| Publisher | University of Washington | ||
|---|---|---|---|
| Format | 519.2KB PDF, requires Acrobat Rdr 5 | Date added | 01 Sep 2004 |
| Topics | Modems | ||
| Downloads | 19 | ||
Orthogonal frequency division multiplexing (OFDM) transforms frequency-selective channels into multiple low-rate flat-fading subchannels. Carrier frequency offset between transmitter and receiver local oscillators must be estimated and compensated at the receiver to maintain orthogonality of these subchannels. In this paper the nonlinear least squares (NLS) estimator is derived for carrier frequency synchronization that exploits receiver diversity and known OFDM signal subspace structure due to the placement of unmodulated (virtual) subcarriers.
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