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Medium access control method based on CDMA underwater acoustic network

A medium access control, underwater acoustic network technology, applied in the direction of code division multiplexing system, advanced technology, electrical components, etc., can solve the problem of CDMA system performance impact and other issues

Inactive Publication Date: 2009-10-28
赵力
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, the performance of the CDMA system is easily affected by the near-far problem, which will cause strong multiple access interference

Method used

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  • Medium access control method based on CDMA underwater acoustic network
  • Medium access control method based on CDMA underwater acoustic network
  • Medium access control method based on CDMA underwater acoustic network

Examples

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Embodiment Construction

[0037] The technical solutions of the present invention will be further described below in conjunction with the drawings and embodiments.

[0038] figure 1 It is a simple sending and receiving example of the medium access control method based on CDMA underwater acoustic network. The basic principles of distributed power control can be summarized from this example. The relationship between the four nodes i, j, k, and s is as follows figure 1 shown. The dotted circle represents the maximum sending range of the node at its center. It can be seen that i and s are neighbor nodes of j, and j and k are neighbor nodes of i. Suppose j wants to send data packets to i, then its sending power P trans (ji) Two conditions must be met:

[0039] First, if j’s neighbor node s is receiving data packets from other nodes (the dotted arrow in the figure), then j’s transmission power P trans (ji) It cannot exceed a certain value to ensure that the reception of s is not affected.

[0040] ...

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Abstract

The invention discloses a medium access control method based on a CDMA underwater acoustic network for improving the network throughput, shortening end-to-end time delay and reducing the energy consumption so as to prolong the service life of the network. The invention adopts a CDMA access mode and a distributed power control technology, and nodes participating information transmission dynamically adjust data sending power according to network conditions on the premise that the nodes do not influence the normal sending and receiving of adjacent nodes so as to overcome the near-far effect existing in a CDMA system. Meanwhile, the invention improves a handshake mechanism in a traditional medium access control method, uses a data pocket to replace an ACK as a response for successful interaction in case of satisfying special conditions and can obtain higher performance under the conditions of different network loads so as to be effectively applied to reliable data transmission in the underwater acoustic network.

Description

technical field [0001] The invention relates to a medium access method, in particular to a medium access control method based on CDMA underwater acoustic network. Background technique [0002] The underwater acoustic network is mainly used for data collection, sampling, environmental monitoring, near-shore detection, disaster prevention, tsunami warning, navigation assistance, distributed tactical monitoring and mineral survey in the ocean. Because radio waves can only propagate at extremely low frequencies (30-300Hz) underwater, they are easily affected by scattering. Therefore, the nodes of the underwater acoustic network usually use sound waves for wireless communication. [0003] The method of media access control is an important content of underwater acoustic network research. Compared with terrestrial wireless channels, underwater acoustic channels have the characteristics of low data transmission rate, limited frequency band resources, and high bit error rate. At t...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B13/02H04J13/00
CPCY02D30/70
Inventor 赵力魏昕余华邹采荣奚吉
Owner 赵力
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