Impacts of I/Q imbalance on QPSK-OFDM-QAM detection

Author

Liu, Chia-Liang

Author_Institution

Comput. & Commun. Res. Lab., Ind. Technol. Res. Inst., Hsinchu, Taiwan

Volume

44

Issue

3

fYear

1998

fDate

8/1/1998 12:00:00 AM

Firstpage

984

Lastpage

989

Abstract

The impacts of the I/Q imbalance in the quadrature down-converter on the performance of a QPSK-OFDM-QAM system are studied. Either amplitude or phase imbalance introduces inter-channel interference (ICI). In addition to the ICI, there is a cross-talk between in-phase and quadrature channels in each and every sub-carrier when both amplitude and phase imbalances are present. The BER (bit error ratio) performance of QPSK sub-carriers are also calculated to illustrate the impacts of the I/Q imbalance. It is observed that with the amplitude imbalance less than 1 dB and phase imbalance less than 5 degrees, the degradation of BER performance is less than 0.5 dB for a BER>10^-6

Keywords

crosstalk; demodulation; error statistics; frequency division multiplexing; interference (signal); quadrature amplitude modulation; quadrature phase shift keying; signal detection; BER performance; I/Q imbalance; QPSK sub-carriers; QPSK-OFDM-QAM detection; QPSK-OFDM-QAM system; amplitude imbalance; bit error ratio; crosstalk; demodulator; in-phase channels; inter-channel interference; performance; phase imbalance; quadrature channels; quadrature down-converter; Arm; Baseband; Bit error rate; Degradation; Demodulation; Interchannel interference; OFDM; Quadrature phase shift keying; RF signals; Radio frequency;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.713223

Filename

713223