Timing synchronization for OFDM-based wireless networks
AssigneeMitsubishi Electric Research Laboratories, Inc.
InventorsCharles You, Henry Horng, Jin-Yun Zhang
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Abstract
Timing in a receiver is synchronized to an orthogonal frequency division multiplex (OFDM) signal transmitted over a channel. The OFDM signal includes multiple training symbols, including long and short training symbols. The first half of the training symbols are correlated with the second half to determine a coarse index which is used to adjust the unsynchronized OFDM. In the coursely adjusted OFDM signal, the first training symbol is then correlated with the last traininig symbol to determine a fine index to adjust the coarsely adjusted OFDM signal so that the receiver is synchronized with the transmitted OFDM signal.
Claims10
A method for synchronizing timing in a receiver to an orthogonal frequency division multiplex (OFDM) signal transmitted over a channel, the OFDM signal including a plurality of training symbols, comprising:
- coarse correlating, in an unsynchronized OFDM signal, a first half of the plurality of training symbols with a second half of the plurality of training symbols to determine a coarse index;
- coarse adjusting the unsynchronized OFDM signal with the coarse index;
- fine correlating, in the coarsely adjusted OFDM signal, a first of the plurality of training symbols with a last of the plurality of training symbols to determine a fine index;
- and
- fine adjusting the coarsely adjusted OFDM signal with the fine index to synchronize the timing of the receiver.
Dependencies are inferred from the claim text.