@inproceedings{8a0e685db4e3490ebc193dda4c363d94,
title = "Second order suboptimal power allocation for OFDM-based cognitive radio systems",
abstract = "In this paper, a low complexity power loading algorithm that maximizes the downlink transmission capacity of the cognitive radio (CR) user while keeping the total interference introduced to different primary user (PU) bands below a specified threshold for an OFDM-based cognitive radio system is proposed. Our suboptimal algorithm is based on 2nd order interference tracking and nulling mechanism to allocate power at CR's sub-carriers. The performance of our proposed suboptimal schemes are compared with the performance of the classical power loading algorithms, e.g., water-filling, 1st order interference tracking, nulling, and other suboptimal schemes. Numerical results show that our algorithm has low complexity but obtains a higher channel capacity than some previous suboptimal algorithms. We dedicated also that for a given interference threshold, the 2nd order interference tracking mechanism has dynamic number of nulling posision. Finally we investigate the effect of imperfect channel gain information at transmitter.",
keywords = "Cognitive radio, Interference reduction, OFDM, Power allocation",
author = "Hoa, \{Nguyen Tien\} and Hieu, \{Nguyen Thanh\} and \{Van Duc\}, Nguyen and Guilllaume Gelle and Hyunseung Choo",
year = "2013",
doi = "10.1145/2448556.2448606",
language = "English",
isbn = "9781450319584",
series = "Proceedings of the 7th International Conference on Ubiquitous Information Management and Communication, ICUIMC 2013",
booktitle = "Proceedings of the 7th International Conference on Ubiquitous Information Management and Communication, ICUIMC 2013",
note = "7th International Conference on Ubiquitous Information Management and Communication, ICUIMC 2013 ; Conference date: 17-01-2013 Through 19-01-2013",
}