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

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,...

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Bibliographic Details
Published in2011 20th Annual Wireless and Optical Communications Conference (WOCC) pp. 1 - 5
Main Authors Fangjiang Huang, Shaowei Wang, Sidan Du
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.04.2011
Subjects
Cognitive radio
Heuristic algorithms
Interference
Iterative methods
OFDM
Optimization
Resource management
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Summary: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.
ISBN:9781457704536
1457704536
ISSN:2379-1268
2379-1276
DOI:10.1109/WOCC.2011.5872290