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A mt-mfsk underwater acoustic communication method with high frequency band utilization

A technology of underwater acoustic communication and utilization rate, which is applied in the direction of multi-frequency code system, FM carrier system, and forward error control, and can solve the problems of MT-MFSK reliability reduction and other issues

Active Publication Date: 2020-04-24
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with MFSK, the reliability of MT-MFSK is reduced due to the non-orthogonal set of MT-MFSK signal carriers
To make full use of the advantages of MT-MFSK high-band utilization, it is necessary to find a suitable channel coding scheme to compensate for the reliability loss caused by the non-orthogonality of MT-MFSK signal carrier groups.

Method used

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  • A mt-mfsk underwater acoustic communication method with high frequency band utilization
  • A mt-mfsk underwater acoustic communication method with high frequency band utilization
  • A mt-mfsk underwater acoustic communication method with high frequency band utilization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Such as figure 1 As shown, the structure diagram of MT-MFSK underwater acoustic communication data packet with high frequency band utilization, each data packet is composed of packet synchronization, J data frames and tail synchronization.

[0093] Such as figure 2 As shown, the structure diagram of MT-MFSK underwater acoustic communication data frame of high frequency band utilization, each data frame is composed of frame synchronization, front guard interval, I multi-carrier symbols and post guard interval.

[0094] Such as image 3 As shown, the high frequency band utilization MT-MFSK underwater acoustic communication transmission flow chart, the high frequency band utilization MT-MFSK underwater acoustic communication transmission process includes the following steps:

[0095] First, the source bit stream is grouped, each group has L bits, and the L bits of any bit group are expressed as [a (1) ,...,a (L) ], the value is 0 or 1. The L bits of each group underg...

Embodiment 2

[0115] Table 1 provides a specific application example, the value of each parameter:

[0116] Table 1

[0117]

[0118] Such as image 3 As shown, the high-band utilization MT-MFSK underwater acoustic communication transmission process includes the following steps:

[0119] Step S1, grouping the information source bit stream, each group has 15104 bits.

[0120] Step S2, for each bit packet, calculate the CRC16 checksum, and add the 16-bit checksum to the end of the bit packet.

[0121] Step S3, splitting the bit packet after the CRC16 check is added into 2520 6-bit combinations, and each 6-bit combination forms a 64-ary symbol.

[0122] In step S4, perform 64 (7560, 2520) irregular repetitive accumulation coding on the 2520 64 symbols, and output 7560 64 symbols.

[0123] Such as Figure 4 As shown, for 2 M Base (L o , L i ) Irregular repeated accumulation coding, there is a p ∈GF(2 M )(0≤p≤L i -1) and b q 、c q 、d q 、e q ∈GF(2 M )(0≤q≤L o -1). Encoder inpu...

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Abstract

The invention proposes an MT-MFSK (Multiple Tone-M-ary Frequency Shift Keying) underwater acoustic communication method with a high frequency band utilization rate. The method comprises the followingsteps: step 1), at a transmitting end, grouping source bit streams to generate a plurality of 2M-nary symbols, performing non-binary irregular repeated accumulative coding on the plurality of 2M-narysymbols, performing MT-MFSK modulation and transformation to form a plurality of multi-carrier symbols, assembling the multi-carrier symbols into a data packet, converting the data packet into an analog signal through a DA chip, and sending out the analog signal by a transducer; and step 2), at a receiving end, performing amplification and AD conversion on the analog signal received by the transducer, after that, extracting the plurality of multi-carrier symbols, performing soft demodulation on each multi-carrier symbol to obtain soft channel information of a multi-nary symbol, performing iterative decoding of the non-binary irregular repeated accumulative coding, outputting a bit stream, and verifying the output bit stream after outputting the bit stream; if the verification is correct,ending the decoding; and if the verification is wrong, the maximum number of iterations is not reached, starting a new round of iterative decoding.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic communication, and in particular relates to an MT-MFSK underwater acoustic communication method with high frequency band utilization. Background technique [0002] With the increasing activities of human ocean development, ocean utilization and ocean exploration, the demand for underwater data acquisition and data transmission technology is also increasing. Sound waves can travel long distances in the ocean (underwater), and are the main information carrier in the ocean. The use of sound waves for underwater detection and communication is currently the most feasible technical means. [0003] Due to the dense reflection and refraction of the signal by the sea surface and the sea bottom, the multipath expansion of the underwater acoustic channel is very serious. The signal is Doppler shifted and Doppler spread due to carrier motion as well as channel interface and medium motion. The s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L27/10H04L1/00H04B11/00H04B13/02
CPCH04B11/00H04B13/02H04L1/004H04L1/005H04L1/0057H04L1/0071H04L1/0083H04L27/106H04L27/2656H04L27/2697
Inventor 张琳园武岩波朱敏李欣国郭卫振
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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