Design of CIC roll-off compensation filter in a W-CDMA digital IF receiver |
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| Authors: | Seongdo Weon-Cheol Sungsoo Seungwon |
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| Affiliation: | aAdvanced R&D Team, Ace Technology, South Korea;bDepartment of Information and Communications, Yong-in Songdam College, South Korea;cDepartment of Information and Communications, Myoungji College, South Korea;dDivision of Electrical and Computer Engineering, Hanyang University, 17 Haengdang-Dong, Seongdong-Gu, Seoul 133-791, South Korea |
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| Abstract: | In a digital intermediate frequency (IF) receiver, decimation is performed to reduce the computational complexity and cascaded integrated comb (CIC) filter is used together with the decimation as an anti-aliasing filter. However, the CIC filter generates the roll-off phenomenon in the pass-band, which causes the receiving performance to be considerably degraded due to the distorted pass-band flatness of the receiving filter. In this paper, we propose a design method of the CIC roll-off compensation filter to reduce the performance degradation due to the roll-off characteristics of the CIC filter for a W-CDMA digital IF receiver. The performance of the proposed CIC roll-off compensation filter is confirmed through computer simulation in such a way that bit error rate (BER) is minimized by compensating the roll-off characteristics. In addition, the proposed method can be used in the design of a digital-to-analog (DAC) compensation filter and interpolator in the transmitter. |
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| Keywords: | CIC filter Roll-off Decimation W-CDMA |
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