碩士 / 國立清華大學 / 電機工程學系 / 99 / Orthogonal frequency division multiplexing (OFDM) have been widely adopted in modern
wireless systems due to its ability to combat intersymbol interference (ISI) and frequency
selectivity. However, OFDM systems are extremely sensitive to phase noise that may exist
during the up and down-conversion at the transmitter and receiver sides. Phase noise causes
two main detrimental effects: common phase error (CPE) and intercarrier interference (ICI).
In this work, an iterative procedure is proposed where phase noise estimation (i.e., estimation
of CPE and ICI) and data detection are performed interchangeably. The estimated phase
noise parameters are assumed to be perfect when performing data detection and the detected
data symbols are assumed to be correct when performing the phase noise estimation. To do
this, we adopt the subspace-based pilot insertion scheme where pilot symbols are embedded
in a subspace orthogonal to that of the data symbols. The conventional scheme that allocates
a given number of subcarriers for pilot transmission can be viewed as a special case of the
subspace-based approach, but this may not be the best choice of pilot and data subspaces.
The efficacy of the proposed scheme is demonstrated through numerical simulations.
| Identifer | oai:union.ndltd.org:TW/099NTHU5442038 |
| Date | January 2011 |
| Creators | Tseng, Yu-Hsiang, 曾裕翔 |
| Contributors | Hong, Yao-Win Peter, Ueng, Yeong-Luh, 洪樂文, 翁詠祿 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 30 |
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