A Cooperative Spectrum Sensing Method Based on Distributed h Infinity Filtering Theory

Abstract

The invention relates to a distributed H infinity filter based cooperative spectrum sensing method. The distributed H infinity filter based cooperative spectrum sensing method comprises the steps that each sensing user in a cognitive wireless network firstly collects and receives wireless signals sent by an authorized user, calculates the energy values of the received signals, then builds a state transition equation of wireless channel shadow fading and performs distributed estimation on the wireless channel shadow fading; then each sensing user performs normalization processing on the energy values of the received signals by utilizing the estimation value of the wireless channel shadow fading and then performs local spectrum sensing; each sensing user sends the local spectrum sensing result to a sensing base station; and finally, the sensing base station performs decision fusion based on the local spectrum sensing result sent by each sensing user to obtain a final cognitive wireless network global spectrum sensing result. As the distributed H infinity filter used for estimating the wireless channel shadow fading received by each sensing user is adopted to remove influences from the wireless channel shadow fading to the spectrum sensing result, the distributed H infinity filter based cooperative spectrum sensing method can detect the spectrum of the authorized user equipment in the cognitive wireless network in a better manner.

Description

technical field [0001] The invention relates to a distributed cooperative spectrum sensing method applied in a cognitive wireless network. According to the H infinite filter theory, the method utilizes a distributed signal processing method to realize cooperative spectrum detection for authorized users. Background technique [0002] With the continuous development of wireless communication technology, how to improve the utilization efficiency of radio resources, especially spectrum resources, has become a research hotspot and a main technology development direction in the current communication field. In the cognitive wireless network, the cognitive users can cooperate with each other to perform distributed spectrum sensing on the authorized users in the cognitive wireless network, so as to quickly, comprehensively and accurately count the usage of a specific spectrum . Therefore, cooperative spectrum sensing is one of the best ways to improve the spectrum sensing performanc...

AI Technical Summary

Problems solved by technology

When the licensed user or the perceived user experiences time-varying wireless channel shadow fading, the energy detection of the licensed user's signal by the perceived user will become inaccurate, which will affect its spectrum sensing results

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