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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Kexuan Sun Darwazeh, I. Li-Ke Huang Jones, A. |
| Copyright Year | 2012 |
| Description | Author affiliation: Aeroflex Ltd., Stevenage SG1 2AN, UK (Li-Ke Huang; Jones, A.) || Department of Electronic and Electronic Engineering, University College London, London WC1E 7LE, UK (Kexuan Sun; Darwazeh, I.) |
| Abstract | Current trends in low-cost and low power consumption transmitters in state-of-the-art wireless systems is to use the direct-conversion principle. Such transmitters, however, suffer severely from the I/Q imbalance effect, which introduces mirror-frequency interference and degrades data detection. This paper proposes a novel method for frequency-dependent I/Q imbalance estimation and compensation. The I/Q imbalance is estimated jointly in the frequency domain with very low complexity and minimum error variance, by relying on a specially designed pilot and its optimization. The performance and complexity of the algorithm are evaluated through both theoretical analysis and computer simulations. The simulation results are compared with those of existing techniques and show considerable advantages of the proposed algorithm. Moreover, a new time domain I/Q imbalance compensator structure is developed which delivers ideal compensation performance as well as the low complexity benefit. Both of the proposed estimation and compensation algorithms are implemented and their respective operation is verified on a test bed utilizing a commercial wideband direct-conversion based signal generator. Experimental results show excellent performance improvement in image rejection in the imbalanced modulator and a resultant very low EVM values below 0.5% across a frequency band of 90MHz. |
| Starting Page | 226 |
| Ending Page | 231 |
| File Size | 763679 |
| Page Count | 6 |
| File Format | |
| ISBN | 9781467304368 |
| ISSN | 15253511 |
| e-ISBN | 9781467304375 |
| DOI | 10.1109/WCNC.2012.6214171 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2012-04-01 |
| Publisher Place | France |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Maximum likelihood estimation Frequency domain analysis Complexity theory Time domain analysis Transmitters Channel estimation mirror-frequency interference I/Q imbalance digital calibration direct-conversion transmitter |
| Content Type | Text |
| Resource Type | Article |
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