Adaptive loading for orthogonal frequency division multiplex (OFDM) communication systems
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United States of America Patent
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May 27, 2014
Grant Date -
Aug 1, 2013
app pub date -
Mar 11, 2013
filing date -
Oct 8, 2008
priority date (Note) -
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Abstract
An orthogonal frequency division multiplex (OFDM) transmitter may adaptively load each sub-carrier, buffering less than an OFDM frame in order to reduce hardware requirements and latency. The transmitter may use feedback information from the receiver regarding the quality of the sub-carriers. In addition, combining repetition and puncturing to achieve a desired date rate per class further reduces hardware by simplifying or even eliminating an interleaver. Additional mitigation and even performance enhancement techniques are incorporated to address inter-class boundaries within an OFDM frame, such as introducing transition classes. Channel state information may be reported in various formats including full bitmap, changed subchannels, and reported bad subchannels.
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