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블록호핑 SC-FDMA 시스템을 위한 순환지연 다이버시티의 지연값 결정
임민중(Minjoong Rim) 대한전자공학회 2009 電子工學會論文誌-TC (Telecommunications) Vol.46 No.1
OFDMA 시스템에서는 순환지연 다이버시티는 다이버시티 효과에 의해서 시스템 성능을 증대시킨다. 그러나 블록호핑 SC-FDMA 시스템에서 순환지연 다이버시티의 적용은 다이버시티 효과에 의한 성능 증대효과와, 채널이 주파수 선택적이 됨으로 인한 성능의 감소효과가 동시에 발생한다. 따라서 시스템 성능을 최대화하기 위해서는 순환지연 다이버시티의 지연값을 적절히 선택하는 것이 필요하다. 이 논문에서는 이 두 가지 상반되는 효과와 블록호핑 SC-FDMA 시스템에서 순환지연 다이버시티를 적용할 때 순환지연값을 결정하는 방법에 대해 논의한다. In OFDMA systems, cyclic delay diversity can improve the system performance due to diversity effects. However, applying cyclic delay diversity to block-hopping SC-FDMA systems can affect the performance in two contrary ways: positive effect due to increased frequency diversity and negative effect caused by increased frequency selectivity. Hence, the delay value for cyclic delay diversity should be carefully selected to maximize the system performance. This paper discusses these two contrary effects and proposes a method of determining the delay value of cyclic delay diversity for block-hopping SC-FDMA systems.
Lee, In-Ho,Choi, Hyun-Ho,Lee, Howon Korea Information Processing Society 2017 Journal of information processing systems Vol.13 No.5
For dual-hop multiple-input multiple-output (MIMO) decode-and-forward relaying systems, we propose a selective relaying scheme that uses orthogonal space-time block code (OSTBC) and transmit antenna selection with maximal-ratio combining (TAS/MRC) or vice versa at the first and second hops, respectively. The aim is to achieve an asymptotically identical performance to the dual-hop relaying system with only TAS/MRC, while requiring lower feedback overhead. In particular, we give the selection criteria based on the antenna configurations and the average channel powers for the first and second hops, assuming Rayleigh fading channels. Also, the numerical results are shown for the outage performance comparison between the dual-hop DF relaying systems with the proposed scheme, only TAS/MRC, and only OSTBC.
이인호,최현호,이호원 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.5
For dual-hop multiple-input multiple-output (MIMO) decode-and-forward relaying systems, we propose aselective relaying scheme that uses orthogonal space-time block code (OSTBC) and transmit antennaselection with maximal-ratio combining (TAS/MRC) or vice versa at the first and second hops, respectively. The aim is to achieve an asymptotically identical performance to the dual-hop relaying system with onlyTAS/MRC, while requiring lower feedback overhead. In particular, we give the selection criteria based on theantenna configurations and the average channel powers for the first and second hops, assuming Rayleighfading channels. Also, the numerical results are shown for the outage performance comparison between thedual-hop DF relaying systems with the proposed scheme, only TAS/MRC, and only OSTBC.
( In-ho Lee ),( Hyun-ho Choi ),( Howon Lee ) 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.5
For dual-hop multiple-input multiple-output (MIMO) decode-and-forward relaying systems, we propose a selective relaying scheme that uses orthogonal space-time block code (OSTBC) and transmit antenna selection with maximal-ratio combining (TAS/MRC) or vice versa at the first and second hops, respectively. The aim is to achieve an asymptotically identical performance to the dual-hop relaying system with only TAS/MRC, while requiring lower feedback overhead. In particular, we give the selection criteria based on the antenna configurations and the average channel powers for the first and second hops, assuming Rayleigh fading channels. Also, the numerical results are shown for the outage performance comparison between the dual-hop DF relaying systems with the proposed scheme, only TAS/MRC, and only OSTBC.
Imperative Constructions in English
조기석 한국영어학회 2009 영어학 Vol.9 No.2
The purpose of this article is to discuss imperative constructions in English and show that imperative constructions are formed by force lowering. The force lowering process is a movement of force feature to verbal predicates. It requires adjacency between Comp and the verbal predicates that bear the force feature. The force lowering approach to imperative constructions will explain why negative imperative sentences such as not cheat in the exam are not acceptable, whereas don't cheat in the exam or somewhat archaic cheat not in the exam are possible imperative sentences.