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Method, apparatus and computer program for sensing spectrum in a cognitive radio environment

A computer and spectrum technology, applied in wireless communication, spectrum gap assessment, electrical components, etc., can solve problems such as dynamic range reduction

Inactive Publication Date: 2011-01-19
NOKIA TECH OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventors realized that the dynamic range of the second ADC is significantly reduced in this proposal, although wideband signals may still have to be fully converted

Method used

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  • Method, apparatus and computer program for sensing spectrum in a cognitive radio environment
  • Method, apparatus and computer program for sensing spectrum in a cognitive radio environment
  • Method, apparatus and computer program for sensing spectrum in a cognitive radio environment

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Embodiment Construction

[0020] In one embodiment, the inventor's solution to the problem articulated above is to divide the spectrum sensing operation into three main parts: coarse wideband spectrum sensing; narrowing the frequency band and performing power analysis on the narrowed frequency band to finding candidate frequency bands; and finally analyzing the selected candidate frequency bands for free spectrum. In this embodiment, there is also a low power envelope detector operating constantly in the background to detect those signals that occur at long intervals. This envelope detector in turn gives the information to trigger spectrum sensing when it is necessary to detect those infrequently occurring signals.

[0021]This teaching details the details of sensing the surrounding radio spectrum and how to find free gaps from there. As noted above, an important requirement in mobile applications (besides basic functionality) is power consumption. These teachings exist in the context of spectrum sen...

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Abstract

To find frequency slots over which a cognitive radio can send an opportunistic transmission, a wideband spectrum is searched with a lower resolution to identify bandwidth slices having low or no signal levels. The identified bandwidth slices are searched with a higher resolution and candidate frequency slices are selected as those bandwidth slices having the least signal levels after the higher resolution searching, and ranked from the lowest signal level to the highest. A spectrum detection algorithm is executed on the selected candidate frequency slices in the order of the rank until it is decided that one of them has sufficiently free spectrum. A transmission is then opportunistically sent on the decided candidate frequency slice. Ongoing to the searching, intermittent signals are detected and a band about them is searched with the lower resolution to determine if the band about the detected intermittent signal is an identified bandwidth slice.

Description

technical field [0001] The present teachings generally relate to wireless networks and devices operating in such networks, and more particularly to sensing spectrum used in such networks, such as to avoid interference or otherwise manage spectrum usage. Background technique [0002] Spectrum sensing is required in cognitive radio to find gaps in the radio spectrum that can then be exploited in an opportunistic manner. Traditionally, the radio spectrum is divided between different radio systems in such a way that certain frequency bands are strictly assigned to certain systems. In the future, this strict allocation will be changed to a more flexible spectrum utilization, at least in some frequency bands. Primary users are those operating in more formal networks such as hierarchical networks (eg WLAN or cellular such as GSM, GERAN, UTRAN and E-UTRAN) and ad hoc networks (eg WiFi). Secondary users are those operating outside the formal network structure. Since substantially ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/14
CPCH04W16/14H04W72/02H04W24/00H04W72/085H04W72/542H04L27/0006
Inventor P·伊尔科南J·屈科南A·帕西南
Owner NOKIA TECH OY