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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of Korean Institute of Communications and Information Sciences
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The Korean Institute of Communications and Information Sciences
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Volume & Issues
Volume 32, Issue 12C - Dec 2007
Volume 32, Issue 12B - Dec 2007
Volume 32, Issue 12A - Dec 2007
Volume 32, Issue 11C - Nov 2007
Volume 32, Issue 11B - Nov 2007
Volume 32, Issue 11A - Nov 2007
Volume 32, Issue 10C - Oct 2007
Volume 32, Issue 10B - Oct 2007
Volume 32, Issue 10A - Oct 2007
Volume 32, Issue 9C - Sep 2007
Volume 32, Issue 9B - Sep 2007
Volume 32, Issue 9A - Sep 2007
Volume 32, Issue 8C - Aug 2007
Volume 32, Issue 8B - Aug 2007
Volume 32, Issue 8A - Aug 2007
Volume 32, Issue 7C - Jul 2007
Volume 32, Issue 7B - Jul 2007
Volume 32, Issue 7A - Jul 2007
Volume 32, Issue 6C - Jun 2007
Volume 32, Issue 6B - Jun 2007
Volume 32, Issue 6A - Jun 2007
Volume 32, Issue 5C - May 2007
Volume 32, Issue 5B - May 2007
Volume 32, Issue 5A - May 2007
Volume 32, Issue 4C - Apr 2007
Volume 32, Issue 4B - Apr 2007
Volume 32, Issue 4A - Apr 2007
Volume 32, Issue 3C - Mar 2007
Volume 32, Issue 3B - Mar 2007
Volume 32, Issue 3A - Mar 2007
Volume 32, Issue 2C - Feb 2007
Volume 32, Issue 2B - Feb 2007
Volume 32, Issue 2A - Feb 2007
Volume 32, Issue 1C - Jan 2007
Volume 32, Issue 1B - Jan 2007
Volume 32, Issue 1A - Jan 2007
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Classification of Underwater Transient Signals Using MFCC Feature Vector
Lim, Tae-Gyun ; Hwang, Chan-Sik ; Lee, Hyeong-Uk ; Bae, Keun-Sung ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 675~680
This paper presents a new method for classification of underwater transient signals, which employs frame-based decision with Mel Frequency Cepstral Coefficients(MFCC). The MFCC feature vector is extracted frame-by-frame basis for an input signal that is detected as a transient signal, and Euclidean distances are calculated between this and all MFCC feature. vectors in the reference database. Then each frame of the detected input signal is mapped to the class having minimum Euclidean distance in the reference database. Finally the input signal is classified as the class that has maximum mapping rate in the reference database. Experimental results demonstrate that the proposed method is very promising for classification of underwater transient signals.
Analysis and Utilization of the Power Delay Profile Characteristics of Dispersive Fading Channels
Park, Jong-Hyun ; Kim, Jae-Won ; Song, Eui-Seok ; Sung, Won-Jin ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 681~688
Applying an appropriate received signal processing algorithm based on the channel characteristics is important to improve the receiver performance. Wireless channels in general exhibit various time-delay characteristics depending on their power delay profile. When the estimated channel power summation is used to determine the amount of time delay, a channel adaptive receiver structure can be implemented. In this paper, we derive a closed-form expression for the error probability of the channel classification when the estimated channel power summation is used to classify channel groups having different time delay characteristics, and present the performance gain utilizing multiple estimation results.
Transmission Capacity Analysis for Cellular Systems Using Antenna Arrays and Wireline Relay Stations
Kim, Yu-Sin ; Sung, Won-Jin ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 689~695
Wireline relay stations(RS's) are connected to cellular base stations(BS's) via radio-over-fiber(RoF) to enhance system capacity and to reduce shadow areas. Unlike wireless multi-hop systems, BS-to-RS signaling is transmitted out-of-band, thus reducing the effect of interference caused by frequency reuse. In this paper, antenna arrays used in addition to the wireline RS's are considered to evaluate the transmission capacity gain and performance variations according to the may structures. In particular, RS locations to maximize the gain, may distribution patterns for a given number of antenna elements, performance enhancement for a varying number of elements are experimentally determined to suggest a proper utilization of antenna ways in conjunction with wireline RS's.
Image Data Interpolation Based on Adaptive Triangulation
Xu, Huan-Chun ; Lee, Jung-Sik ; Hwang, Jae-Jeong ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 696~702
This paper proposes a regional feature preserving adaptive interpolation algorithm for natural images. The algorithm can be used in resolution enhancement, arbitrary rotation and other applications of still images. The basic idea is to first scan the sample image to initialize a 2D array which records the edge direction of all four-pixel squares, and then use the array to adapt the interpolation at a higher resolution based on the edge structures. A hybrid approach of switching between bilinear and triangulation-based interpolation is proposed to reduce the overall computational complexity. The experiments demonstrate our adaptive interpolation and show higher PSNR results of about max 2 dB than other traditional interpolation algorithms.
Multi-view Video Coding with View Scalability
Kim, Jae-Sub ; Choi, Mi-Nam ; Baek, Yun-Ki ; Kim, Dong-Wook ; Kim, Hwa-Sung ; Yoo, Ji-Sang ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 703~711
In this paper, we propose a multi-view coding(MVC) algorithm with considering view scalability. The proposed algorithm has a high compression efficiency by reducing inter-view redundancy through inter-view decomposition, and adaptively reconstructs a multi-view video from an encoded bit stream. Furthermore, a reference view can be decoded by a traditional H.264/AVC, and the other views are adaptively decoded at the receiver by filtering to support view scalability. Experimental results show that the proposed algorithm performed better than the conventional H.264 codec even though it offers the view scalability.
Fast Motion Estimation Algorithms Through Adaptive Application of the Hadamard Transform
Lee, Hyuk ; Kim, Jong-Ho ; Jin, Soon-Jong ; Jeong, Je-Chang ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 712~719
In this paper, we propose a new, effective, fast motion estimation algorithms using
pixels Hadamard transform. The Hadamard transform has the advantage of simplicity because it uses only addition and subtraction. Motion estimation is composed of three stages. First, it should be decided whether to terminate the search early and use a previous motion vector with DC(Direct Current) coefficients. Then the adaptive matching scan order for motion estimation should be determined according to the image complexity using AC(Alternating Current) coefficients. Experimentally, we adapted this algorithms to MVFAST and PMVFAST algorithms, and the proposed algorithms turn out to be very efficient in terms of computational speed while remaining almost the same in terms of PSNR(Peak Signal-to-Noise Ratio) compared to MVFAST and PMVFAST algorithms.
Fast Inter/Intra Mode Decision Algorithm in H.264/AVC Considering Coding Efficiency
Kim, Ji-Woong ; Kim, Yong-Kwan ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 720~728
For the improvement of coding efficiency, the H.264/AVC video coding standard employs new coding tools compared with existing coding standards. However, due to these new coding tools, the complexity of H.2641AVC encoder is greatly increased. Specially, Inter/Intra mode decision method of H.264/AVC using RDO(rate-distortion optimization) technique is one of the most complex parts in H.264/AVC. In this paper, we focus on the complexity reduction in macroblock mode decision considering coding efficiency. From the simulation results, the proposed algorithm reduce the encoding time by maximum 80% of total, and reduce the bitrate of the overall sequences by
on the average compared with existing coding methods.
An Efficient Algorithm for the Conversion of DCT Coefficients to H.264 Transform Coefficients in MPEG-2 to H.264 Transcoding
Kim, Yong-Jae ; Lee, Chang-Woo ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 729~737
The H.264/AVC video coding standard provides higher coding efficiency compared to the conventional MPEG-2 standard. Since a lot of videos have been encoded using MPEG-2, the format conversion from MPEG-2 to H.264 is essential. In this paper, we propose an efficient method for the conversion of DCT coefficients to H.264/AVC transform coefficients. This conversion is essential, since
integer transform are used in MPEG-2 and H.264/AVC, respectively. The mathematical analysis and computer simulation show that the computational complexity of the proposed algorithm is reduced compared to the conventional algorithm, while the loss caused by the conversion is negligible.
Automatic Summarization of Basketball Video Using the Score Information
Jung, Cheol-Kon ; Kim, Eui-Jin ; Lee, Gwang-Gook ; Kim, Whoi-Yul ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 738~744
In this paper, we proposed a method for content based automatic summarization of basketball game videos. For meaningful summary, we used the score information in basketball videos. And the score information is obtained by recognizing the digits on the score caption and analyzing the variation of the score. Generally, important events of basketball are the 3-point shot, one-sided runs, the lead changes, and so on. We have detected these events using score information and made summaries and highlights of basketball video games.
Analysis of Adaptive Digital Signal Processing for Anti-Jamming GPS System
Han, Jung-Su ; Kim, Seok-Joong ; Kim, Hyun-Do ; Choi, Hyung-Jin ; Kim, Ki-Yun ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 745~757
In this paper, we propose a design of GPS anti-jamming system and its operational method, which can effectively suppress interference and jamming signals induced in GPS receiver. The 7-array antenna used in the proposed system is composed of conventional 6 equi-spaced circular elements with one element on the center of antenna and can be efficiently operated under power-constrained conditions. Futhermore, in this paper, we analyze the structure and complexity of STAP and SFAP which are well known techniques in adaptive array antenna signal processing, and we compare the BER performances between STAP and SFAP in various jamming environment based on the same complexity.
PAPR Reduction in Limited Feedback MIMO Beeamforming OFDM Systems
Shin, Joon-Woo ; Jeong, Eui-Rim ; Lee, Yong-Hoon ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 758~766
High peak-to-average power ratio(PAPR) is one of serious problems in the orthogonal frequency division multiplexing(OFDM) systems. This paper proposes a PAPR reduction technique for limited feedback multiple input multiple output(MIMO) OFDM systems. The proposed method is based on the null space of the MIMO channel where a dummy signal is made in the channel's null space and then, subtracted from the original signal to reduce the PAPR. First, we show that a problem occurs when the existing method is directly applied to limited feedback MIMO case. Then, a weight function for the dummy signal is proposed to mitigate the degradation of the receiver performance while still reducing PAPR significantly. The weight function is derived from a constrained nonlinear optimization problem to minimize the mean square error between the received signal and its ideal signal. Simulation results shows that the proposed technique provides about 2.5dB PAPR reduction with 0.2dB bit-error probability loss.
Antenna Selection and Shuffling for DSTTD Systems with Correlated Transmit-Antenna
Joung, Jin-Gon ; Jeong, Eui-Rim ; Lee, Yong-Hoon ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 767~774
A new transmit antenna selection and shuffling(
) method for spatially correlated double space time transmit diversity(DSTTD) systems is proposed. The proposed method allows dumb antennas and the superposition of multiple signals at the same transmit antenna, whereas the conventional methods consider the antenna shuffling(AS) only. According to the simulation result, the proposed method provides a 1.8 dB signal-to-noise ratio(SNR) gain over the conventional methods for spatially correlated transmit antennas. Although the number of candidates for
is much higher than that of AS, it is found that the number of candidates for
can be reduced to 36 by using the characteristics and properties of preprocessing matrices, and among them, only 6 candidates are almost always chosen. Next, we empirically compare the bit-error-rate (BER) performance of the proposed method with the conventional spatial multiplexing(SM) technique with antenna selection. Simulation results show that the proposed method outperforms the SM technique.
Reducing PAPR of OFDM Signals Using Modified Partial Transmit Sequences Technique Based on Erasure Decoding
Kong, Min-Han ; Song, Moon-Kyou ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 775~781
In this paper, a modified PTS(Partial Transmit Sequences) technique that uses erasure decoding of RS (Reed-Solomon) codes is presented. At the transmitter, some check symbols in a RS codeword partitioned into subblocks are phase-rotated by phase factors. The receiver decodes received codewords by regarding the phase-rotated check symbols as erasures. Hence, this technique does not need to transmit the side information about the phase factors chosen at the transmitter. The complexity of the receiver is also reduced since the estimation process for the phase factors is not required in the receiver. There is no performance degradation due to the transmission error of the side information or the estimation error of the phase factors. To evaluate the performance of the proposed PTS technique, the CCDF(Complementary Cumulative Distribution Function) of PAPR and the BER(Bit Error Rate) are compared with those of the conventional PTS techniques.
Characteristic Analysis of Normalized D-QR-RLS Algorithm(I)
Ahn, Bong-Man ; Hwang, Jee-Won ; Cho, Ju-Phil ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 782~787
This paper presents the D(Diagonal)-QR-RLS algorithm which normalizes the fast algorithm minimizes the MSE by using Givens rotated inputs and analyzes its characteristic. This proposed one has computational complexity of O(N) and the merit that it obtains the coefficients of TDL filter directly. Although this proposed normalized algorithm has the similar form to NLMS algorithm, we can see that D-QR-RLS has superior convergence characteristic to NLMS by computer simulation.
Mobile 3D Contents Watermarking Technique Based on Buyer-Seller Watermarking Protocol
Kwon, Seong-Geun ; Lee, Suk-Hwan ; Bae, Sung-Ho ; Park, Jae-Bum ; Kwon, Ki-Ryong ;
The Journal of Korean Institute of Communications and Information Sciences, volume 32, issue 8C, 2007, Pages 788~799
This paper presents a watermarking method for copyright protection and illegal copy prevention of mobile 3D contents. The proposed method embeds copyright information and user's phone number into spatial domain and encryption domain of mobile animation data based on Buyer-Seller watermarking protocol. Furthermore, we insert user's operation key so that only authorized user can play 3D animation game in mobile device. We implemented the proposed method by using mobile animation tool, G3-SDK. From experimental results, we verified that the proposed method is capable of copyright protection and illegal copy prevention since the watermark can be well extracted against geometrical attacks, such as noise addition, data accuracy variableness and data up/down scaling.