Title :
Preventing the transmission of harmful cognitive radio users in the presence of primary users
Author :
Fathollahi, Mona ; Soleimanipour, Majid
Author_Institution :
Sharif Univ. of Technol., Tehran, Iran
Abstract :
A cognitive radio provides access to a licensed spectrum for unlicensed users opportunistically provided that they are not harmful for licensed users (primary users). We call a cognitive radio user (CR user) harmful, when it generates interference for primary users (PU) or occupies spectrum holes excessively. This paper discusses the spectrum management policy against harmful CR users. For this, we design a jammer signal which ruins transmission of harmful CR users and forces them to leave the spectrum without damaging the communication of PUs. This signal is designed using group subspace technique for both synchronous and asynchronous channels. Our simulation results show that the designed jammer signal generates effective interference to harmful CR user while maintains performance of PUs.
Keywords :
cognitive radio; interference (signal); jamming; radio spectrum management; asynchronous channels; group subspace; harmful cognitive radio users; interference; jammer signal; licensed spectrum; primary users; spectrum holes; spectrum management policy; unlicensed users; Bit error rate; Cognitive radio; Eigenvalues and eigenfunctions; Fading; Jamming; Multiaccess communication; Noise; Jammer; cognitive radio; harmful cognitive radio users; spectrum management; subspace decomposition;
Conference_Titel :
Cognitive Wireless Systems (UKIWCWS), 2009 First UK-India International Workshop on
Conference_Location :
New Delhi
Print_ISBN :
978-1-4577-0182-5
DOI :
10.1109/UKIWCWS.2009.5749422