Automatic frequency offset compensation in a TDD wireless OFDM communication system
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United States of America Patent
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Aug 24, 2010
Grant Date -
Jun 12, 2008
app pub date -
Jan 9, 2007
filing date -
Dec 11, 2006
priority date (Note) -
Expired
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Abstract
Offsets in the transmit clock in a wireless communication system are corrected by using data distributed over many frequencies. In the time domain the system uses separate copies of the same signal transmitted with a known spacing in terms of transmit clock signals. The variation of timing between the received signals yields an initial estimate that then is used in a closed loop tracking arrangement to yield and compensate for unpredictable rate changes caused by, for example, jitter, Doppler or thermal drift. The frequency offset for one channel can then be used to calculate the offset for other channels.
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