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DS-CDMA DMB 하향링크에서의 블라인드 신호공간 채널추정 기법
양완철,이병섭,Yang, Wan-Chul,Lee, Byung-Seu 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.9A
본 논문에서는 신호공간과 장음공간과의 직교성을 이용하는 종래의 부분공간 방식과는 달리 신호공간만을 이용하여 채널응답을 추정해낼 수 있는 긴 코드 DSCDMA DMB 하향링크 시스템에서의 새로운 채널추정기법을 제안한다. 신호공간만을 이용하므로 제안된 기법은 종래의 부분공간 방식에서의 공분산 행렬 사이즈 문제를 해결할 수 있고 따라서 실제 구현 가능한 적정한 사이즈의 공분산 행렬로 부분공간 분석을 통한 채널추정기업에 사용될 수있다. In this paper, we propose a new channel estimation technique for long code DS-CDMA DMB down link system which estimate the channel response based on the signal space vector only, unlike the most conventional sub-space method relying on the orthogonal property of noise space vectors to the signal space vector. Because of this property of the proposed method, very optimum covariance matrix in its dimension can be used in subspace analysis channel estimation technique otherwise it is likely too large to be implemented practically.
DS/CDMA DMB 하향 링크에서 복잡도가 감소된 블라인드 부분 공간 채널 추정
양완철,이병섭,Yang Wan-Chul,Lee Byung-Seub 한국전자파학회 2004 한국전자파학회논문지 Vol.15 No.9
본 논문에서는 정합 필터 출력을 이용하여 연산 복잡도가 감소된 DS/CDMA DMB 하향 링크 시스템에서의 부분 공간 채널 추정 기법을 제안한다. 연산 복잡도 감소 효과는 채널 벡터의 길이가 짧고 시스템의 부하가 적절할 때 매우 크게 나타난다. 이전에 제안된 부분 공간 채널 추정 알고리즘은 화산 이득이 큰 시스템에서 막대한 연산 복잡도 문제를 겪게 된다. 제안된 알고리즘에 약간의 성능 손실이 발생하지만 데이터 행렬의 길이가 길어지게 되면 그 영향은 미미해진다. 시뮬레이션과 분석적인 MSE 성능의 유도를 통해 성능을 평가한다. In this paper, we propose a subspace channel estimation technique for DS/CDMA DMB down link system, which can obtain reduction in numerical complexity by using of matched filtering outputs. The complexity reduction is considerable when the channel length is small and the system is moderately loaded. Previously proposed subspace-based blind channel estimation algorithm suffer from high numerical complexity for systems with large spreading gains. Although the proposed algerian suffers a slight performance loss, it becomes negligible for large observation length. Performance is evaluated through simulations and the derivation of the analytical MSE.
DS/CDMA DMB 하향 링크에서의 신호 공간에 기초한 블라인드 채널 추정
양완철,이병섭,Yang Wan-Chul,Lee Byung-Seub 한국전자파학회 2004 한국전자파학회논문지 Vol.15 No.9
본 논문에서는 긴 코드 DS/CDMA DMB 하향링크 시스템에서의 신호공간에 기초한 새로운 채널추정기법을 제안한다. 신호공간과 잡음공간과의 직교성을 이용하는 종래의 부분공간 방식과는 달리 신호공간만을 이용하여 채널응답을 추정할 수 있다. 신호공간만을 이용하므로 제안된 기법은 종래의 부분공간 방식에서의 연산복잡도 문제를 해결할 수 있고 따라서 실제 구현 가능한 적절한 사이즈의 공분산 행렬로 부분공간 분석을 통한 채널추정기법에 사용될 수 있다. 논문을 통하여 제안된 기법과 관련된 수식을 도출하고 시뮬레이션 및 수치결과를 통해 제안된 기법의 유효성을 보인다. In this paper, we propose a new channel identification technique for long code DS/CDMA DMB down link system which estimate the channel response based on the signal space vector only, unlike the most conventional subspace method relying on the orthogonal property of noise space vectors to the signal space vector. Because of this property of the proposed method, it is optimum and practical in manipulation of the covariance matrix to be analyzed. In the paper, we derive the mathematical expression necessary to clarify the proposed method and show the relevant simulation and numerical results to verify the validity of the proposed algorithm.
양완철 ( Wan Chul Yang ) 東亞大學校附設 石堂傳統文化硏究院 1981 石堂論叢 Vol.5 No.-
According to the modern criminal law, those who are sentenced to imprisonment are exempt from hard labor, but those who are condemned to penal servitude can`t escape it. The punishment of imprisonment has been largely imposed on the political offenders. In this respect, the imprisonment of today are similar to chin ku of the Han Dynasty. Chin ku in the Han times means to disqualify a person from serving as an official or to degrade an official to lower status than that of the common people by deposing him from his post. The provisions on chin ku were enforced as a means to prevent an official from committing crime. chin ku was not only imposed on the official dismissed from his office in the course of struggle fom power, but also on his kinsmen that are so near to him in blood as to wear mourning dress for more than five months in memory of him, those who became officials by his recommendation or appointment, and his followers. There were once innocent people whose social status was too severely restricted to be qualified for officials. Among them were the merchant, the adopted husband who entered his wife`s family and worked for them in compensation for his marriage, and the commoner having less than 40,000 gian worth of property. Some historians hold that the merchants were degraded to the lowest class on the ground that they had been disqualified for public service since the early Han times. But we should remember that the provisions which kept them from entering officialdom were abolished in 119 B.C. during the reign of the Emperor Wu di. Thereafter they could be officials. That means their social status was raised to the common people. On the basis of the provision enforced in the reign of the Emperor Wen di that an adopted husband can not be appointed as an official, some historians assert that an adopted husband was degraded to a mere obligatory slave. But it is presumed that one who lived with his wife`s family was interpreted as an adoped husband, irrespective of whether he made an obligatory contract with his wife`s family. The provision in the reign of the Emperor jing di that the commoner having less than 40,000 gian worth of property couldn`t enter officialdom was not carried into effect from the next Emperor Wu di.
DS-CDMA DMB 하향링크에서의 블라인드 신호공간 채널추정 기법
양완철(Wan Chul Yang),이병섭(Byung Seub Lee) 대한두경부종양학회 2000 대한두경부 종양학회지 Vol.16 No.2
본 논문에서는 신호공간과 장음공간과의 직교성을 이용하는 종래의 부분공간 방식과는 달리 신호공간만을 이용하여 채널응답을 추정해낼 수 있는 긴 코드 DSCDMA DMB 하향링크 시스템에서의 새로운 채널추정기법을 제안한다. 신호공간만을 이용하므로 제안된 기법은 종래의 부분공간 방식에서의 공분산 행렬 사이즈 문제를 해결할 수 있고 따라서 실제 구현 가능한 적정한 사이즈의 공분산 행렬로 부분공간 분석을 통한 채널추정기업에 사용될 수있다. In this paper, we propose a new channel estimation technique for long code DS-CDMA DMB down link system which estimate the channel response based on the signal space vector only, unlike the most conventional sub-space method relying on the orthogonal property of noise space vectors to the signal space vector. Because of this property of the proposed method, very optimum covariance matrix in its dimension can be used in subspace analysis channel estimation technique otherwise it is likely too large to be implemented practically.