Method and system for probing distributed cognitive radio channel

A cognitive radio and channel detection technology, applied in the field of cognitive radio channel detection, can solve problems that restrict the practical application of cognitive radio technology, and achieve the effect of reducing computational complexity and improving capabilities

Inactive Publication Date: 2009-11-04
FUDAN UNIV
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Problems solved by technology

The above problems have become the bottleneck of the development of cognitive rad

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  • Method and system for probing distributed cognitive radio channel
  • Method and system for probing distributed cognitive radio channel
  • Method and system for probing distributed cognitive radio channel

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Embodiment Construction

[0014] The present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0015] 1. Theoretical analysis

[0016] For the convenience of analysis, the present invention only considers the discrete data, that is, the discrete sampling values ​​of the wireless signal obtained by the cognitive radio user front-end through A / D sampling, and the analog signal can be compressed sensing (Analog-to-Information) to obtain the same The results of reference [6], Sami Kirolos, Jason Laska, Michael Wakin, Marco Duarte, Dror Baron, Tamer Ragheb, Yehia Massound, Richard Baraniuk, "Analog-to-Information conversion via Random Decodulation".Proc.IEEE Dallas Circuits and Systems Workshop (DCAS), 2006, described.

[0017] Consider a one-dimensional discrete real signal of finite length Here x is a very large time-domain discrete vector obtained by cognitive radio user terminals through A / D sampling of broadband wireless signals. Expanding the sign...

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Abstract

The invention provides a method and a system for probing a distributed cognitive radio channel. In a distributed cognitive network, random M users are selected, wherein M is less than N, and N is the length of discrete wireless signals; each user in the M users carries out inner product operation for respective wireless signals to acquire a compression sampling value respectively, and transmits the acquired compression sampling value to a fusion center; and the fusion center carries out frequency spectrum recovery for the wireless signals, and transmits back the frequency spectrum of the recovered wireless signals to each user terminal in the distributed cognitive network.

Description

technical field [0001] The invention relates to a cognitive radio channel detection method, in particular to a fast distributed cognitive radio channel detection method based on compressed sensing technology. The invention also relates to a distributed cognitive radio channel sounding system. Background technique [0002] In the cognitive radio system, it is one of the core technologies and difficult to detect the usage of the channel by sampling the wideband signal. The ability to accurately and quickly detect that each channel is occupied by authorized users is directly related to the channel usage efficiency of cognitive radio users, and is also a prerequisite for the normal operation of the cognitive radio system. [0003] The insatiable demands of today's wireless users for higher capacity, faster access speeds, and higher data throughput are driving higher and higher radio signal bandwidths. Based on the Nyquist sampling theorem, in order to restore the signal withou...

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Application Information

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IPC IPC(8): H04W24/00H04B17/00H04B17/30
Inventor 汪振兴杨涛冯辉胡波
Owner FUDAN UNIV
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