| Presentation | 2012-05-24 Frequency-dependent I/Q Imbalance Compensation for Wideband Quadrature Modulator using Sub-band Circuit Parameter Estimation Minseok KIM, Yuta MARUICHI, Jun-ichi TAKADA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper proposes a parametric method of frequency-dependent I/Q imbalance compensation for wideband quadrature modulators by means of the spectrum measurement of a radio frequency (RF) signal that is easily performed by a general purposed spectrum analyzer. The proposed method empirically estimates frequen-cy-dependent circuit parameters with only magnitude information of the frequency spectrum of the RF signal that can be fed back from the spectrum analyzer via Ethernet or GPIB. The frequency dependency in I/Q imbalance effect that is generated by the difference between the frequency responses of I and Q branches, is modeled by frequency-dependent circuit parameters. By dividing the whole signal band into several sub-bands, the transmitting signals are pre-distorted per individual sub-band in frequency domain. For estimating the frequency-dependent circuit parameters, in this paper, the modified method of steepest descent that has been developed for single-band compensation is extended to the frequency domain sub-band compensation scheme. By implementing an automatic sub-band circuit parameter estimation system, the compensation effect is demonstrated. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Quadrature modulator / I/Q imbalance / Image distortion / Method of steepest descent / Spectrum analyzer |
| Paper # | SR2012-2 |
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| Conference Information | |
| Committee | SR |
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| Conference Date | 2012/5/17(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Software Radio(SR) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Frequency-dependent I/Q Imbalance Compensation for Wideband Quadrature Modulator using Sub-band Circuit Parameter Estimation |
| Sub Title (in English) | |
| Keyword(1) | Quadrature modulator |
| Keyword(2) | I/Q imbalance |
| Keyword(3) | Image distortion |
| Keyword(4) | Method of steepest descent |
| Keyword(5) | Spectrum analyzer |
| 1st Author's Name | Minseok KIM |
| 1st Author's Affiliation | Graduate School of Science and Engineering, Tokyo Institute of Technology() |
| 2nd Author's Name | Yuta MARUICHI |
| 2nd Author's Affiliation | Graduate School of Science and Engineering, Tokyo Institute of Technology |
| 3rd Author's Name | Jun-ichi TAKADA |
| 3rd Author's Affiliation | Graduate School of Science and Engineering, Tokyo Institute of Technology |
| Date | 2012-05-24 |
| Paper # | SR2012-2 |
| Volume (vol) | vol.112 |
| Number (no) | 55 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |