Apparatus and method for digital modulation

Details Apparatus and method for digital modulation Apparatus and method for digital modulation

2005-04-27

2008-11-11

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

C375S308000, C375S371000, C375S261000, C375S300000, C375S225000

Reexamination Certificate

active

07450660

ABSTRACT:
A first interpolation section14and a second interpolation section24perform sampling on input data Id4and Qd4having a sampling frequency fover so that resulting data will have a sampling frequency fsamp, which is equal to an operating clock frequency of a digital-to-analog converter, which is an output destination. In the above manner, the data is interpolated. At this time, the first interpolation section14and the second interpolation section24perform interpolation using a frequency ratio between the sampling frequency fover and the sampling frequency fsamp. Then, output data Id5and Qd5having the sampling frequency fsamp is outputted to a quadrature modulation section31.

REFERENCES:
patent: 6144712 (2000-11-01), Samueli et al.
patent: 6381265 (2002-04-01), Hessel et al.
patent: 6504879 (2003-01-01), Iwamatsu
patent: 6546044 (2003-04-01), Dent
patent: 2003/0174784 (2003-09-01), Samarasooriya et al.
patent: 2004/0037366 (2004-02-01), Crawford
patent: 11-163953 (1999-06-01), None

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