Composite BPSK/AM-BPSK based spectral suppression of out-of-band energy from saturated RF amplifier
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United States of America Patent
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Apr 13, 2004
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app pub date -
Nov 9, 1999
filing date -
Nov 9, 1998
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Abstract
An amplitude modulation (AM) based mechanism controllably alters the shape of a binary phase shift keyed (BPSK) digital spreading waveform modulated onto an RF carrier. The modulated RF carrier is amplified by a saturated RF amplifier. The spectral properties of the amplified AM-BPSK waveform, when combined with the spectral properties of a BPSK waveform modulated onto the RF carrier and amplified by another saturated RF amplifier, produces a composite BPSK-modulated RF waveform containing substantially suppressed sidelobes.
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