• Title/Summary/Keyword: performance point

Search Result 6,738, Processing Time 0.033 seconds

Lattice Reduction-aided Detection with Out-of-Constellation Point Correction for MIMO Systems (MIMO 시스템을 위한 Out-of-Constellation Point 보정 Lattice Reduction-aided 검출기법)

  • Choi, Kwon-Hue
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.32 no.12A
    • /
    • pp.1339-1345
    • /
    • 2007
  • An important drawback in Lattice Reduction (LR) aided detectors has been investigated. For the solution, an improved LR aided detection with ignorable complexity overhead is proposed for MIMO system, where the additional correction operation is performed for the case of unreliable symbol decision. We found that LR aided detection errors mainly occur when the lattice points after the inverse lattice transform in the final step fall outside the constellation point set. In the proposed scheme, we check whether or not the lattice point obtained through LR detection is out of constellation. Only for the case of out of constellation, we additionally perform ML search with reduced search region restricted to the neighboring points near to the obtained lattice points. Using this approach, we can effectively and significantly improve the detection performance with just a slight complexity overhead which is negligible compared to full searched ML scheme. Simulation results show that the proposed scheme achieves the detection performance near to that of the ML detection with a lower computational complexity.

Fixed-point Implementation for Downlink Traffic Channel of IEEE 802.16e OFDMA TDD System (IEEE 802.16e OFDMA TDD 시스템 하향링크 트래픽 채널의 Fixed-point 구현 방법론)

  • Kim Kyoo-Hyun;Sun Tae-Hyung;Wang Yu-Peng;Chang Kyung-Hi;Park Hyung-Il;Eo Ik-Soo
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.31 no.6A
    • /
    • pp.593-602
    • /
    • 2006
  • This paper propose to methodology for deciding suitable bit size that minimizes hardware complexity and performance degradation from floating-point design the fixed-point implementation of downlink traffic channel of IEEE 802.16e OFDMA TDD system. One of the major considering issues for implementing fixed-point design is to select Saturation or Quantization properly with the knowledge of signal distribution by pdf or histogram. Also, through trial and error, we should execute exhaustive computer simulation for various bit sizes, hence obtain appropriate bit size while minimizing performance degradation. We carry out computer simulation to decide the optimized bit size of downlink traffic channel under AWGN and ITU-R M.1225 Veh-A channel model.

A Design of High Throughput 512-point FFT Processor (고성능 512-point FFT 프로세서의 설계)

  • 김선호;김정우;오길남;김기철
    • Proceedings of the Korean Society of Broadcast Engineers Conference
    • /
    • 1999.11b
    • /
    • pp.255-260
    • /
    • 1999
  • This paper shows the design of a high throughput 512-point FFT processor. The performance target of the 512-point FFT processor is to achieve data symbol rate required for OFDM systems. The memory requirement of the 512-point FFT processor is minimized by adopting shuffle memory system. The hardware cost of the 512-point in processor is further reduced by using a complex multiplier with a new strength reduction method.

  • PDF

Fixed-point optimization utility for digital signal processing programs (디지탈 신호처리용 고정 소수점 최적화 유틸리티)

  • 김시현;성원용
    • Journal of the Korean Institute of Telematics and Electronics C
    • /
    • v.34C no.9
    • /
    • pp.33-42
    • /
    • 1997
  • Fixed-point optimization utility software that can aid scaling and wordlength determination of digital signal processign algorithms written in C or C$\^$++/ language is developed. This utility consists of two programs: the range estimator and the fixed-point simulator. The former estimates the ranges of floating-point variables for automatic scaling purpose, and the latter translates floating-point programs into fixed-point equivalents for evaluating te fixed-point performance by simulation. By exploiting the operator overloading characteristics of C$\^$++/ language, the range estimation and the fixed-point simulation can be conducted just by modifying the variable declaration of the original program. This utility is easily applicable to nearly all types of digital signal processing programs including non-linear, time-varying, multi-rate, and multi-dimensional signal processing algorithms. In addition, this software can be used for comparing the fixed-point characteristics of different implementation architectures.

  • PDF

Performance Analysis of a Solid Oxide Fuel Cell/Micro Gas Turbine Hybrid System (고체산화물 연료전지/마이크로 가스터빈 하이브리드 시스템의 성능 해석)

  • Yang, Jin-Sik;Song, Tae-Won;Kim, Jae-Hoon;Sohn, Jeong-Lak;Ro, Sung-Tack
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2005.06a
    • /
    • pp.273-276
    • /
    • 2005
  • Performance analysis of a solid oxide fuel cell/micro gas turbine hybrid system is conducted at design-point and part-load conditions and its results are discussed in this study. With detailed considerations of the heat and mass transfer phenomena along various flow streams of the SOFC, the analysis based on a quasi-2D model reasonably predicts its performance at the design-point operating conditions. In case of part-load operations, performance of the hybrid system to three different operation modes(fuel only control, speed control, and VIGV control) is compared. It is found that the simultaneous control of both supplied fuel and air to the system with a variable MGT rotational speed mode is the optimum choice for the high performance operation. And then, the dynamic characteristics of a solid oxide fuel cell are briefly introduced.

  • PDF

Experimental Study on the Aerodynamic Performance Characteristics of a Small-Size Axial Fan with the Different Depths of Bellmouth (벨마우스 깊이가 다른 소형축류홴의 공력특성에 대한 실험적 연구)

  • Kim, Jang-Kweon;Oh, Seok-Hyung
    • Journal of Power System Engineering
    • /
    • v.17 no.6
    • /
    • pp.73-78
    • /
    • 2013
  • A Small-size axial fan(SSAF) has widely been utilized to circulate a cooling air in a refrigerator, etc. Generally, the aerodynamic performance of SSAF is strongly dependent upon the depth between SSAF and bellmouth, and it includes axial, partially stalled, mostly stalled and radial flow regions according to the flow coefficient. In this study, four kinds of bellmouth depths were considered to analyze the aerodynamic performance of SSAF. As a bellmouth depth increases, a maximum flowrate decreases, but a maximum static pressure increases. Also, stall region includes an inflection point in all aerodynamic performance curves. Finally, a static pressure efficiency shows the maximum value of 37%.

Implementation of Management performance Analysis System with KDD (KDD에 기반한 경영성과 분석 시스템 구현)

  • An, Dong-Gyu;Jo, Seong-Hun
    • 한국디지털정책학회:학술대회논문집
    • /
    • 2004.05a
    • /
    • pp.575-592
    • /
    • 2004
  • In modern dynamic management environment, there is growing recognition that? information & knowledge management systems are essential for CEO's efficient/effective decision making. As a key component to cope with this current, we suggest the management performance analysis syystem based on Knowledge Discovery in Database (KDD). The system measures management performance that is considered with both VA(Value- Added), which represents stakeholder's point of view and EVA(Economic Value-Added), which represents shareholder's point of view. The relation ship between management performance and some 80 financial ratios is analyzed, and then important financial ratios are drawn out. In analyzing the relationship, we applied KDD process which includes such as multidimensional cube, OLAP(On-Line Analytic Process), data mining and AHP(Analytic Hierarchy Process). To demonstrate the performance of the system, we conducted a case study using financial data over the 16-years from 1981 to 1996 of Korean automobile industry which is taken from database of KISF AS(Korea Investors Services Financial Analysis System).

  • PDF

Engine Performance Simulation to Evaluate the NOx Reduction of Charge Air Moisturizer System in a Medium Speed Diesel Engine (흡기가습 중형 디젤 엔진의 NOx 저감 평가를 위한 성능 해석 연구)

  • Kim, Ki-Doo;Park, Hyoung-Keun;Kim, Byung-Suck;Ha, Ji-Soo
    • Proceedings of the Korean Society of Marine Engineers Conference
    • /
    • 2005.11a
    • /
    • pp.15-16
    • /
    • 2005
  • In this study, the characteristics of NOx reduction by using charge air moisturizer system were evaluated by engine performance simulation in medium speed diesel engines. The results of performance simulation were verified by experimental results of single cylinder medium speed diesel engine equipped with charge air moisturizer system. Performance simulation was carried out to evaluate charge air moisturizer system of turbocharged diesel engine, HYUNDAI HiMSEN 9H25/33 engine. Those results show 50% NOx reduction at dew point $80^{\circ}C$ and charge air pressure 4bar.

  • PDF

Study on the Business Performance Evaluation with VA and EVA (부가가치와 경제적부가가치를 결합한 경영성과평가에 관한 실증적 연구)

  • 김태성;구일섭;임익성
    • Journal of Korean Society for Quality Management
    • /
    • v.29 no.4
    • /
    • pp.153-160
    • /
    • 2001
  • The proposed system measures business performance by considering both VA(Value-Added), which represents stakeholder's point of view and EVA(Economic Value-Added), which represents shareholder's point of view. To do so, we suggest a business performance scheme which utilizes VA per Capita (Value- Added/Workers) and EVA to Invested Capital(Economic Value-Added /Invested Capital). For effective measurement of business performance, we consider simultaneously not only quantitative financial factors such as VA, EVA and cash flow but also qualitative value drivers such as defect ratio, inventory level, customer satisfaction, enterprise culture and so on. However, we don't consider the qualitative factors due to the limited data. To demonstrate the performance of the system, we conducted a case study using financial data of Korean automobile industry over 16 years from 1981 to 1996, which is taken from database of KISFAS (Korea Investors Services Financial Analysis System).

  • PDF

Implementation of Management performance Analysis System with Genetic Algorithms (Genetic Algorithm에 기반한 경영성과분석 시스템 구현)

  • An, Dong-Gyu;Jo, Seong-Hun
    • 한국디지털정책학회:학술대회논문집
    • /
    • 2003.12a
    • /
    • pp.191-210
    • /
    • 2003
  • In modern dynamic management environment, there is growing recognition that information & knowledge management systems are essential for CEO's Efficient/effective decision making, As a key component to cope with this current, we suggest the management performance analysis system based on Knowledge Discovery in Database (KDD). The system measures management performance that is considered with both VA(Value-Added), which represents stakeholder's point of view and EVA(Economic Value-Added), which represents shareholder's point of view, The relationship between management performance and some 80 financial ratios is analyzed, and then important financial ratios are drawn out. In analyzing the relationship, we applied KDD process which includes such as multidimensional cube, OLAP(On -Line Analytic Process), data mining and AHP(Analytic Hierarchy Process). To demonstrate the performance of the system, we conducted a case study using financial data over the 16-years from 1981 to 1996 of Korean automobile industry which is taken from database of KISFAS(Korea Investors Services Financial Analysis System).

  • PDF