Method for suppression of OFDM energy spectral density for minimization of out of band emission or utilization of fractured spectrum
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United States of America Patent
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Jan 21, 2014
Grant Date -
Apr 7, 2011
app pub date -
Dec 13, 2010
filing date -
Jul 5, 2006
priority date (Note) -
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Abstract
The Energy spectral density of OFDM signals inherently rolls off slowly. Slow OFDM spectral rolloff has system level implications traditionally mitigated by some combination of the following: addition of bandlimiting filtering; use of significant guard bands of zeroed tones; and, guard time shaping. Each of these techniques negatively impact system performance and/or flexibility. This application presents a methodology for active cancellation of out of band spectral energy. The technique can be used by itself or in conjunction with above traditional methods to help control out of band emission. Examples of the use of the new technique are provided. Computational cost of the new technique is also discussed.
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