Adaptive slicer for a discrete level amplitude modulation receiver
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United States of America Patent
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Dec 2, 2014
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N/A
app pub date -
Mar 8, 2013
filing date -
Sep 19, 2012
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Abstract
In a wireless communication system, an initiator, such as a card reader, can communicate with a target, such as a smart card or other device emulating a smart card, by amplitude modulating a radio frequency signal. In a receiver, levels of samples of a digital baseband signal of the amplitude modulated signal can vary. Apparatus and methods associate a received sample with a hard or sliced output state (such as +1, 0, or −1) and update a value associated with the hard output state for accurate slicing of the samples. This permits the use of hard symbols in further processing rather than soft samples, which can dramatically reduce the complexity of circuitry.
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