Decimation filtering apparatus and method
A technology of decimation filtering and decimation filter, which is applied in the direction of impedance network, analog-to-digital converter, digital technology network, etc., and can solve problems such as difficult to realize manufacturing devices
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[0117] For IS-95, the desired sampling frequency is Fs=49.152Msps, which is 40 times the chip rate of 1.2288M chips per second. Assuming that the desired output rate of the PFIR filter 57 is twice this chip rate, it is set to D=20. The passband and stopband specifications of the overall decimation filter are determined from the passband and stopband specifications of commercially available analog IF filters being used in IS-95 systems. Specifically, the filter disclosed by Sawket Company's 97 annual data sheet No. 854550-1 (Part Number 854550-1 Data Sheet, Sawket Inc., 1997) is considered to have the following technical indicators:
[0118] Passband edge: 630kHz from carrier
[0119] Pass band ripple: 0.7dB...(19)
[0120] Stopband: 35dB attenuation at 750kHz from carrier
[0121] 50dB attenuation at 900kHz from carrier
[0122] In normalized frequency, the technical indicators are:
[0123] Passband: f ∈ [0, 0.0128]
[0124] Stopband: f ∈ [0.0153, 0.5]...(20)
[0125] ...
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