Cooperative Spectrum Sensing Method Based on Birth-Death Process and Viscous Hidden Markov Model

Abstract

The invention discloses a cooperative spectrum sensing method based on a birth-death process and a viscous hidden Markov model, which uses the corresponding received signal power of each cognitive user in each channel as the observation data of the hidden Markov model, and then Determine the hidden state of the observed data, the probability of belonging to various hidden states, and the state transition probability matrix; introduce the sticky factor to obtain the sticky hidden Markov model; calculate the clustering results of the hidden state of the observed data at each iteration, and pass birth and death The process updates the clustering results and the number of hidden state categories, and calculates the state transition probability matrix, mean vector, and precision matrix; after the iteration, calculate each cognitive The power estimation value of the user in each channel is compared with the threshold value to determine whether the channel of a cognitive user is occupied by an authorized user; the advantage is that it performs spectrum sensing for multiple cognitive users, and the spectrum sensing performance is good.

Description

technical field [0001] The invention relates to a multi-cognitive user spectrum sensing technology in a cognitive radio, in particular to a cooperative spectrum sensing method based on a birth-death process and a sticky hidden Markov model. Background technique [0002] Compared with the fourth-generation mobile communication technology, the fifth-generation mobile communication (5G) technology can increase the data rate to 10Gbit / s, reduce the delay to 1 millisecond, and increase the number of connected devices by 100 times. The realization of these requirements depends on a large number of spectrum resources, but the available spectrum resources are limited and have basically been allocated. In order to solve the problem of shortage of spectrum resources in wireless networks, a common idea in the industry is to introduce cognitive radio technology to improve the utilization of spectrum resources. Different from the traditional system where the frequency band is occupied b...

AI Technical Summary

Problems solved by technology

However, existing cooperative spectrum sensing schemes often utilize hard decisions (i.e., cognitive users only send local decision results to the fusion center for global decision-making) to achieve detection, which does not consider more perceptual information of each cognitive user ( Such as sample average power information) and possible malicious user interference in the scene, resulting in generally unsatisfactory spectrum sensing performance

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