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CDMA시스템에서 지연 시간을 향상시킨 순차적 간섭 제거기에 관한 연구
최병구,박용완,Choe, Byeong-Gu,Park, Yong-Wan 대한전자공학회 2000 電子工學會論文誌-TC (Telecommunications) Vol.37 No.7
본 논문에서는 CDMA 시스템에서 다중 사용자 검출을 위해 수신신호를 나누는 개념과 순차적 간섭 제거기를 조합한 새로운 간섭 제거기를 제안한다. 본 간섭 제거기에서 수신신호를 첫 번째 그룹의 입력 신호로 이용하며, m개의 그룹들을 통과해서 m개의 그룹 출력 신호들은 만들어진다. e번째 그룹의 출력 신호를 제외한 모든 그룹의 출력 신호들은 더해져서 수신신호로부터 제거되고 그로부터 얻어지는 신호는 번째 순차적 간섭 제거기의 입력 신호로 이용된다. 컴퓨터 시뮬레이션 및 구조분석을 통해서 향상된 순차적 간섭 제거기가 비트 오율과 복잡성의 면에서 순차적 간섭 제거기의 성능을 유지시키는 동시에 순차적 간섭 제거기의 지연시간에 대한 단점을 향상시킴을 보여준다. In this paper, we introduce a modified interference cancellation scheme for multiuser detection in CDMA(Code Division Multiple Access). This detector uses SIC(Successive Interference Canceller) scheme and divides the received signals to reduce the delay time. In this proposed structure, the active users are divided into a number of groups. Within each group, parallel detection is performed to estimate the output signal of that group. The estimated output signal due to that group is then subtracted from the received signal and the resulting residual signal is used for the parallel detection of the next group. This parallel and serial cancellation process is repeated until the last group in the stage is completed. The estimated output signals due to all groups except -th group are MAI for the user signals in -th group. Therefore, the estimated output signals due to all groups except th group are subtracted from the received signal, and then the obtained signal becomes the input signal of -th SIC. The proposed RDSIC (Reduced Delay time of Successive Interference Canceller) has performance and complexity close to the SIC, but with much less detection delay.
수목의 근계구성에 따른 사면의 붕괴방지효과에 관한 연구(4) - 잣나무 뿌리의 인장특성 -
지병윤 ( Ji Byeong Yun ),오재헌 ( O Jae Heon ),최병구 ( Choe Byeong Gu ),전근우 ( Jeon Geun U ),차두송 ( Cha Du Song ) 한국산림과학회 2004 한국산림과학회지 Vol.93 No.1
In order to quantify the increased soil reinforcement by tensile strength of roots, tensile force and strength of Korea pine roots were measured and analyzed. Samples are selected along their live positioning depth and tested in root diameter from 1.4 to 12.7㎜ . Tensile force of Korean pine roots was proportional to the power of root diameter. Variance of tensile force was decreased as the soil depth was increased. The tensile strength of Korean pine roots were distributed from 30.17kgf/㎠` to 457.67kgf/㎠ by root diameter, and their average value was 111.00kgf/㎠. The tensile strength of Korean pine roots was also decreased as soil depth was increased.