• Title/Summary/Keyword: block codes

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Development of a Real-Time Control System for Rapid Prototyping (Rapid Prototyping을 위한 실시간 제어시스템 개발에 관한 연구)

  • Kang, Moon-Ho;Jeong, Kyung-Min;Park, Yoon-Chang
    • Proceedings of the KIEE Conference
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    • 1999.07b
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    • pp.927-929
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    • 1999
  • In this research a real-time control system was developed without program codings during control system designing procedures. On the Simulink window control system is designed in the form of block diagrams, program codes are produced automatically with the real time workshop package, then C-compiler compiles the program codes. With this automatic real-time program producing mechanism rapid prototyping is realized. To show effectiveness of the proposed system designing scheme a DSP-based DC motor speed control system was constructed and PI and Fuzzy control methods were implemented.

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A Development on Induction Motor Drive Simulator using MATLAB Simulink (MATLAB Simulink를 이용한 유도전동기 구동 시뮬레이터 개발)

  • O Won-hyun;Kang Ho-Jin;Kim Jong-Sun;Shin Eun-Chul;Yoo Ji-Yoon;Kim Sung-Hwan;Park Tae-Sik
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.217-221
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    • 2002
  • In this research a Matlab/Simulink/RTW - based on the realtime control system was developed for an induction motor vector control. On the Simulink window, the control system is designed In the form of block diagrams, program codes are produced automatically with the RTW(Real Time Workshop), then a DSP c compiler complies the program codes.

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Soft-Decision-and-Forward Protocol for Cooperative Communication Networks with Multiple Antennas

  • Yang, Jae-Dong;Song, Kyoung-Young;No, Jong-Seon;Shin, Dong-Joan
    • Journal of Communications and Networks
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    • v.13 no.3
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    • pp.257-265
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    • 2011
  • In this paper, a cooperative relaying protocol called soft-decision-and-forward (SDF) with multiple antennas in each node is introduced. SDF protocol exploits the soft decision source symbol values from the received signal at the relay node. For orthogonal transmission (OT), orthogonal codes including Alamouti code are used and for non-orthogonal transmission (NT), distributed space-time codes are designed by using a quasi-orthogonal space-time block code. The optimal maximum likelihood (ML) decoders for the proposed protocol with low decoding complexity are proposed. For OT, the ML decoders are derived as symbolwise decoders while for NT, the ML decoders are derived as pairwise decoders. It can be seen through simulations that SDF protocol outperforms AF protocol for both OT and NT.

Development of a Simulink/RTW-Based Realtime Control System for an Induction Motor Vector Control (유도전동기 벡터제어를 위한 Simulink/RTW 기반 실시간 제어시스템 개발)

  • Kang, Moon-Ho
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.50 no.3
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    • pp.136-142
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    • 2001
  • In this research a Simulink/RTW-baed realtime control system was developed for an induction motor vector control. On the Simulink window, the control system is designed in the form of block diagrams, program codes are produced automatically with the RTW(Real Time Workshop), then an DSP c compiler compiles the program codes. With this automatic program producing method rapid prototyping is realized with the least time-consuming manual programming procedures. To show effectiveness of the proposed system designing scheme a DSP-based induction motor vector controller was constructed and implemented.

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Logic gate implementation of constant amplitude coded CS/CDMA transmitter (정포락선 부호화된 CS-CDMA 송신기의 논리 게이트를 이용한 구현)

  • 김성필;류형직;김명진;오종갑
    • Proceedings of the IEEK Conference
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    • 2003.11c
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    • pp.281-284
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    • 2003
  • Multi-code CDMA is an appropriate scheme for transmitting high rate data. However, dynamic range of the signal is large, and power amplifier with good linearity is required. Code select CDMA (CS/CDMA) is a variation of multi-code CDMA scheme that ensures constant amplitude transmission. In CS/CDMA input data selects multiple orthogonal codes, and sum of these selected codes are MPSK modulated to convert multi-level symbol into different carrier phases. CS/CDMA system employs level clipping to limit the number of levels at the output symbol to avoid hish density of signal constellation. In our previous work we showed that by encoding input data of CS/CDMA amplitude of the output symbol can be made constant. With this coding scheme, level clipping is not necessary and the output signal can be BPSK modulated for transmission. In this paper we show that the constant amplitude coded(CA-) CS/CDMA transmitter can be implemented using only logic gates, and the hardware complexity is very low. In the proposed transmitter architecture there is no apparent redundant encoder block which plays a major role in the constant amplitude coded CS/CDMA.

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Development of a Real Time Control System Using Simulink/RTW (Simulink/RTW를 이용한 실시간 제어시스템 개발)

  • Kang, Moon-Ho;Jeong, Dae-Yeon
    • Proceedings of the KIEE Conference
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    • 2000.07d
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    • pp.2392-2394
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    • 2000
  • In this research a real time control system was developed without program codings during control system designing procedures. On the Simulink window control system is designed in the form of block diagrams, program codes are produced automatically with the real time workshop package(RTW), then c compiler compiles the program codes. With this automatic real time program producing mechanism rapid prototyping is realized. To show effectiveness of the proposed designing scheme a DSP-based induction motor vector control system was constructed and implemented

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Improved Orthogonal Code Hopping Multiplexing Using Both Division and Hopping

  • Kwon, Jae-Kyun;Park, Su-Won;Sung, Dan-Keun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.3A
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    • pp.277-285
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    • 2008
  • We previously proposed an Orthogonal Code Hopping Multiplexing (OCHM) scheme for statistical multiplexing on a synchronous downlink. OCHM enables a large number of users to share a limited number of code channels through statistical multiplexing. We here improve the performance of OCHM by prioritizing encoded symbols according to their importance using both the conventional code division and the previously proposed code hopping multiplexing schemes. Prioritization is useful for channel coding schemes with different levels of importance for encoded symbols such as turbo-codes. Scheme performance is evaluated by simulation in terms of the required Eb/N0 for a 1% block error rate.

Power analysis attack resilient block cipher implementation based on 1-of-4 data encoding

  • Shanmugham, Shanthi Rekha;Paramasivam, Saravanan
    • ETRI Journal
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    • v.43 no.4
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    • pp.746-757
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    • 2021
  • Side-channel attacks pose an inevitable challenge to the implementation of cryptographic algorithms, and it is important to mitigate them. This work identifies a novel data encoding technique based on 1-of-4 codes to resist differential power analysis attacks, which is the most investigated category of side-channel attacks. The four code words of the 1-of-4 codes, namely (0001, 0010, 1000, and 0100), are split into two sets: set-0 and set-1. Using a select signal, the data processed in hardware is switched between the two encoding sets alternately such that the Hamming weight and Hamming distance are equalized. As a case study, the proposed technique is validated for the NIST standard AES-128 cipher. The proposed technique resists differential power analysis performed using statistical methods, namely correlation, mutual information, difference of means, and Welch's t-test based on the Hamming weight and distance models. The experimental results show that the proposed countermeasure has an area overhead of 2.3× with no performance degradation comparatively.

Concatenated Coding System for an Effective Error Correction (효율적인 에러 정정을 위한 콘케티네이티드 코팅 시스템)

  • Kang, Beob Joo;Kang, Chang Eon
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.23 no.3
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    • pp.309-316
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    • 1986
  • A concatenated coding system using a binary code as the inner code and a nonbinary code as the outer code has been constructed for the purpose of error correction. The complexity of a conventional coding system grows exponentially as the code length of a block code becomes longer. To reduce the complexity for ling code, an effective communication system has been proposed by cascading two codes-binary and norbinary codes. Using a parallel-to-serial circuit and a serial-to-parallel circuit, the concatenated coding system has been designed and constructed by empolying a (7,3) burst error correcting code as the inner code and a (7,3) Reed-Solomon code as the outer code. This system has been simulated and tested using a micro-computer. For the (49,9) concatenated coding system, the error probability of the channel has been evaluated and compared to different coding systems.

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Block Unit to Present Panoramic View in 3D Map (3차원 지도에서 파노라마 전경 표현을 위한 단위 블록 디자인에 관한 연구)

  • Kim, Sung-Kon
    • Science of Emotion and Sensibility
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    • v.12 no.1
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    • pp.137-144
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    • 2009
  • This study aims to develop a 3D map which allows users to better understand the overall topography and to memorize the general concepts of the current location for tourists. The Map also utilizes different forms and color codes of the block units in the panoramic view. First, in preparation for making the road block unit, 28 types of roads presented in common map were defined. Based on the definitions, 12 dominant groups were formed. In designing each form, visual correlation was considered. Second, 42 types of terrain features presented in normal maps were defined for making the panoramic block unit. Then, 2 dominant groups, each contains 5 subgroups, were made according to the assemble pattern and the size of area. On the basis of the grouped units, the panoramic block units were produced with 3D pole line graphics maintaining integration. Lastly, each panoramic block units were categorized by color classes such as blue, green, gray and brown class. The overall color combination of the work was evaluated as well harmonized since the Moon&Spencer's Aesthetic measure value exceeds 0.5.

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