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Design of Cic roll-off Compensation Filter in Digital Receiver For W-CDMA NODE-B  

김성도 (에이스테크놀로지 신규사업팀)
최승원 (한양대학교 전자통신전파공학과)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.40, no.12, 2003 , pp. 155-160 More about this Journal
Abstract
Owing to the advances in ADC and DSP technologies, signals in If band, which once had to be processed in analog technology, can new be digitally processed. This is referred to as "Digital IF" or "Digital Radio", which is a preliminary stage of SDR. Applying the digital radio technology to a multi-carrier receiver design, a processing gain is generated through an over-sampling of input data. In the digital receiver, decimation is performed for reducing the computational complexity CIC and half band filter is used together with the decimation as an anti-alising filter. The CIC filter, however, should introduce the roll-off phenomenon in the passband, which causes the receiving performance to be considerably degraded due to the distorted Passband flatness of receiving filter. In this paper, we designed a CIC roll-off compensation filter for W-CDMA digital receiver. The performance of the proposed compensation filter is confirmed through computer simulations in such a way that the BER is minimized by compensating the roll-off characteristics.off characteristics.
Keywords
W-CDMA; CIC filter; Roll-off; pulse Shaping Filter; ADC;
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