Weighting consistent optimization based broadband distributed cooperative compressed spectrum sensing method

Abstract

The invention discloses a weighting consistent optimization based broadband distributed cooperative compressed spectrum sensing method, which is characterized in that a weight corresponding to a sub-band on a spectrum signal in the next time of iterative reconstruction is directly set according to a spectrum signal reconstructed by the current iteration, so that the time cost of a spectrum reconstruction stage is effective reduced, and the timeliness of spectrum sensing is enhanced; and the weight corresponding to each sub-band is set according to different characteristics of each sub-band on the spectrum signal, so that a sub-band, on which an authorized user exists, on the spectrum signal is promoted to generate a signal value so as to reduce the error making possibility of spectrum reconstruction and increase the accuracy of spectrum reconstruction, thereby improving the spectrum sensing performance. Under the condition of reaching the same detection probability, the method requires less compressed sampling data, and the corresponding communication cost and sensing time are reduced, so that a sensing user can traverse the whole frequency band quickly and acquire occupation state information of each sub-band, and thus idle sub-bands can be more effectively utilized.

Description

technical field [0001] The invention relates to a wideband spectrum sensing method in cognitive radio, in particular to a wideband distributed cooperative compressed spectrum sensing method based on weighted consistent optimization. Background technique [0002] With the increasing demand for current wireless communication services, on the one hand, available wireless spectrum resources are increasingly scarce; on the other hand, the utilization rate of most licensed frequency bands is low. In response to the irrational use of wireless spectrum, cognitive radio (Cognitive Radio, CR) technology opportunistically accesses idle frequency bands for communication without interfering with the communication of authorized users (Primary User, PU) to achieve spectrum sharing. Improve spectrum utilization. Spectrum sensing, as a key technology in cognitive radio, continuously perceives the usage status of frequency bands and prepares for later spectrum analysis and decision-making. ...

AI Technical Summary

Problems solved by technology

Although the spectrum sensing method can improve the sensing performance, it does not make full use of the reconstructed spectrum signal, but treats the spectrum signal as a whole in the joint iterative reconstruction, without considering the frequency of each sub-band on the spectrum signal. Different characteristics, did not use the different characteristics of sub-bands to improve the accuracy of spectrum signal reconstruction to further improve spectrum sensing performance

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