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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Yamaoka, A. Yamaguchi, K. Seto, I. |
| Copyright Year | 2008 |
| Description | Author affiliation: TOSHIBA Corp., Kawasaki (Yamaoka, A.; Yamaguchi, K.; Seto, I.) |
| Abstract | In recent mobile communication systems, impairments in analog circuits cannot be disregarded owing to the need to achieve high performance. Errors in analog circuits consist of a distortion of a power amplifier(PA), gain and phase imbalance in a quadrature modulator(QMOD) and a quadrature demodulator(QDEMOD), dc offset, frequency offset, and so on. Because of high accuracy of compensation, many techniques of error compensation by using digital signal processing have been studied recently. Digital predistorter(DPD), which can eliminate odd-order distortion caused by PA nonlinearity, is one of the compensation techniques. However, in the case that direct conversion architecture is used in a loop-back path, errors in a QMOD and a QDEMOD affect the performance of DPD. Previously, we proposed an error estimation technique for a QMOD and a QDEMDO by using a variable phase shifter and evaluated the performance through computer simulation. In this paper, we evaluate the performance through an experiment by image rejection ratio(IRR) and error vector magnitude(EVM) in the case that the output of a QMOD is directly connected to the input of a QDEMOD. The results show that IRR improvement after compensation is 10 dB at the output of the QMOD and EVM improvement after compensation is 10 dB at the output of the QMOD and 20 dB at the output of the QDEMOD. |
| Starting Page | 143 |
| Ending Page | 146 |
| File Size | 510508 |
| Page Count | 4 |
| File Format | |
| ISBN | 9781424414628 |
| DOI | 10.1109/RWS.2008.4463449 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2008-01-22 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Error analysis Demodulation Analog circuits Computer errors Mobile communication Phase distortion Power amplifiers Phase modulation Frequency Error compensation Phase shifters Quadrature modulators Quadrature demodulators Error estimation |
| Content Type | Text |
| Resource Type | Article |
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