Title :
A USRP-based experimental testbed for OFDM systems impaired by I/Q imbalance
Author :
Ozdemir, Onur ; Hamila, R. ; Al-Dhahir, Naofal
Author_Institution :
Dept. of Electr. Eng., Qatar Univ., Doha, Qatar
Abstract :
In this paper, an experimental testbed for packet based OFDM systems is proposed using USRP RF front-ends. I/Q imbalance estimation and compensation algorithms are implemented at the receiver by manually injecting I/Q imbalance at the transmitter and/or at the receiver. RX I/Q imbalance compensation is implemented in the time domain while the TX I/Q imbalance compensation is implemented in the frequency domain using a two-tap equalizer for each pair of a subcarrier and its image. The experimental results show significant improvement due to I/Q imbalance compensation.
Keywords :
OFDM modulation; compensation; equalisers; packet radio networks; radio receivers; radio transmitters; software radio; time-frequency analysis; OFDM system; RX I-Q imbalance compensation; TX I-Q imbalance compensation; USRP RF front-end; USRP-based experimental testbed; frequency-domain analysis; in-phase-quadrature branch; receiver; time-domain analysis; transmitter; two-tap equalizer; universal software radio peripheral; Baseband; Channel estimation; Estimation; Indexes; OFDM; Receivers; Transmitters; I/Q imbalance; IEEE 802.11.a; OFDM; SISO; USRP N210; experimental testbed;
Conference_Titel :
GCC Conference and Exhibition (GCC), 2013 7th IEEE
Conference_Location :
Doha
Print_ISBN :
978-1-4799-0722-9
DOI :
10.1109/IEEEGCC.2013.6705757
