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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Can, O. Huaping Liu |
| Copyright Year | 2007 |
| Description | Author affiliation: Oregon State Univ., Corvallis (Can, O.; Huaping Liu) |
| Abstract | This paper derives a phase-noise suppression scheme for orthogonal frequency division multiplexing (OFDM) systems. This scheme is a maximum likelihood approach that exploits the pilot subcarriers that exist in almost all practical OFDM systems. Compared with existing work, the proposed scheme has the following features: (a) we focus on phase-noise suppression for time-varying environments, which also cause intercarrier interference (ICI) along with phase noise. Most of the existing work considers quasi-static channels and tries to suppress the common phase error (CPE). As will be shown in this paper, in more realistic fast time-varying channels, the CPE term becomes much more complex and might significantly degrade the performance of estimators that assume a time-invariant channel, (b) the proposed algorithm is applicable for the two most common types of local oscillators: phase-locked and free-running, which have different phase-noise characteristics, (c) the proposed phase-noise suppression scheme does not require perfect channel equalization, whereas in some of the existing work the channel is assumed to be known a priori, and (d) doubly-selective fading is considered rather than assuming a time-invariant and/or flat- fading channel. |
| Starting Page | 4346 |
| Ending Page | 4350 |
| File Size | 206102 |
| Page Count | 5 |
| File Format | |
| ISBN | 1424403537 |
| DOI | 10.1109/ICC.2007.717 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2007-06-24 |
| Publisher Place | UK |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Phase noise OFDM Time-varying channels Fading Maximum likelihood estimation Local oscillators Voltage-controlled oscillators Phase locked loops Autoregressive processes Phase estimation |
| Content Type | Text |
| Resource Type | Article |
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