본 논문은 전력선통신이 다른 무선통신과 간섭 없이 사용주파수를 공유해서 효율적으로 이루어질 수 있는 Wave Digital Filter(WDF)를 제안하였다. 이 필터는 Elliptic 필터를 이용하여 아날로그 하프밴드 필터를 설계하고 만들어진 아날로그 하프밴드 필터에서 디지털로 변환할 때 Bilinear방법을 이용하여 설계하였다. Windowed OFDM방식의 전력선 모뎀에서 이 필터를 사용하면 깊은 노치를 얻을 수 있으며 CIC(Cascaded Integrator Comb) 필터 등과 같은 다른 디지털 필터의 단점인 저지대역의 특성이 좋지 않고, 통과 대역에서의 처짐(Droop)현상으로 인해 원래 신호가 왜곡되는 현상을 보상해 주기 때문에 노치로 인한 스펙트럼 비효율성을 최소화하여 통신 성능을 향상시킨다.
KSP Keywords
notch filter, wave digital filter
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