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Frequency spectrum detection method based on partially observable Markov decision process model

A process model and spectrum detection technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve the problem that the spectrum prediction method cannot directly use the underwater communication system, so as to reduce the probability of data collision, improve the spectrum utilization rate and Effect

Inactive Publication Date: 2015-09-30
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect that the spectrum prediction method in the prior art cannot be directly applied to the underwater communication system, thereby providing a spectrum detection method suitable for underwater communication

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  • Frequency spectrum detection method based on partially observable Markov decision process model
  • Frequency spectrum detection method based on partially observable Markov decision process model
  • Frequency spectrum detection method based on partially observable Markov decision process model

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Embodiment Construction

[0022] The present invention will be further described now in conjunction with accompanying drawing.

[0023] A basic cognitive cycle in cognitive radio goes through three basic processes: 1) Spectrum sensing, whose role is to detect licensed frequency bands and find "blank" available spectrum resources; 2) Channel state estimation and capacity prediction, whose role It is to analyze the characteristics of the "blank" frequency band, estimate the change of the channel state and predict the capacity; 3) Spectrum management, the purpose is to select the appropriate "blank" frequency band according to the user's needs, and determine the transmission power and modulation method. The spectrum detection method of the present invention involves the first two stages of the cognitive cycle. On the basis of the spectrum sensing results, it conducts reasonable statistical analysis on the spectrum sensing results, and then predicts the channel usage status at a certain moment in the future...

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Abstract

The invention relates to a frequency spectrum detection method based on a partially observable Markov decision process model. The frequency spectrum detection method comprises the steps that channel state information is added to a channel state historical information sequence, and time delay is estimated so that the channel state information is obtained; the channel initial belief state and state transition probability of each channel are calculated; statistical information of the channel use state and the state transition probability are acquired through observation for a period of time, and a Markov model is established for the use state of each channel; when a time slot increases, the state historical information sequence and the current time slot value are updated; instantaneous remuneration is calculated via combination of the response information update belief state according to the state transition probability of the channels; the value function of each channel after performing different behaviors is calculated; and the maximum discount return acquired by secondary users is calculated and a strategy that the discount total remuneration is the maximum bandwidth is obtained, the channels are ordered in a decreasing way according to the total remuneration of each channel, and a user is guided to try to be accessed to the channels according to the new channel order if data transmission is required.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to a spectrum detection method based on a partially measurable Markov decision process (POMDP) ​​model in a cognitive underwater acoustic communication system. Background technique [0002] With the rapid development of modern information technology and ocean development technology, people's demand for underwater acoustic communication is increasing. How to realize high-speed underwater acoustic communication and effective sharing of underwater spectrum resources has become an urgent problem to be solved. Cognitive radio is a new intelligent wireless communication technology that has emerged in recent years. It can perceive the surrounding environment, use the "understanding-construction" method to obtain information from the surrounding environment, and change the transmission power, carrier frequency, modulation mode, etc. in real time. Transfer parameters to adapt...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/382
Inventor 宋佳陈新华孙长瑜余华兵
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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