System and method for accelerated performance of quadrature...

Details System and method for accelerated performance of quadrature... System and method for accelerated performance of quadrature...

2011-08-16

2011-08-16

Ha, Dac V (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C341S107000, C370S276000, C375S241000, C375S260000, C375S262000, C375S269000, C375S320000, C375S340000, C375S341000, C725S118000

Reexamination Certificate

active

08000402

ABSTRACT:
A system and method for accelerated performance of quadrature amplitude modulation (QAM) is provided. The system includes multiple general purpose registers and multiple execution units configured to decode a set of QAM tones in parallel or an individual QAM tone in response to a single instruction executable by the processor. Each of the plurality of execution units is configured to decode one of the set of QAM tones according to a constellation size associated with the one of the set of QAM tones. The QAM decoding method includes reading a constellation size value for each of a set of received input tones. For each tone in the set of input tones, an ideal point in a QAM constellation of the associated constellation size closest to the X and Y coordinates of the tone is determined. The data values of the ideal points are then stored in a destination register.

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patent: 2003/0145116 (2003-07-01), Moroney et al.
patent: 2007/0033381 (2007-02-01), Wilson

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