OFDM 신호의 PAPR 감소를 위한 PRSC 위치 선택 기법
A PRSC Position Selection Scheme for PAPR Reduction of OFDM Signals
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초록
본 논문에서는 OFDM (Orthogonal Frequency Division Multiplexing) 시스템의 단점인 큰 PAPR (Peak-to-Average Power Ratio)을 감소하기 위한 방식 가운데 하나인 PRSC (PAPR Reduction Sub-Carrier) 기법에서, 송신단에서 수신단으로의 오버헤드 전송이 불필요하며 동시에 우수한 PAPR 감소 성능을 얻을 수 있는 새로운 PRSC 위치 선택 기법을 제안한다. 제안된 기법은 Bit Reversing을 통해 생성된 시작점 및 점증 오프셋을 동시에 적용한 짧은 주기의 십진화된 PN (Pseudo Noise) 부호 기반 시퀀스를 이용하여 PRSC의 위치를 선택한다. 모의실험 결과, 제안 기법은 성능은 우수하나 과도한 오버헤드가 필요한 랜덤 위치 선택 방식과 거의 유사한 매우 우수한 성능을 보임을 확인하였다.
Abstract
For PAPR (Peak-to-Average Power Ratio) reduction in OFDM (Orthogonal Frequency Division Multiplexing) systems using PRSC (PAPR Reduction Sub-Carrier) scheme, we propose a PRSC position selection scheme which requires no overhead from the transmitter to the receiver, while achieving good PAPR reduction performance. The proposed scheme exploits a short-period PN (Pseudo Noise) code based PRSC position selection sequence that is generated by applying starting points determined by bit reversing and gradually-increasing offsets. Simulation results show that the proposed PRSC position selection scheme achieves closely comparable performance of random selection sequence in which excessive overhead is inevitable
참고문헌 (14)
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