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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Petermann, M. Stefer, M. Wübben, D. Schneider, M. Kammeyer, K.-D. |
| Copyright Year | 2010 |
| Description | Author affiliation: Department of Communications Engineering, University of Bremen, 28359 Bremen, Germany (Petermann, M.; Wübben, D.; Kammeyer, K.-D.) || RF & Microwave Engineering Laboratory, University of Bremen, 28359 Bremen, Germany (Stefer, M.; Schneider, M.) |
| Abstract | In adaptive time division duplex (TDD) broadcast multi-antenna orthogonal frequency division multiplexing (OFDM) systems, non-reciprocal transceiver chains at the base station (BS) cause multi-user interference. This is due to the inappropriate spatial filter design at the BS based on the reverse link estimate. Hence, BS transceiver calibration is required. Provided that an estimate of the forward link channel is available at the BS, e.g., in a calibration phase, the transceiver parameters can be estimated by solving a total least squares (TLS) problem. In addition, if mutual coupling between the antennas exists the number of unknown front-end parameters to be estimated increases. Consequently, large matrices need to be decomposed via singular value decomposition (SVD) to attain a calibrated system. To deal with these large matrices a conjugate gradient (CG) method for solving the TLS problem iteratively is proposed in this paper. Simulation results show that the calibration based on the CG method achieves almost the same performance compared to the TLS solution but with significantly reduced complexity. |
| Starting Page | 285 |
| Ending Page | 289 |
| File Size | 329252 |
| Page Count | 5 |
| File Format | |
| ISBN | 9781424463152 |
| ISSN | 21540225 |
| e-ISBN | 9781424463176 |
| DOI | 10.1109/ISWCS.2010.5624277 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2010-09-19 |
| Publisher Place | United Kingdom |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | OFDM Bit error rate Channel estimation Downlink Transceivers Calibration Niobium |
| Content Type | Text |
| Resource Type | Article |
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