터보 부호화된 시공간 블록 부호(space-time block coding; STBC) 방식을 사용하는 디지털 통신 시스템에서는 STBC 방식에서 어떻게 연판정 값을 제공하느냐가 터보 부호의 성능과 밀접하게 관련되어 있기 때문에 세심한 주의가 필요하다. 본 논문에서는 이와 같은 시스템의 수신단에서 터보 부호의 복호화기에 들어가는 STBC 복호화기의 출력 값인 연판정 검출(soft decision detection; SDD) 값의 정확도의 정도에 따른 성능을 살펴본다. 최근 유사직교 STBC(quasi-orthogonal STBC; QO-STBC) 방식의 복호 과정에서 발생하는 잡음 향상 효과를 완화시키기 위한 방식으로써 잡음 백색화 필터(noise whitened filter)를 이용한 방식이 제안되어 성능 향상 및 복잡도 개선에 도움이 될 수 있음이 밝혀진 바 있다. 이에 본 논문에서는 이러한 잡음 백색화 필터를 이용한 QO-STBC 방식에 대한 보다 명확한 수학적 분석 결과를 제시하고, 이에 적합한 SDD 방식을 제안한다.
KSP Keywords
Quasi-orthogonal STBC, Soft-decision, Space time(ST), space-time block coding(STBC)
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