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
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[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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