CARRIER FREQUENCY OFFSET ESTIMATION FOR MULTICARRIER COMMUNICATION SYSTEMS
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United States of America Patent
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Issued Date -
Aug 12, 2010
app pub date -
Jun 18, 2008
filing date -
Jun 19, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a method for carrier frequency offset (CFO) estimation for multicarrier communication systems. More particularly, but not limited to, the invention relates to CFO and timing estimation in communication systems that utilise multiple carriers to transmit signals. The multicarrier communication system has a large number of possible integer CFOs. First the received signal is auto-correlated (50) in the frequency domain to identify a set of most likely integer CFO values for further processing. Then the integer CFO is estimated (52) by using the channel impulse response on the set of most likely integer CFO values in the time domain to identify the value having the most energy concentrated within the first few temporal taps. The invention provides a two stage integer CFO estimation method that makes a trade off between performance and complexity. Aspects of the invention include a method, receiver, system and software.
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