Method for node to access multiple channels exactly and efficiently in underwater cognitive network

A cognitive network, multi-channel technology, applied in the field of accurate and efficient access of underwater cognitive nodes to multi-channel, can solve the problems of low spectrum utilization and long propagation delay

Inactive Publication Date: 2016-02-24
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

[0004] In order to improve the data communication problems caused by long propagation delay and low spectrum utilization in the underwater commun

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  • Method for node to access multiple channels exactly and efficiently in underwater cognitive network
  • Method for node to access multiple channels exactly and efficiently in underwater cognitive network
  • Method for node to access multiple channels exactly and efficiently in underwater cognitive network

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Embodiment Construction

[0019] The technical scheme provided by the present invention is as follows:

[0020] Step 1: Use the results of spectrum sensing to perform spectrum prediction. After spectrum sensing, the state information of each channel can be obtained, which can be divided into two states: idle state and occupied state, represented by "0" and "1" respectively. For the most important delay value d in this prediction method, it can be obtained from the data transmitted in the channel. Each data will be added with a time tag when it is sent, and the time information can be obtained through spectrum sensing and the transmission delay can be estimated. Statistical changes in the idleness and occupancy of each channel within a period of time, and calculate the channel state transition probability matrix P. Assuming that the channel state information probability matrix at the initial moment is S(n-d), the propagation delay of the channel is d, and it has been obtained by spectrum sensing, using ...

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Abstract

The invention relates to a method for a node to access multiple channels exactly and efficiently in an underwater cognitive network. The method comprises the steps of performing spectrum prediction by utilizing a spectrum sensing result and obtaining state information of each channel after the spectrum sensing; performing optimized allocation based on the current state information of each channel and each channel bandwidth as the optimization goal of spectrum allocation is the maximum channel gain, and the spectrum allocation emphasizes on considering maximization of a channel capacity; dividing multiple time slots in order to avoid long propagation delay of a sound signal and save energy, wherein each control packet and each data packet only can be sent at the start moment of one time slot; and transmitting data by adopting a message string mode, wherein each data transmitting node is required to transmit the data at the start moment of the time slot with the serial number being integer multiples of 4 after the channel allocation is ended. According to the method for the node to access multiple channels exactly and efficiently in the underwater cognitive network, effective throughput of an underwater network system is increased, and efficient transmission of communication data is realized.

Description

technical field [0001] The invention relates to the technical field of underwater cognitive acoustic communication, in particular to a method for accurate and efficient access of underwater cognitive nodes to multiple channels. Background technique [0002] The communication among nodes of underwater sensor network mostly adopts underwater acoustic communication which is suitable for long-distance underwater wireless communication. The underwater channel has high delay, delay dynamic change, high attenuation, high bit error rate, multipath effect, severe Doppler dispersion, highly dynamic change, low bandwidth, low channel utilization, fluctuation effect and marine environment noise Features. It is considered to be by far the most difficult wireless communication channel. Underwater nodes are powered by batteries, and it is more difficult to replace batteries. In addition, the energy consumption of nodes sending information is often many times greater than that of receivin...

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Application Information

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IPC IPC(8): H04L27/00H04B13/02H04B17/382
CPCH04L27/0006H04B13/02
Inventor 金志刚王健苏毅姗
Owner TIANJIN UNIV
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