4개의 송신안테나를 사용하는 차등 시공간 변조에 대한 새로운 준직교 차등 복조기법
New Quasi-orthogonal Differential Detection Method for Differential Space-Time Modulation with 4 Transmit Antennas
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초록
본 논문은 4개의 송신안테나를 사용하는 QO-STBC(Quasi-Orthogonal Space-Time Block Code)를 기반으로한 준직교 DSTM(Differential Space-Time Modulation)에 대한 새로운 준직교 차등 복조기법을 제안한다. 제안된복조기법은 준직교 DSTM에 대한 기존의 준직교 차등 복조기법처럼 2개의 송신 심벌 쌍을 각각 독립적으로 복호할 수있어 ML(Maximum Likelihood) 복호에 비해 수신단 복호복잡도를 크게 낮출 수 있다. 더욱이 제안된 복조기법은기존의 준직교 복조기법에 비해 고려된 모든 변조방식에서 성능 향상을 보여주며 또한 ML 복호에 비해 4-QAM에서는 거의 동일한 성능과 16-QAM에서는 약 0.5dB 이내의 성능을 보여준다.
Abstract
In this paper, we propose a new quasi-orthogonal differential detection method for Differential Space-Time Modulation (DSTM) based on Quasi-Orthogonal Space-Time Block Code (QO-STBC) with 4 transmit antennas. Because the proposed detection can independently decode two transmitted symbol pairs like conventional quasiorthogonal differential detection, it dramatically reduces the decoding complexity compared to Maximum Likelihood (ML) detector. Computer simulation results show the proposed detection exhibits improved average error performance compared to the conventional quasi-orthogonal differential detection with 4-QAM, 16-QAM. And, compared with ML detector, the new detection shows almost the same performance for 4-QAM and within 0.5dB for 16-QAM, respectively.
참고문헌 (13)
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