Data processing: structural design – modeling – simulation – and em – Modeling by mathematical expression
Reexamination Certificate
2006-01-31
2006-01-31
Phan, Thai (Department: 2128)
Data processing: structural design, modeling, simulation, and em
Modeling by mathematical expression
C703S013000, C708S300000, C455S422100
Reexamination Certificate
active
06993464
ABSTRACT:
The present invention discloses a method for finding an optimized filter parameters design to meet input specifications and hardware constraints in accordance with a typical single channel digital IF programmable downconverter. Said typical single channel digital IF programmable downconverter comprises four stages, including a high speed down-sampling stage, a spectral shaping stage, a rate matching stage and an oversampling stage. According to input specifications, said method firstly determines a number of Halfband interpolation filters used in said oversampling stage, secondly obtains optimized parameters for a CIC decimation filter and a Halfband decimation filter in said high speed down-sampling stage, using as many Halfband decimation filters as possible. Then determine if it is necessary to use re-sampling FIR filter for rate matching. Finally, use various function window to design programmable FIR filter for spectral shaping, obtains an overall synthesized spectral response which meets input specifications.
REFERENCES:
patent: 6279019 (2001-08-01), Oh et al.
patent: 6289487 (2001-09-01), Hessel et al.
patent: 6611855 (2003-08-01), Hellberg et al.
patent: 2004/0203709 (2004-10-01), Luneau
Chen Chiung-Jang
Chiu Che-Sheng
Hsieh Su-Chin
Tang Kai-An
Chunghwa Telecom Co. Ltd.
Phan Thai
Rabin & Berdo P.C.
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