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학술지 Simplified Log Likelihood Ratio Calculation in Soft Ordered Successive Interference Cancellation for Multiple-Input Multiple-Output Digital Video Broadcasting-Second Generation Terrestrial Receivers
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강인웅, 이영준, 김영민, 서재현, 김흥묵, 김형남
IET Communications, v.8 no.18, pp.3280-3289
14MR9500, (통합)초고품질 콘텐츠 지원 UHD실감 방송/디지털 시네마/사이니지 융합서비스 기술 개발, 김진웅
This study proposes a soft ordered successive interference cancellation (OSIC) receiver accompanied by a simplified log-likelihood ratio calculation method for a dual-polarised multiple-input multiple-output (MIMO) digital video broadcastingsecond generation terrestrial system. The future terrestrial transmission systems will be required to provide high data rates for ultra-high definition television service. For this purpose, dual-polarised MIMO techniques with a little cross-antenna interference and high-order modulation schemes have been considered. As the cross-antenna interference needs to be removed, a soft OSIC receiver can be used effectively. However, the receiver has to endure high computational complexity for calculating soft values. To reduce it, the authors simplified the calculation based on the decision threshold (DT) method. The main contribution of this study is to extend the conventional DT method, which is restricted to only low-order modulations, to an algorithmic process applicable to any modulation order. The proposed soft OSIC receiver has about 1 dB degradation from the soft OSIC receiver with the maximum-likelihood calculation of soft values. The degradation can be fully rewarded by the significantly reduced computational complexity. Furthermore, this study presents an additional possibility of improving the decoding performance by modelling the OSIC equaliser as a biased estimator.
KSP 제안 키워드
Computational complexity, DT method, Digital video broadcasting, High data rate, High definition television(HDTV), High order modulation, Modulation order, Modulation scheme, Multiple input multiple output(MIMO), Ordered successive interference cancellation, Second generation(2G)