By Topic

Resource allocation in OFDM-based multi-cell cognitive radio systems

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Fangjiang Huang ; Sch. of Electron. Sci. & Eng., Nanjing Univ., Nanjing, China ; Shaowei Wang ; Du, Sidan

In this paper we study the resource allocation problem for an OFDM-based multi-cell cognitive radio (CR) system, in which the secondary user (SU) of the CR system shares radio spectrum conditionally with the primary user (PU) of a licensed system. The SUs can use the whole licensed bandwidth of PUs, as long as the interference power introduced to the PUs is within the tolerable margin. Since the SUs of different CR cells can transmit signals using the same subchannels, the inter-carrier interference among the SUs should also be considered. We propose an efficient algorithm to allocate bits of OFDM subchannels in a single CR cell by jointly considering the transmitting power and interference constraints. An iterative algorithm is adopted to update the interference level of each cell until an equilibrium point is reached, which means the interference introduced to all PUs is below the predefined threshold while obtaining the maximum capacity. Simulation results show the proposed algorithm performs better than other methods.

Published in:

Wireless and Optical Communications Conference (WOCC), 2011 20th Annual

Date of Conference:

15-16 April 2011