including a frequency domain MIMO system based on Turbo equalization, although the frequency domain MIMO system based on phase correction can suppress the doppler effect, the problem still exists that the computational complexity is high and the co-channel interference cannot be effectively suppressed.
The invention content is as follows:
the invention aims to provide a mobile multi-input multi-output underwater acoustic communication method.
The purpose of the invention is realized as follows:
the method comprises the following specific steps:
(1) a plurality of transmitting transducers simultaneously transmit single-carrier signals;
(2) a plurality of receiving hydrophones simultaneously receive signals;
(3) carrying out partial FFT demodulation on the received signal, and carrying out interference suppression processing;
(4) and decoding the signal after the interference suppression processing.
The partial FFT demodulation is to divide the received signal into a plurality of sub-blocks and perform FFT calculation on each sub-block.
The interference suppression processing is to perform IFFT calculation after weighting and combining processing on each sub-block signal after FFT processing.
The weighting coefficients of the weighting and combining process are as follows:
Figure BDA0002123238870000011
wherein:
Figure BDA0002123238870000012
q is the number of subblocks; gamma rayk＝afkT, Doppler coefficient
Figure BDA0002123238870000013
fkIs the k frequency point, and T is the signal duration;
Figure BDA0002123238870000014
Figure BDA0002123238870000015
a frequency domain underwater sound channel of a k frequency point between the nth transmitting transducer and the mth hydrophone;
Figure BDA0002123238870000021
where l is the index of the transmitting transducer other than n, σ2For noise power, I is the unit array, "()H"denotes conjugate transpose.
The weighting and combining processing formula is as follows:
Figure BDA0002123238870000022
wherein
Figure BDA0002123238870000023
Weighting and combining the processed signals;
Figure BDA0002123238870000024
is a weighting coefficient; "(.)H"denotes conjugate transpose; q is the number of subblocks, Q is 1,2, …, Q;
Figure BDA0002123238870000025
is the FFT processed signal.
The invention has the advantages that:
(1) the Doppler effect is effectively inhibited;
(2) co-channel interference is effectively inhibited;
(3) the computational complexity is low.
Specifically, the method comprises the following steps:
the difference between the method and the traditional single-carrier frequency domain MIMO underwater acoustic communication method is the processing algorithm of the receiving end. The receiving end divides the received signal into a plurality of sub-blocks, and each sub-block is respectively subjected to FFT demodulation, namely partial FFT demodulation. Then, the FFT results of each sub-block are weighted and combined so as to achieve the purpose of suppressing intersymbol interference, Doppler effect and same frequency interference.
Drawings
Fig. 1 is a block diagram of a MIMO underwater acoustic communication method in a mobile scene;
fig. 2 is a system simulation bit error rate curve.
The specific implementation mode is as follows:
the invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
the invention relates to the field of underwater acoustic communication, in particular to a mobile multi-input multi-output underwater acoustic communication method.
The invention aims to provide a mobile multi-input multi-output underwater acoustic communication method.
The purpose of the invention is realized as follows:
(1) a plurality of transmitting transducers simultaneously transmit single-carrier signals;
(2) a plurality of receiving hydrophones simultaneously receive signals;
(3) carrying out partial FFT demodulation on the received signal, and carrying out interference suppression processing;
(4) and decoding the processed signal.
The invention has the advantages that:
(1) the Doppler effect is effectively inhibited;
(2) co-channel interference is effectively inhibited;
(3) the computational complexity is low.
Specifically, the method comprises the following steps:
the difference between the method and the traditional single-carrier frequency domain MIMO underwater acoustic communication method is the processing algorithm of the receiving end. The receiving end divides the received signal into a plurality of sub-blocks, and each sub-block is respectively subjected to FFT demodulation, namely partial FFT demodulation. Then, the FFT results of each sub-block are weighted and combined so as to achieve the purpose of suppressing intersymbol interference, Doppler effect and same frequency interference.
The invention is further described as follows: a mobile multiple-input multiple-output underwater acoustic communication method comprises the following specific steps: (1) a plurality of transmitting transducers simultaneously transmit single-carrier signals; (2) a plurality of receiving hydrophones simultaneously receive signals; (3) carrying out partial FFT demodulation on the received signal, and carrying out interference suppression processing; (4) and decoding the processed signal.
The partial FFT demodulation divides a received signal into a plurality of sub-blocks, and performs FFT calculation for each sub-block.
And the interference suppression processing carries out weighting combination processing on each sub-block.
The weighting coefficients in the weighted combination process are
Figure BDA0002123238870000031
Wherein:
Figure BDA0002123238870000032
γk＝afkT，
Figure BDA0002123238870000033
fkis the k frequency point, and T is the signal duration;
Figure BDA0002123238870000034
Figure BDA0002123238870000035
a frequency domain underwater sound channel of a k frequency point between the nth transmitting transducer and the mth hydrophone;
Figure BDA0002123238870000036
where l is the index of the transmitting transducer other than n, σ2I is the unit matrix.
1. The frequency domain MIMO underwater acoustic communication method based on the single carrier is concretely realized as follows:
the communication method of the present invention will be described in detail with reference to fig. 1.
(1) The transmitting end transmits a single carrier signal. Firstly, the original data stream is processed by serial-parallel conversion, PSK modulation and CP processing. The parallel data is then transmitted through the n transmit transducers.
(2) The receiving end receives the signal. And the m hydrophones carry out CP removing processing on the received signals.
(3) And performing channel estimation. Channel estimation using pilot sequences
Figure BDA0002123238870000037
And a Doppler coefficient a, whichIn
Figure BDA0002123238870000038
Is the frequency domain underwater acoustic channel of the k frequency point between the nth transmitting transducer and the mth hydrophone,
Figure BDA0002123238870000039
(4) the received signal is divided into a plurality of sub-blocks and FFT processing is performed separately. The FFT-processed signal is represented as
Figure BDA0002123238870000041
Where Q represents the total number of sub-blocks.
(5) And calculating a weighting coefficient. The weighting coefficient is
Figure BDA0002123238870000042
Wherein:
Figure BDA0002123238870000043
γk＝afkT，fkis the k frequency point, and T is the signal duration;
Figure BDA0002123238870000044
Figure BDA0002123238870000045
where l is the index of the transmitting transducer other than n, σ2For noise power, I is the unit array, "()H"denotes conjugate transpose.
(6) And (3) weighting and combining the sub-blocks:
Figure BDA0002123238870000046
(7) the signals after the weighting and combining process are subjected to IFFT calculation, and then decoded.
2. Simulation research:
simulation conditions are as follows:
the carrier frequency of a single-carrier 2 multiplied by 8MIMO communication system is 30kH, the bandwidth is 12kHz, the symbol block duration is 170.7ms, the maximum time delay of an artificial channel is 4.2ms, and the Doppler coefficient a is 10-4。
Fig. 2 is a simulation result, which shows that the present invention has a better communication performance under the simulation condition, and the more the number of blocks is, the better the system decoding performance is. When the number of the blocks reaches 8, the decoding performance tends to be stable, and when the number of the blocks is more than 8, the performance is not obviously improved any more.
In summary, the following steps: the invention aims to provide a mobile multi-input multi-output underwater acoustic communication method. The invention belongs to the field of underwater acoustic communication. The invention is realized by the following steps: (1) a plurality of transmitting transducers simultaneously transmit single-carrier signals; (2) a plurality of receiving hydrophones simultaneously receive signals; (3) carrying out partial FFT demodulation on the received signal, and carrying out interference suppression processing; (4) and decoding the processed signal. The invention has the advantages that (1) the Doppler effect is effectively inhibited; (2) co-channel interference is effectively inhibited; (3) the computational complexity is low.

Claims (1)

1. A mobile multiple-input multiple-output underwater acoustic communication method is characterized in that: the method comprises the following specific steps:
(1) a plurality of transmitting transducers simultaneously transmit single-carrier signals;
(2) a plurality of receiving hydrophones simultaneously receive signals;
(3) carrying out partial FFT demodulation on the received signal, and carrying out interference suppression processing;
(4) decoding the signal after the interference suppression processing;
the partial FFT demodulation is to divide the received signal into a plurality of sub-blocks and perform FFT calculation on each sub-block respectively;
the interference suppression processing is that each sub-block signal after FFT processing is weighted and combined and then IFFT calculation is carried out;
the FFT-processed signal is represented as
Figure FDA0002974560920000011
Wherein Q represents the total number of sub-blocks, and the weighting coefficient of the weighting and combining process is as follows:
Figure FDA0002974560920000012
wherein:
Figure FDA0002974560920000013
q is the number of subblocks; gamma rayk＝afkT, Doppler coefficient
Figure FDA0002974560920000014
fkIs the k frequency point, and T is the signal duration;
Figure FDA0002974560920000015
Figure FDA0002974560920000016
a frequency domain underwater sound channel of a k frequency point between the nth transmitting transducer and the mth hydrophone;
Figure FDA0002974560920000017
where l is the index of the transmitting transducer other than n, σ2For noise power, I is the unit array, "()H"denotes conjugate transpose;
the weighting and combining processing formula is as follows:
Figure FDA0002974560920000018
wherein
Figure FDA0002974560920000019
Weighting and combining the processed signals;
Figure FDA00029745609200000110
is a weighting coefficient; "(.)H"denotes conjugate transpose; q is the number of subblocks, Q is 1,2, …, Q;
Figure FDA00029745609200000111
is the FFT processed signal.
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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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