Cooperative spectrum sensing method based on double-threshold energy detection

Abstract

The invention discloses a cooperative spectrum sensing method based on double-threshold energy detection. The method includes the steps of performing double-threshold local determination on data perceived by a perception user locally, determining a frequency band to be occupied if the data is greater than the maximum and sending Presence to a data center, determining the frequency band to be idle if the data is smaller than the minimum and sending Absence to the data center, and packing and then sending statistics and the signal to noise ratio to the data center if the data is smaller than the maximum and greater than the minimum; storing the received statistics and the received signal to noise ratio in the data center, directly determining the frequency band to be occupied if the data center receives any one of Presence, reading the statistics and the signal to noise ratio of every perception user if the data center does not receive any Presence, utilizing the maximal-ratio combining principle to obtain the weighting factor of every statistic for further obtaining statistics after combination, and performing single-threshold cooperative spectrum sensing on the statistics after combination. The cooperative spectrum sensing method based double-threshold energy detection can detect whether different frequency bands are idle or not, is applicable to different noise environments, dynamically sets a soft decision threshold and improves the detection performance of a system.

Description

technical field [0001] The invention relates to the technical field of software radio information transmission, in particular to a cooperative spectrum sensing method based on double-threshold energy detection. Background technique [0002] While the development of mobile communication technology brings convenience to life, the coexistence of various communication systems and the emergence of various standards have caused difficulties in realizing regional roaming and compatibility and inheritance of communication systems. Traditional communication systems based on hardware are difficult to adapt to this situation. In this situation, these new standards limit the intercommunication and compatibility of various devices due to different radio frequency carrier frequencies and modulation methods, resulting in waste of funds and repeated investment. This requires a multi-mode mobile terminal to be compatible with existing and future at the same time various communication formats...

AI Technical Summary

Problems solved by technology

[0002] While the development of mobile communication technology brings convenience to life, the coexistence of various communication systems and the emergence of various standards have caused difficulties in realizing regional roaming and compatibility and inheritance of communication systems. Traditional communication systems based on hardware are difficult to adapt to this situation. In this situation, these new standards limit the intercommunication and compatibility of various devices due to different radio frequency carrier frequencies and modulation methods, resulting in waste of funds and repeated investment. This requires a multi-mode mobile terminal to be compatible with existing and future at the same time various communication formats

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