Hello,

spectrum sensing is usually carried out in a wideband, in order to detect the free channels. It can be done by a sole sensor, or by numerous sensors. If they are sharing information, it is called cooperative spectrum sensing.

You should read these good overview papers:

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6179814

http://www2.ic.uff.br/~ejulio/doutorado/artigos/04796930.pdf

Regards,

Vincent

Dear sir

Spectrum sensing can be done by one user (single detection) or with the cooperation of multiple users (cooperative). in both cases we can make wideband sensing or norrowband sensing. Usually, we use for wideband sensing a frequency domain and for norrowband sensing temporal domain.

BR

Hi

From what I have been seeing, cooperative sensing is more on the algorithmic, mechanism level as opposed to the wideband which is performed by a single node, in the wideband case,  the work is much more DSP oriented.

The two techniques do not conflict, but rather are complementary. In fact, wideband spectrum sensing attempts to detect the primary activity in a wide frequency band. This implies that the frequency range is large (from hundreds of megahertz to several gigahertz) such that the channel frequency response can not be considered as flat and can dynamically change, compared to narrowband sensing techniques in which a single binary decision is made about the presence of the licensed traffic in the frequency channel of interest. On the other hand, cooperative spectrum sensing refers to the fact that multiple sensing outcomes are combined to infer a global decision whether in a wideband or a narrowband fashion. Most common techniques for cooperative sensing are the OR, AND and MAJORITY rule (binary symbols are combined according to or, and or majority rule).

I agree that the two techniques do not conflict, but rather are complementary.

Cooperative spectrum sensing is done by more than one user. The user share their experience about the channel and they decide whether it empty or not. This help in case of Hidden Terminals

Thanks to all..!!