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Communication method for improving communication rate of double-differential spread spectrum underwater acoustic communication system

A technology for underwater acoustic communication and system communication, which is applied in transmission systems, digital transmission systems, phase modulation carrier systems, etc., and can solve the problems of low communication rate and small application range.

Active Publication Date: 2020-04-10
青岛国海通讯科技有限公司
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Problems solved by technology

[0005] The present invention aims to solve the problem that the current communication system combining direct sequence spread spectrum and double differential coding technology has a low communication rate and a small application range, and now provides a communication method for improving the communication rate of a double differential spread spectrum underwater acoustic communication system

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  • Communication method for improving communication rate of double-differential spread spectrum underwater acoustic communication system
  • Communication method for improving communication rate of double-differential spread spectrum underwater acoustic communication system
  • Communication method for improving communication rate of double-differential spread spectrum underwater acoustic communication system

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specific Embodiment approach 1

[0044] Specific implementation mode one: refer to Figures 1 to 4 Specifically explaining this embodiment, a communication method for improving the communication rate of a double differential spread spectrum underwater acoustic communication system described in this embodiment includes the following steps:

[0045] Step 1: At the transmitting end of the communication system, group the original binary data a[n] to be sent into groups of (k+1) bit data, and group the first bit data a of each group 0 [n] Perform phase shift keying modulation (BPSK), k is a positive integer.

[0046] Step 2: For each group of BPSK modulated a in step 1 0 [n] Perform double-difference encoding, and form all encoding results into an information sequence b[n];

[0047] Among them, the expression of the information sequence b[n] is as follows:

[0048] b[n]=b[n-1]z[n]

[0049] Among them, z[n]=z[n-1]a 0 [n],n=0,1,2,...,

[0050] When n=0, b[-1]=1, z[-1]=1.

[0051] Step 3: The remaining k bit dat...

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Abstract

The invention discloses a communication method for improving the communication rate of a double-differential spread spectrum underwater acoustic communication system, and relates to the technical field of underwater acoustic communication. The objective of the invention is to solve the problems of low communication rate and small application range of a current communication system combining directsequence spread spectrum and double differential coding technologies. According to the method, the M-element spread spectrum is adopted to replace a direct sequence spread spectrum algorithm, and onthe premise that the bit error rate performance is not affected, compared with a direct sequence spread spectrum communication system, the communication rate can be multiplied. The M-element spread spectrum technology and the double differential coding technology are combined, the method can be applied to mobile underwater acoustic communication. The system does not contain any channel estimationor Doppler tracking technology, so that the method has robustness for unpredictable interference in a mobile underwater acoustic communication environment. The method is not only suitable for remote mobile underwater acoustic communication, but also suitable for mobile underwater acoustic communication between an underwater manned vehicle and an unmanned submersible vehicle under a close-range condition.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic communication, and in particular relates to a communication rate improvement technology. Background technique [0002] For long-range, low signal-to-noise ratio, underwater acoustic communication with Doppler effect, the complexity of underwater acoustic channel is significant. In order to deal with the low signal-to-noise ratio in underwater acoustic communication to achieve reliable underwater acoustic communication, scholars at home and abroad have conducted in-depth research. Direct sequence spread spectrum technology is widely used in the field of underwater acoustic communication because of its good anti-multipath, anti-channel fading and low signal-to-noise ratio performance. However, limited by the narrow available bandwidth of the underwater acoustic channel, the communication rate of direct spread technology is very low. In order to increase the communication rate and obtai...

Claims

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Application Information

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IPC IPC(8): H04B13/02H04B1/69H04L1/00H04L27/20
CPCH04B1/69H04B13/02H04L1/0009H04L27/20
Inventor 周锋乔钢
Owner 青岛国海通讯科技有限公司
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