OFDM communications methods and apparatus
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United States of America Patent
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Sep 8, 2015
Grant Date -
Apr 18, 2002
app pub date -
Aug 16, 2001
filing date -
Sep 13, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
OFDM signal communication methods and apparatus are described. In accordance with the invention OFDM signals are generated in the time domain with symbols being mapped to specific points in time. Training symbols may be included in the transmitted OFDM signal to facilitate symbol recovery. An exemplary receiver of the invention receives the OFDM signal from the communications channel, converts it into the frequency domain, and then filters it in the frequency domain to eliminate tones corresponding to other users. The filtered signal free of MAC interference is then converted into the time domain where channel estimation and compensation operations are performed. After channel compensation symbol recovery is performed in the time domain.
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