DocumentCode :
577253
Title :
Effect of I/Q imbalance on blind spectrum sensing for OFDMA overlay cognitive radio
Author :
Semiari, Omid ; Maham, Behrouz ; Yuen, Chau
Author_Institution :
Sch. of Electr. & Comput. Eng., Univ. of Tehran, Tehran, Iran
fYear :
2012
fDate :
15-17 Aug. 2012
Firstpage :
433
Lastpage :
437
Abstract :
Direct-conversion transceivers are in demand, due to their low cost implementation of analog front-ends. However, these transmitters or receivers introduce imperfections such as in-phase and quadrature-phase (I/Q) imbalances. These impairments can severely degrade the performance of cognitive radio devices that are based on orthogonal frequency division multiplexing (OFDM) multiple access schemes. In this paper, a cognitive radio system with an OFDMA primary system is considered. A new three-level hypothesis blind detector for spectrum sensing is introduced and the effect of I/Q imbalance on this detection scenario is studied. Finally, we show that the proposed detector is much less vulnerable to I/Q imbalance than conventional two-level detectors.
Keywords :
OFDM modulation; cognitive radio; frequency division multiple access; radio transceivers; I/Q imbalance; OFDMA overlay cognitive radio; OFDMA primary system; analog front-end; blind spectrum sensing; cognitive radio device; detection scenario; direct-conversion transceiver; in-phase imbalance; orthogonal frequency division multiplexing multiple access scheme; quadrature-phase imbalance; receiver; three-level hypothesis blind detector; transmitter; Cognitive radio; Detectors; Interference; Receivers; Signal to noise ratio; Cognitive radio; I/Q imbalance; OFDMA; blind detection; fading channels;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications in China (ICCC), 2012 1st IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4673-2814-2
Electronic_ISBN :
978-1-4673-2813-5
Type :
conf
DOI :
10.1109/ICCChina.2012.6356921
Filename :
6356921
Link To Document :
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