System and method for improving signal to quantization noise...

Details System and method for improving signal to quantization noise... System and method for improving signal to quantization noise...

2006-10-17

2010-10-19

Puente, Eva Y (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S261000, C375S147000, C375S343000, C375S140000, C370S208000, C370S203000, C370S206000, C455S446000, C455S449000, C455S422100

Reexamination Certificate

active

07817734

ABSTRACT:
A fixed-point IFFT device in an OFDMA digital modulator is disclosed, which comprises a sub-carrier activity detector configured to detect a number of active sub-carriers in an OFDMA symbol set being transmitted in a given OFDMA symbol period, a scale termination calculator configured to generate an output for determining at which stage to terminate the IFFT scaling as a predetermined function of the number of active sub-carriers, a scaling controller configured to generate a plurality of control signals based on the output of the scale termination calculator, and an IFFT unit having a plurality of scaling stages each of which is controlled by one of the generated control signals.

REFERENCES:
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patent: 2007/0047431 (2007-03-01), Nishio et al.
Ahmad R. S. Bahai et al., “Multi-carrier Digital Communications: Theory and Applications of OFDM”, Second Edition, Springer, Oct. 2004.
Ronald N. Bracewell “The Fourier Transform & Its Applications” Third Edition, Mc Graw-Hill Science, Jun. 1999.

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