Frequency domain equalizer for wireless communications system
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United States of America Patent
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Apr 27, 2010
Grant Date -
Sep 11, 2008
app pub date -
Mar 17, 2008
filing date -
Sep 12, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to wireless communications and is particularly applicable to devices and modules for correcting errors introduced to a wireless signal after its transmission. An equalizer is provided which compensates for undesirable effects on received radio signals introduced by either signal processing or by the transmission medium. In operation, the equalizer multiples the complex received signal with a complex corrective signal that compensates for these effects. A tap corrective signal corrects for time-varying channel effects (i.e. channel distortions), a timing tracking signal corrects for carrier frequency offset errors, and a phase tracking signal corrects for sampling frequency offset errors.
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