CN110336595B - Mobile multi-input multi-output underwater acoustic communication method - Google Patents
Mobile multi-input multi-output underwater acoustic communication method Download PDFInfo
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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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- 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
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
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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 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
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:
wherein:
q is the number of subblocks; gamma rayk=afkT, Doppler coefficientfkIs the k frequency point, and T is the signal duration;
a frequency domain underwater sound channel of a k frequency point between the nth transmitting transducer and the mth hydrophone;
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:
whereinWeighting and combining the processed signals;is a weighting coefficient; "(.)H"denotes conjugate transpose; q is the number of subblocks, Q is 1,2, …, Q;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
Wherein:
a frequency domain underwater sound channel of a k frequency point between the nth transmitting transducer and the mth hydrophone;
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 sequencesAnd a Doppler coefficient a, whichInIs the frequency domain underwater acoustic channel of the k frequency point between the nth transmitting transducer and the mth hydrophone,
(4) the received signal is divided into a plurality of sub-blocks and FFT processing is performed separately. The FFT-processed signal is represented asWhere Q represents the total number of sub-blocks.
(5) And calculating a weighting coefficient. The weighting coefficient is
Wherein:
γk=afkT,fkis the k frequency point, and T is the signal duration;
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:
(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 asWherein Q represents the total number of sub-blocks, and the weighting coefficient of the weighting and combining process is as follows:
wherein:
q is the number of subblocks; gamma rayk=afkT, Doppler coefficientfkIs the k frequency point, and T is the signal duration;
a frequency domain underwater sound channel of a k frequency point between the nth transmitting transducer and the mth hydrophone;
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:
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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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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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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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