Abstract | ||
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Wireless communication systems incorporating coherent OFDM requires the estimation and tracking of the time-varying channel response for accurate demodulation of data at the receiver. In pilot-symbol-assisted (PSA) OFDM systems, the minimum mean-square-error (MMSE) estimator is a good channel estimation technique given that channel statistics are known. However, the major drawback of the MMSE estimator is its high computational complexity, which grows with number of pilots. Piecewise-linear interpolation is a low complexity solution to the channel estimation task. In this paper we derive exact expressions for the channel estimation error as a function of pilot spacing, channel statistics and channel noise, when piecewise-linear interpolation is incorporated. We compare the performance of piecewise-linear interpolation against that of a low complexity MMSE technique (piecewise-MMSE interpolation) under both matched and mismatched conditions of channel statistics. Results show that a piecewise-linear interpolator performs better than a mismatched piecewise-MSSE interpolator of same complexity. |
Year | DOI | Venue |
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2003 | 10.1109/PIMRC.2003.1264326 | PIMRC |
Keywords | Field | DocType |
ofdm | Demodulation,Channel spacing,Control theory,Computer science,Interpolation,Minimum mean square error,Algorithm,Communication channel,Real-time computing,Orthogonal frequency-division multiplexing,Estimator,Computational complexity theory | Conference |
Volume | Citations | PageRank |
1 | 4 | 0.57 |
References | Authors | |
2 | 2 |
Name | Order | Citations | PageRank |
---|---|---|---|
Chandranath R. N. Athaudage | 1 | 83 | 7.99 |
Dhammika Jayalath | 2 | 197 | 20.50 |