Channel estimation in optical communication based on orthogonal frequency division multiplexing
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United States of America Patent
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Apr 12, 2016
Grant Date -
Jul 17, 2014
app pub date -
Aug 10, 2012
filing date -
Aug 12, 2011
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Abstract
Techniques for optical communications using optical orthogonal frequency division multiplexing (OFDM) include operating a signal transmitter to modulate laser light to produce modulated light that carries, in optical domain, OFDM subcarriers for carrying communication information, without a frequency guard band between the OFDM subcarriers, and pilot subcarriers for channel estimation at a signal receiver, each pilot subcarrier being free of communication information, and controlling optical power of the pilot subcarriers to vary with optical frequencies of the pilot subcarriers so that optical power of a pilot subcarrier at a high optical frequency is different from optical power of another pilot subcarrier at a low optical frequency.
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