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Design of error-correcting balanced codes based on partition chain
주언경,정창기 에스케이텔레콤 (주) 1999 Telecommunications Review Vol.9 No.5
In this paper, error-correcting balanced codes based on partition chain are presented. The partition chain consisting of balanced vectors only can be constructed from the code partition chain of Reed-Muller codes. For the partition chain, its line coding parameters such as the maximum runlength and running digital sum are obtained. The trellis and multilevel code structure can be used to design the error-correcting balanced codes. As results, the errorcorrecting balanced codes based on the partition chain can be designed simply and they have better coding parameters than the conventional codes.
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주언경,김정구 경북대학교 전자기술연구소 1993 電子技術硏究誌 Vol.14 No.2
In this paper, detection performances are investigated and compared among the combinations of pulse signals transmitted, tares models and target detectors. Incoherent detector using LFM pulse signal is shown to be superior to other detectors in terms of detection performance and hardware complexity for Swelling 0, 1 or 3 targets. For Swerling 2 or 4 targets, semicoherent detector using SFM pulse signal performs better than other detectors if a single pulse is used. On the other hand when multiple pulses are used, incoherent detector using LFM pulse signal has more advantage in detection performance and hardware complexity than coherent and semicoherent detectors.
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주언경,蔡鍾吉 慶北大學校 1992 論文集 Vol.52 No.-
DCT coding, using energy compaction and decorrelation by transform, is proved to be efficient in the absence of channel error, but its performance degrades rapidly over noisy channel. In this paper, bit selective error correction coding technique is presented for protecting DCT coefficients over noisy channel. Since each bit transmitted in a block has different error sensitivity, bit error sensitivity is computed and analyzed for various binary codes, images and DCT block sizes. Then the bits with higher error sensitivity are selected to be protected by BCH error correction codes. As a result, without increasing transmission bits, PSNR can be improved up to 8-10dB and the image with improved quality is reconstructed.
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Hamming (7, 4) 부호를 이용한 오류정정선로 부호의 복호비트오율 분석
주언경,김정구,김영수 경북대학교 전자기술연구소 1994 電子技術硏究誌 Vol.15 No.1
In this paper, residual bit error rates of error correcting codes(ECLC) based on Hamming (7,4) code are calculated analytically, and more accurate approximation coefficients for the rate are suggested. Since encoding and decoding of ECLC is performed with the same process of error correcting code (ECC), residual bit error rate of ECC is obtained. And with the results of ECC, residual bit error rate of ECLC is obtained by considering the errors in the information and line bits. In general, the results show higher residual bit error rate in ECLC than ECC because of the error effect in line bit. And between the ECLC's based on the same ECC, the one with the lower code rate shown lower residual bit errer rate.
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QMF를 이용한 대역 압축 시스템에서의 스크램블링 효과
주언경,蔡鍾吉 慶北大學校 1992 論文集 Vol.52 No.-
Scrambling has been used as a method to encrypt the transmission signal for purpose of service protection from illegal use of unauthorized subscribers in Conditional Access system. More recently it is proposed to be used in a HDTV system such as MIT-CC in order to turn ghost, correlated noise, to uncorrelated white noise. In this paper, band rotation scrambling method using a modified line rotation is proposed for the band-compressed system using QMF. And scrambling effects on conversion of ghost to white noise and service protection are studied and analyzed. As results, effects of whitening ghost and service protection by the proposed method are shown to be superior to the existing line rotation method.
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주언경,채종길 경북대학교 전자기술연구소 1992 電子技術硏究誌 Vol.13 No.1
In DCT image coding, the quantization step-sizes are varied according to transform coefficients. And they ark reconstructed by multiplying the received quantization level and standard deviation of each coefficient which is received from the coder or estimated in the decoder. However, since quantization step-sizes are inversely proportional to the standard deviation of transform coefficient, a single step-size uniform quantizer can be used in the coder. Then, the hardware can be simplified because reception or estimation of standard deviations used for normalization in the course of quantiation is not required. In this paper, DCT image coding method using a single step-size uniform quantizer mentioned above is proposed and its performances are analyzed and compared with those of the existing method.
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On Initial Value Estimation of the Lloyd-Max Algorithm
Joo, Eon-Kyeong 경북대학교 산업기술연구소 1988 産業技術硏究誌 Vol.16 No.-
아날로그 신호를 디지탈 신호로 변환시키는 과정에서는 필수적으로 양자화가 필요하다. 따라서 이를 최적화 하는 방식에 대해 많은 연구가 진행되어 왔으며 그 중 가장 간단한 방식으로 최소평균자승오차 양자화방식이 있다. 그러나 이 방식도 그 알고리즘(Lloyd-Max Algorithm)이 반복계산을 이용함으로서 그 초기치의 정확도에 의해 최적 설계치수를 구하는 수렴도가 크게 좌우된다. 본 논문에서는 현재까지 발표된 방식들을 검토하여 새롭고 효율적인 초기치 추정방식을 제안하고 그 성능을 검토하였다.
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계층 변조를 포함한 개선된 지상파 DMB 시스템에서 연접 부호들의 오류 성능 분석
임형택,주언경,김정구,이상훈 대한전자공학회 2007 전자공학회논문지TC (Telecommunications) Vol.44 No.1
Hierarchical modulation technology which can make the advanced T-DMB(terrestrial-digital multimedia broadcasting) system backward compatible with the conventional T-DMB system and provide high-rate and high-quality services is introduced in this paper. As additional data streams are embedded within the conventional data streams by the hierarchical modulation, the advanced T-DMB system can provide high-quality video service and more broadcasting service channels. In order to guarantee the quality of both the conventional and additional services powerful error correcting scheme is required. The error performance of advanced T-DMB system with hierarchical modulation is investigated and analyzed according to the various error correcting schemes in this paper. 본 논문에서는 기존의 지상파 DMB 방식과 역 호환성을 유지하는 동시에 고전송효율, 고품질 서비스를 제공하기 위한 계층 변조 기법을 소개한다. 계층 변조를 통해 기존의 데이터 스트림에 부가적인 데이터 스트림을 삽입함에 따라 개선된 지상파 DMB 시스템은 보다 더 많은 유효 전송률을 확보하고 고품질 비디오 서비스를 제공할 수 있으며, 동시에 보다 많은 방송 서비스 채널을 제공할 수 있다. 그러나 기본 서비스의 품질을 유지하면서 부가적인 서비스의 품질을 보장하기 위해서 강력한 오류정정 방식이 요구된다. 따라서 본 논문에서는 다양한 오류정정 방식에 따른 계층변조가 적용된 개선된 지상파 DMB 시스템의 오류 성능을 조사하고 분석한다.
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