TY - GEN
T1 - Sidelobe suppression using extended active interference cancellation with self-interference constraint for cognitive OFDM system
AU - Qu, Daiming
AU - Wang, Zhiqiang
AU - Jiang, Tao
AU - Daneshmand, Mahmoud
PY - 2009
Y1 - 2009
N2 - To improve the spectrum utilization, more and more attention was paid to OFDM based opportunistic spectrum access (OSA) systems in recent years. In this paper, to enable coexistence between a secondary user and a primary user, a novel method called EAIC was proposed for spectral sculpting of OFDM signal effectively. In EAIC, however, the cancellation signals cause self-interferences to OFDM data tones so that the symbol-error-rate (SER) performance was degraded especially in high order modulation such as 64 QAM. In this paper, a new method called EAIC with self-interference constraint (EAIC-IC) is proposed, in which we analyze the interferences caused by cancellation signals, and then formulate an optimization problem to minimize both the total sidelobe power and the self-interferences. Simulation results show that the EAIC-IC method can provide a perfect tradeoff between spectrum notch depth and SER performance via adjusting the value of the constraint parameter.
AB - To improve the spectrum utilization, more and more attention was paid to OFDM based opportunistic spectrum access (OSA) systems in recent years. In this paper, to enable coexistence between a secondary user and a primary user, a novel method called EAIC was proposed for spectral sculpting of OFDM signal effectively. In EAIC, however, the cancellation signals cause self-interferences to OFDM data tones so that the symbol-error-rate (SER) performance was degraded especially in high order modulation such as 64 QAM. In this paper, a new method called EAIC with self-interference constraint (EAIC-IC) is proposed, in which we analyze the interferences caused by cancellation signals, and then formulate an optimization problem to minimize both the total sidelobe power and the self-interferences. Simulation results show that the EAIC-IC method can provide a perfect tradeoff between spectrum notch depth and SER performance via adjusting the value of the constraint parameter.
KW - Cognitive radio
KW - OFDM
KW - Oppotunistic spectrum access
KW - Out-of-band radiation
KW - Sidelobe suppression
UR - http://www.scopus.com/inward/record.url?scp=71749109787&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=71749109787&partnerID=8YFLogxK
U2 - 10.1109/CHINACOM.2009.5339921
DO - 10.1109/CHINACOM.2009.5339921
M3 - Conference contribution
AN - SCOPUS:71749109787
SN - 9781424443376
T3 - 2009 4th International Conference on Communications and Networking in China, CHINACOM 2009
SP - 219
EP - 223
BT - 2009 4th International Conference on Communications and Networking in China, CHINACOM 2009
T2 - 2009 4th International Conference on Communications and Networking in China, CHINACOM 2009
Y2 - 26 August 2009 through 28 August 2009
ER -