국내외적인 이동멀티미디어 방송 시장의 급속한 성장과 더불어 동일한 주파수 대역에서 기존 T-DMB 시스템에 비해 더 많은 데이터 전송률을 얻기 위해, T-DMB 시스템에 계층변조를 적용하여 전송률을 높이는 연구가 국내외적으로 추진되고 있다. 기존 T-DMB 시스템의 DQPSK 신호에 새로운 변조방식으로 변조된 신호를 더하여 계층변조 하는 경우에, 새로 추가되는 신호에는 한 개 이상의 변조방식이 적용될 수 있다. 이러한 경우의 일례는 DQPSK-BPSK 및 DQPSK-QPSK 변조가 있을 수 있다. 이와 같이 새로 추가되는 신호에 한 개 이상의 변조방식이 적용된 경우에, 수신단에서 새로 추가된 신호에 적용된 변조방식을 용이하게 검출하기 위한 수단이 필요하다. 이것을 위하여 PRS 신호에 PN 시퀀스를 계층변조 형태로 추가하여 수신단에서 PN 시퀀스의 상관을 취하여 새로 추가되는 신호의 변조방식을 검출하는 방법을 제안하고, 실험 결과를 제시한다.
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