• Title/Summary/Keyword: Iterative Scheme

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Noncooperative Multimode Precoding with Limited Feedback in MIMO Interference Channels

  • Lee, Jong-Ho
    • ETRI Journal
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    • 제34권5호
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    • pp.763-766
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    • 2012
  • This letter proposes an iterative multimode precoding scheme with limited feedback for nonreciprocal MIMO interference channels. Based on analysis of game theory, we model the iterative multimode precoding as a noncooperative game with a finite set of strategies. Numerical results are presented to verify the sum rate performance of the proposed scheme.

경계요소법을 이용한 경계에 직교하는 삼차원 격자형성법 (Three-Dimensional Grid Generation Method for an Orthogonal Grid at the Boundary by Using Boundary Element Method)

  • 정희권;권장혁
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 1995년도 추계 학술대회논문집
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    • pp.82-89
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    • 1995
  • In the present paper, a method of nearly orthogonal grid generation in an arbitrary simply-connected 3D domain will be presented. The method is a new direct and non-iterative scheme based on the concept of the decomposition of the global orthogonal transformation into consecutive mapping of a conformal mapping and an auxiliary orthogonal mapping, which was suggested by King and Leal [4]. In our numerical scheme. Kang and Leal's method is extended from 2D problems to 3D problems while the advantage of the non-iterative algorithm is maintained. The essence of the present mapping method is that an iterative scheme can be avoided by introducing a preliminary step. This preliminary step corresponds to a conformal map and is based on the boundary element method(BEM). This scheme is applied to generate several nearly-orthogonal grid systems which are orthogonal at boundaries.

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APPROXIMATING COMMON FIXED POINTS OF ONE-STEP ITERATIVE SCHEME WITH ERROR FOR NON-SELF ASYMPTOTICALLY NONEXPANSIVE IN THE INTERMEDIATE SENSE MAPPINGS

  • Saluja, Gurucharan Singh;Nashine, Hemant Kumar
    • East Asian mathematical journal
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    • 제26권3호
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    • pp.429-440
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    • 2010
  • In this paper, we study a new one-step iterative scheme with error for approximating common fixed points of non-self asymptotically nonexpansive in the intermediate sense mappings in uniformly convex Banach spaces. Also we have proved weak and strong convergence theorems for above said scheme. The results obtained in this paper extend and improve the recent ones, announced by Zhou et al. [27] and many others.

A Simple Method to Reduce the Splitting Error in the LOD-FDTD Method

  • Kong, Ki-Bok;Jeong, Myung-Hun;Lee, Hyung-Soo;Park, Seong-Ook
    • Journal of electromagnetic engineering and science
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    • 제9권1호
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    • pp.12-16
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    • 2009
  • This paper presents a new iterative locally one-dimensional [mite-difference time-domain(LOD-FDTD) method that has a simpler formula than the original iterative LOD-FDTD formula[l]. There are fewer arithmetic operations than in the original LOD-FDTD scheme. This leads to a reduction of CPU time compared to the original LOD-FDTD method while the new method exhibits the same numerical accuracy as the iterative ADI-FDTD scheme. The number of arithmetic operations shows that the efficiency of this method has been improved approximately 20 % over the original iterative LOD-FDTD method.

MIMO-OFDM 시스템에서 효율성을 위한 분할 검출 기법 (An Efficient Partial Detection Scheme for MIMO-OFDM Systems)

  • 강성진
    • 한국통신학회논문지
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    • 제40권9호
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    • pp.1722-1724
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    • 2015
  • 본 논문은 MIMO-OFDM 시스템에서 복잡도와 검출 성능의 관점에서 효율성을 위하여, QRD-M과 DFE 및 반복 검출을 통한 분할 검출 기법을 제안한다. 제안된 기법은 공간 스트림에 따라 다른 검출 방법을 사용하여 신호들을 검출한다. 제안된 기법에서 낮은 복잡도를 요구하는 공간 스트림에서는 높은 복잡도와 높은 검출 성능을 가지는 QRD-M을 사용하고 높은 복잡도를 요구하는 공간 스트림에서는 낮은 복잡도와 낮은 검출 성능을 가지는 DFE를 사용한다. 또한 DFE가 사용된 공간 스트림에 대해서는 신뢰성을 보장하기 위해 반복 검출을 수행한다. 시뮬레이션을 통하여, 제안된 기법은 비록 기존의 기법보다 증가된 복잡도를 가지지만, 검출 성능을 월등히 개선시키는 것을 확인하였다.

Performance Analysis of Iterative Detection Scheme for the D-STTD System

  • Yoon, Gil-Sang;Lee, Jeong-Hwan;Cho, In-Sik;Seo, Chang-Woo;Ryoo, Sang-Jin;You, Cheol-Woo;Hwang, In-Tae
    • Journal of information and communication convergence engineering
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    • 제7권2호
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    • pp.235-240
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    • 2009
  • This paper combines various detection techniques and analyzes their performances in detecting the transmission information of the D-STTD scheme that uses, in parallel, the STTD scheme known as the Alamouti code. The D-STTD scheme adopts one of the STTD schemes for transmission to acquire diverse effects and uses another form of STTD for multiplexing effects. Due to the multiplexing effect that transmits different data, it is difficult to apply D-STTD to the conventional STTD combining technique. This paper combines the D-STTD system with linear algorithm, SIC algorithm and OSIC algorithm known as multiplexing detection scheme based on MMSE scheme. And we propose the detection scheme of the D-STTD using MAP algorithm and analyze the performance of each system. The simulation results showed that the detector using iterative algorithm has better performance than Linear MMSE Detector. Especially, we can show that the detector using MAP algorithm outperforms conventional detector.

반복 계산법 및 계산 가속기법에 의한 다물체 동역학 해법 (An Accelerated Iterative Method for the Dynamic Analysis of Multibody Systems)

  • 이기수;임철호
    • 대한기계학회논문집
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    • 제16권5호
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    • pp.899-909
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    • 1992
  • 본 연구에서는 대수 미분 방정식을 풀기위한 새로운 방법을 소개한다. 본 작업에서는 Lagrange multiplier의 값이 사전에 주어졌다고 생각하여, 즉 대수 미분 방정식을 순수한 상미분 방정식으로 변환하여, 잘 알려진 시간 적분법을 적용한다. 또 정확한 Lagrange Multiplier값은 반복 계산법(iterative scheme)에 의하여 계산한 다. 시간 적분의 정확도와 제한 조건의 정확도는 모두 보장된다. 특히 제한 조건 의 경우, 위치, 속도 및 가속도의 제한 조건이 모두 만족된다. 또 정확한 Lagrange multiplier의 값을 계산 가속기법(acceleration technique)에 의하여 대단히 빨리 계 산한다. 독립 좌표를 구할 필요가 없으므로 거대한 행열을 decomposition하는 등의 복잡한 절차가 불필요하며 N-R 반복법 역시 불필요하다. 이러한 사항들 및 Jacobian 행열의 sparsity로 인하여 경제적인 계산이 가능하게 된다.

중첩 부호의 반복 복호를 위한 개선된 클리핑 기법 (Modified Clipping for Iterative Decoding of Superposition Coding)

  • 얀이얼;김정기;진주;이문호
    • 대한전자공학회논문지TC
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    • 제45권2호
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    • pp.44-51
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    • 2008
  • 본 논문에서는 클리핑 설계보다 파워를 덜 잃음으로서 중첩 코딩 시스템의 반복 복호를 위한 수정 클리핑 설계를 제안한다. 중첩코딩 시스템에서 제안한 설계는 특히 저 클리핑율의 경우에서 같은 클리핑 비율로 PAPR과 시스템 성능면에서 좋은 성능을 보였다. 마지막으로 클리핑 잡음 때문에 성능이 열화하는 것을 경감시키기 위해서 [1],[2]에서 제안한 반복 방법으로 SISO 복호알고리즘과 결합된 연 보상 알고리즘을 제안한다. 시뮬레이션 결과들은 제안한 설계로 대다수의 성능 손실이 회복될수 있다는 것을 보였다.

Iterative learning control based on inverse process model

  • Lee, Kwang-Soon
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국제학술편); KOEX, Seoul; 19-21 Oct. 1992
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    • pp.539-544
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    • 1992
  • An iterative lear-rung control scheme is newly designed in tile frequency domain. Purposing for batch process control, a generic form of feedback-assisted first-order learning is considered first, and the inverse model-based learning algorithm is derived through convergence analysis in the frequency domain. To enhance the robustness of the proposed scheme, a filtered version is also presented. Performance of the proposed scheme is evaluated through numerical simulations.

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AN EFFICIENT THIRD ORDER MANN-LIKE FIXED POINT SCHEME

  • Pravin, Singh;Virath, Singh;Shivani, Singh
    • Nonlinear Functional Analysis and Applications
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    • 제27권4호
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    • pp.785-795
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    • 2022
  • In this paper, we introduce a Mann-like three step iteration method and show that it can be used to approximate the fixed point of a weak contraction mapping. Furthermore, we prove that this scheme is equivalent to the Mann iterative scheme. A comparison is made with the other third order iterative methods. Results are presented in a table to support our conclusion.