Method for positioning main user in cognition radio network

A cognitive radio, primary user technology, used in radio wave measurement systems, positioning, wireless communications, etc., can solve problems such as the average utilization efficiency of the spectrum is less than 15%, the distance information cannot be obtained, and the application is limited.

Inactive Publication Date: 2009-04-29
TSINGHUA UNIV
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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 alg

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  • Method for positioning main user in cognition radio network
  • Method for positioning main user in cognition radio network
  • Method for positioning main user in cognition radio network

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Embodiment Construction

[0076] The method for locating a primary user (PU) in a cognitive radio network proposed by the present invention is described as follows with reference to the drawings and embodiments.

[0077] In a cognitive radio network with n SUs, it is assumed that PUs and SUs are evenly distributed in the network, and the positions of SUs and PUs remain unchanged during the positioning process. In each time slot, the SU needs to report the result of spectrum sensing (that is, the binary 1-bit information of whether the PU exists) to a common information processing unit, and the information collecting unit obtains the sensing result for positioning from each SU. After each time slot ends, each SU transmits the sensing result of each channel to the information collection unit through the above-mentioned MAC layer protocol. For a certain channel, the sum of these 0 and 1 results can get the vector X={x n , 1≤n≤N}. Assume that the number of time slots for sending sensing results is T n ,...

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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...

Claims

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Application Information

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IPC IPC(8): G01S5/02G01S5/14H04B17/00H04B17/27H04W64/00
Inventor 马志垚陈巍曹志刚
Owner TSINGHUA UNIV
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