Acquisition of Weak Signals - Fundamentals of Global Positioning System Receivers: A Software Approach - page 241

Filter A Filter B

Output from filter A

Output from filter B

Signal at frequency f 1

f 1

Frequency
(a) Conventional filter

Filter A Filter B

Output from filter A

Output from filter B

Signal at frequency f 1

f 1

Frequency
(b) FFT filter.

FIGURE 10.7 Filter bank response of conventional and FFT outputs.