본 논문에서는 ATSC 지상파 디지털TV 방송신호를 중계하는 EDOCR 시스템에서 송수신신호의 주파수 동기를 위해 제안된 알고리즘에 대해 기술한다. 또한 수학적 등가모델을 사용하여 제안 알고리즘을 검증하고 제안 알고리즘을 적용한 EDOCR시스템의 성능을 분석하였다. 제안하는 알고리즘은 주 송신신호의 동기복원 과정에서 획득한 주파수 오차정보를 재 변조 과정에 사용함으로써 GPS와 같은 별도의 부가 장치 없이 송수신신호의 주파수를 일치시킬 수 있고, ATSC 송신신호 규격을 만족시키는 재전송신호를 발생시킬 수 있다.
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