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OpenCL을 활용한 CPU와 GPU 에서의 CMMB LDPC 복호기 병렬화
박주열,홍정현,정기석,Park, Joo-Yul,Hong, Jung-Hyun,Chung, Ki-Seok 대한임베디드공학회 2016 대한임베디드공학회논문지 Vol.11 No.6
Recently, Open Computing Language (OpenCL) has been proposed to provide a framework that supports heterogeneous computing platforms. By using an OpenCL framework, digital communication systems can support various protocols in a unified computing environment to achieve both high portability and high performance. This article introduces a parallel software decoder of Low Density Parity Check (LDPC) codes for China Multimedia Mobile Broadcasting (CMMB) on a heterogeneous platform. Each step of LDPC decoding has different parallelization characteristics. In this paper, steps suitable for task-level parallelization are executed on the CPU, and steps suitable for data-level parallelization are processed by the GPU. To improve the performance of the proposed OpenCL kernels for LDPC decoding operations, explicit thread scheduling, loop-unrolling, and effective data transfer techniques are applied. The proposed LDPC decoder achieves high performance by using heterogeneous multi-core processors on a unified computing framework.
SNR 예측 정보 기반 적응형 Modified UMP-BP LDPC 복호기 설계
박주열,조걸,정기석,Park, Joo-Yul,Cho, Keol,Chung, Ki-Seok 대한임베디드공학회 2009 대한임베디드공학회논문지 Vol.4 No.4
As 4G mobile communication systems require high transmission rates with reliability, the need for efficient error correcting code is increasing. In this paper, a novel LDPC (Low Density Parity Check) decoder is introduced. The LDPC code is one of the most popular error correcting codes. In order to improve performance of the LDPC decoder, we use SNR (Signal-to-Noise Ratio) estimation results to adjust coefficients of modified UMP-BP (Uniformly Most Probable Belief Propagation) algorithm which is one of widely-used LDPC decoding algorithms. An advantage of Modified UMP-BP is that it is amenable to implement in hardware. We generate the optimal values by simulation for various SNRs and coefficients, and the values are stored in a look-up table. The proposed decoder decides coefficients of the modified UMP-BP based on SNR information. The simulation results show that the BER (Bit Error Rate) performance of the proposed LDPC decoder is better than an LDPC decoder using a conventional modified UMP-BP.
TMR 구조에서의 백업과 복원을 활용한 안정성 및 신뢰성 향상 임베디드 시스템 구현
박주열(Joo-Yul Park),이준환(Jun-Hwan Lee),김효상(Hyo-Sang Kim),김봉택(Bong-Taek Kim),정기석(Ki-Seok Chung) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The purpose of this paper is to explain the implementation method in order to enhance stability and reliability of embedded system. In this research Texas Instrument (TI)'s TMS570 MCU(Micro Controller Unit) is used to satisfy the standard of stability that is IEC 61508. IEC 61508 suggest SIL(Safety Integrity Level) from 1 to 4 and TMS570 is satisfied SIL3. Also TMS570 can provide several stability functions can be used in realtime system. To use such functions this paper suggest the solution about the defect that can be used in realtime system. In basic way TMR(Triple Modular Redundancy) suggested in addition to explain about the way to improve safety and reliability. Also this paper will suggest the method that reinforce the stability of calculation by using multiplex voter and memory.
박주열(Joo-Yul Park),김효상(Hyo-Sang Kim),이준환(Joon-Hwan Lee),김봉택(Bong-Taek Kim),정기석(Ki-Seok Chung) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
Since the release of safety standard IEC 61508 which defines functional safety of electronic safety-related systems, SIL(Safety Integrity Level) certification for railway systems has gained lots of attention lately. In this paper, we propose a new design technique of the computer board for train control systems with high reliability and safety. The board is designed with TMR(Triple Modular Redundancy) using a certified SIL3 Texas Instrument(TI)’s TMS570 MCU(Micro-Controller Unit) to guarantee safety and reliability. TMR for the control device is implemented on FPGA(Field Programmable Gate Array) which integrates a comparator, a CAN(Controller Area Network) communication module, built-in self-error checking, error discriminant function to improve the reliability of the board. Even if a malfunction of a processing module occurs, the safety control function based on the proposed technique lets the system operate properly by detecting and masking the malfunction. An RTOS (Real Time Operation System) called FreeRTOS is ported on the board so that reliable and stable operation and convenient software development can be provided.
GPU를 이용한 철도신호에서의 LDPC 적용에 관한 연구
박주열(Park Joo-Yul),김효상(Kim Hyo-Sang),김재문(Kim Jae-moon),김봉택(Kim Bong-Taek),정기석(Chung Ki-Seok) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
There have been lots of researches for High Performance Digital Signal Processing performance enhancement on a GPU(Graphic Processor Unit). These kinds of parallelizing can enable massive signal processing, so we can have advantage's of processing various of signal processing standards with GPU. In this paper we introduce Low Density Parity Check(LDPC) which is one of the Foward Error Correction(FEC). And we have achieved computational time reduce by using CUDA as a parallelizing scheme.
박주열(Park Joo-Yul),김효상(Kim Hyo-Sang),박태기(Park Tae-ki),김봉택(Kim Bong-Taek),정기석(Chung Ki-Seok) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
As the railway transportation is getting faster and its operation speed has increased rapidly, its signal control has been complicated. For real time signal processing it is very important to prohibit any critical error from causing the system to malfunction. Today, most of the railroad's controling communications between wayside and train are made in one way. Therefore, by using a forward error correction technique, which receiver can actively correct the signal error, we can increase the performance and the stability of the railroad signaling system. In this paper, we introduce low density parity check(LDPC) that is used by next generation wireless communications and DMB technique. We verified that we can achieve low bit error rate(BER) in high signal to noise ratio(SNR) by using LDPC.
OpenMP를 이용한 철도신호에서의 LDPC 적용에 관한 연구
박주열(Park Joo-Yul),김효상(Kim Hyo-Sang),박태기(Park Tae-ki),김봉택(Kim Bong-Taek),정기석(Chung Ki-Seok) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
There have been lots of researches for High Performance Digital Signal Processing performance enhancement on a multi-core processor. These kinds of parallelizing can enable massive signal processing, so we can have advantage's of processing various of signal processing standards without additional DSP's or other accelerating hardwares. In this paper we introduce Low Density Parity Check(LDPC) which is one of the Foward Error Correction(FEC). And we have achieved computational time reduce by using OpenMP as a parallelizing scheme.
신품론(神品論)의 유가적(儒家的) 서예미(書藝美) 특징(特徵) 고찰(考察)
박주열 ( Juyeol Park ) 한국동양예술학회 2014 동양예술 Vol.24 No.-
This study analysed Confucian aesthetic features of calligraphy in the theory of the superb work of art based on the theory of four classes, which consists Yi(逸), Shen(神), Miao(妙) and Neng(能), established by HuangXiuFu(黃休復). The theory of superb work of art seems to come from the ‘theory of YiXingXieShen(以形寫神)’ established by GuKaiZhi(顧愷之). To get the utmost class of the superb work of art, the artists should reflect their own spirits after analyzing and acquiring classic methods. Also, they should be thoroughly proficient in the classic method with a God-given talent. The superb work of calligraphy has three features below.The first feature is the beauty of FengShen(風神美). It is very important to analyse the essence of the object and reflect the spirit to show this feature. FengShen(風神) is to reflect the spirits through the emotional communications between subjects and objects. The aesthetic feature of the superb work of art is to show the beauty of FengShen, which is the excellent combination of spirits and shapes by creating a new YiJing(意 境) through the elegant and lucid spirit. The second one is the beauty of ZhongZheng(中正美). In the Confucian aesthetics, ‘Zhong(中)’ has a tremendous value, and ‘Zheng(正)’ as a normative factor is also very important. SunGuoTing(孫過庭) described ZhongZheng(中正) as ‘WeierBuFan(違而不犯)’. If an artwork reaches the stage of ZhongZheng through the stage of PingZheng(平正) and the stage of XianJue(險絶), it could be said to reflect the beauty of ZhongZheng(中正美) well. The third is the beauty of ZhongHe(中和美). The person who practices ZhongHe(中 和) perfectly is called the saint in Confucianism, and to reach the unknown stage after becoming the saint is called Shen(神). The art work which reached the unknown stage after completing ZhongHe(中和) is called the superb work of art. Therefore, the feature of the superb work of art is to show the beauty of ZhongHe(中和).