Clipping of transmission signal
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United States of America Patent
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Jan 5, 2010
Grant Date -
Jul 13, 2006
app pub date -
Mar 8, 2005
filing date -
Jan 7, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A transmitter clips a transmission signal before transmission in order to reduce the strength of at least one peak of the transmission signal exceeding a predetermined threshold. The transmitter includes a clipper having a minimizer, a filter and an adder. The minimizer minimizes of a cost function with respect to an optimization signal, the cost function having weighted terms as a function of the optimization signal. The terms relate to an effective modulation distortion and an effective overshoot exceeding the predetermined threshold. The filter forms a clipping signal by filtering the optimization signal formed as a result of the minimization according to the spectrum emission mask requirements of the radio system. The adder subtracts the clipping signal from the transmission signal.
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