TY - GEN
T1 - A novel compensation scheme for I/Q mismatch in OFDM low-if receiver
AU - Bae, Junghwa
AU - Ha, Won
AU - Ko, Heekwon
AU - Han, Kyuyeol
AU - Park, Jinwoo
PY - 2004
Y1 - 2004
N2 - I/Q processing structures widely used in today's communication receivers, such as the low-IF and direct conversion architecture, face serious problem of I/Q mismatch. In practice, due to the problem of analog part, such mismatch is unavoidable, which results in finite and insufficient rejection of the image signal. These effects cause the desired signal to be interfered by image signal. In this paper, we focus on the low-IF receiver based on OFDM technique as today's popular transmission method. So, we carried out signal analysis and effects of mismatched I/Q processing in the OFDM low-IF receiver. Also, we proposed a new scheme that can compensate I/Q mismatch by least squares method using null-carriers of OFDM symbol. And, the computer simulation results are provided in order to evaluate the performance of the proposed schemes. From the simulation results, the mismatch problem could be perfectly compensated by using only one OFDM symbol.
AB - I/Q processing structures widely used in today's communication receivers, such as the low-IF and direct conversion architecture, face serious problem of I/Q mismatch. In practice, due to the problem of analog part, such mismatch is unavoidable, which results in finite and insufficient rejection of the image signal. These effects cause the desired signal to be interfered by image signal. In this paper, we focus on the low-IF receiver based on OFDM technique as today's popular transmission method. So, we carried out signal analysis and effects of mismatched I/Q processing in the OFDM low-IF receiver. Also, we proposed a new scheme that can compensate I/Q mismatch by least squares method using null-carriers of OFDM symbol. And, the computer simulation results are provided in order to evaluate the performance of the proposed schemes. From the simulation results, the mismatch problem could be perfectly compensated by using only one OFDM symbol.
KW - Direct-conversion receiver
KW - I/Q imbalance
KW - I/Q mismatch
KW - Low-IF receiver
KW - SDR
KW - Software-defined radio
UR - http://www.scopus.com/inward/record.url?scp=11144305781&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=11144305781&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:11144305781
SN - 088986411X
SN - 9780889864115
T3 - Proceedings of the Fourth IASTED International Multi-Conference on Wireless and Optical Communications
SP - 340
EP - 345
BT - Proceedings of the Fourth IASTED International Multi-Conference on Wireless and Optical Communications
A2 - Fapojuwo, A.O.
T2 - Proceedings of the Fourth IASTED International Multi-Conference on Wireless and Optical Communications
Y2 - 8 July 2004 through 10 July 2004
ER -