Method for positioning main user in cognition radio network

Abstract

The invention provides a method for positioning PU of cognitive radio networks. The method comprises the following steps: acquiring a plurality of detecting results on the PU based on MAC communication protocol through an idle channel capable of perceiving at least three SU of the PU within certain time slot; and based on the plurality of the detecting results in the last step, calculating and determining the position of the PU by an iterative algorithm of weighting least squares. The method has the advantage that the method acquires location algorithm-based positioning precision by utilizing a little information without basing on the location algorithm, and further improves the performance of positioning algorithm by introducing the iterative algorithm of weighting least squares. The deduction of Cramer-Rao theory performance limit and a plurality of imitations prove that the positioning error of the method is extremely similar to Cramer-Rao limit theory performance.

Description

technical field [0001] The present invention relates to the technical field of wireless network positioning, in particular to a positioning method for a PU (Primary User, primary user) in a cognitive radio network (Cognitive Radio Networks). Background technique [0002] The traditional spectrum allocation scheme allocates the spectrum to various wireless communication technologies fixedly. If a certain frequency band is not used at a certain time and place, this licensed frequency band cannot be occupied by other wireless applications. As a result, a large amount of idle spectrum cannot be effectively used, thereby greatly reducing the efficiency of using the spectrum. According to the 2002 research report of the Federal Communications Commission of the United States, the average utilization efficiency of spectrum is less than 15%. However, with the rapid development of wireless communication technologies, there are fewer and fewer spectrum resources available for allocati...

AI Technical Summary

Problems solved by technology

As a result, a large amount of idle spectrum cannot be effectively used, which greatly reduces the efficiency of spectrum use.

According to the 2002 research report of the Federal Communications Commission of the United States, the average utilization efficiency of spectrum is less than 15%.

Although the high-order geometric position algorithm is used, the positioning accuracy of this algorithm is always inferior to the distance-based algorithm because the relevant distance information cannot be obtained.

In the "Robust localization with unknown transmission power for cognitiveradio" published by S.Kim, H.Jeon and J.Ma et al. on Proc.IEEE MILCOM in November 2007, a positioning algorithm based on RSS ranging is proposed. However, the algorithm's requirement for accurate measurement of physical layer parameters limits its application in practical cognitive radio networks.

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