Jeng‐Ji Huang

National Taiwan Normal University

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David Shiung

National Changhua University of Education

Huei-Wen Ferng

National Taiwan University of Science and Technology

Chung‐Yen Su

National Taiwan Normal University

Chung-Fan Lee

University of Copenhagen

Wen-Yan Kao

National Cheng Kung University

Sen-Ching Chang

Verizon (United States)

Yao-Jen Liang

National Ilan University

George Q. Huang

Hong Kong Polytechnic University

Ge-Ming Chiu

National Taiwan University of Science and Technology

Che‐Yu Chang

National Center for Research on Earthquake Engineering

Cooperative Institutions

National Taiwan Normal University

National Taiwan University

National Taiwan University of Science and Technology

National Taipei University of Technology

National Chung Hsing University

National Taipei University

National Cheng Kung University

National Yang Ming Chiao Tung University

National Central University

National Tsing Hua University

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An improved 802.11 DCF in a hybrid environment

Zong-Jhe Wu Jeng‐Ji Huang

Distributed coordination function (DCF) is the main technique of IEEE 802.11, which relies on carrier sense multiple access/collision avoidance (CSMA/CA) to reduce collision among stations. In this paper, a scheme is proposed to improve the throughput performance of the DCF in a hybrid environment, where a ready to send (RTS) frame is used when the length of a packet exceeds a threshold. Suppose, e.g., that a RTS frame and a packet are transmitted simultaneously, the result under the legacy DCF is that a collision occurs and both of them fail; the transmission bandwidth is thus wasted. To prevent this, an extra portion is added in front of the packet in the proposed scheme, and its length equals the size of a RTS frame. Clearly, it can prevent the packet from the collision process whenever it experiences a collision with one or multiple RTS frames.

Distributed coordination function

10.1109/icufn.2009.5174312

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The signaling efficiency of group mobility management in Cellular IP

Journal of the Chinese Institute of Engineers (2011)

Jeng‐Ji Huang David Shiung

Grouping is usually beneficial from a system efficiency perspective, e.g., trunking efficiency achieved by sharing a common channel among users. In this article, the signaling cost of mobility management in Cellular IP is numerically analyzed. In addition, it is shown analytically that by organizing mobile hosts having the same mobility pattern into a group, the signaling cost of mobility management in Cellular IP can be effectively reduced. This is because location information of the group can often be refreshed by data packets sent by group members. As a result, the reduction is more significant for a larger number of busy mobile hosts in the group.

Trunking

Mobility management

10.1080/02533839.2011.591965

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Reversible and Embedded Watermarking of Medical Images for Telemedicine

ICST Transactions on Security and Safety (2015)

Chung‐Yen Su Jeng‐Ji Huang Che-Yang Shih Yutang Chen

In this paper, we propose a new reversible watermarking of medical images for the applications in telemedicine. By using a bit-stream insertion scheme, the patient's information can be treated as a watermark and can be embedded into the bit-stream of a cover image for remote transmission. The proposed method simplifies the design of traditional image coding after a reversible watermarking. Experimental results show that the compression ratio can be achieved up to 3.025. The watermarking capacity can be obtained over 0.75 bpp for some common images. In addition, the watermark can be extracted exactly and the cover image can be reconstructed either in a lossless way or a lossy way. The obtained results also show the improvement with respect to previous works.

Lossy compression

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QoS control over the power saving in 3GPP LTE advanced wireless networks

Jeng‐Ji Huang Tung‐Tai Kuo Tzu-Han Chen Chen-Ju Yang

The power saving operation, called discontinuous reception (DRX), in Third-Generation Partnership Project (3GPP) Long-Term Evolution Advanced (LTE Advanced) has recently been discussed in many studies. However, most of them focus only on the first moments, i.e. means, of interested performance metrics such as power-saving factor, transmission delay, etc. In order to gain full quality of service (QoS) control for real-time applications, it is imperative to obtain the distribution function of, in particular, the transmission delay. Thus, in this paper, extensive simulations are performed to examine the effects of various DRX parameters on the distribution function of the transmission delay.

LTE Advanced

10.1109/iswpc.2013.6707436

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Buffer-Aware and Delay-Sensitive Resource Allocation in the Uplink of 3GPP LTE Networks

Wireless Personal Communications (2015)

Chiapin Wang Jeng‐Ji Huang Chung‐Yen Su

LTE Advanced

10.1007/s11277-015-2490-3

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Reversible and Embedded Watermarking of Medical Images for Telemedicine

Chung‐Yen Su Jeng‐Ji Huang Che-Yang Shih Yutang Chen

In this paper, we propose a new reversible watermarking of medical images for the applications in telemedicine. By using a bit-stream insertion scheme, the patient’s information can be treated as a watermark and can be embedded into the bit-stream of a cover image for remote transmission. The propos

Bitstream

10.4108/icst.iniscom.2015.258307

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A Multicast Routing Algorithm Using Movement Prediction for Mobile Ad Hoc Networks

Huei-Wen Ferng Hsing‐Yu Chen Jeng‐Ji Huang Wen-Yan Kao

In mobile ad hoc networks, how to achieve the multicast communication is a challenging task due to the fact that the topology may change frequently and communication links may be broken because of users' mobility. To keep network connectivity, control packets are periodically sent within the system, resulting in high system overhead. To reduce the amount of control packets, a multicast routing algorithm for mobile ad hoc networks is designed in this paper. Utilizing movement prediction to estimate the life time of connections for every node pairs, the algorithm largely reduces the amount of control packets as compared to those using periodical path maintenance. Based on the estimate, a local path search rather than a global one is performed before the breakage of a path to get a backup path. This further lowers the system load. To avoid frequent path breakage, the algorithm chooses the path with the longest life among all possible paths. Using a simulation approach, we investigate the performance of the proposed algorithm through a comparison with an algorithm previously proposed in the literature. Based on the numerical results, we demonstrate that our proposed algorithm performs well.

10.1109/vetecs.2005.1543789

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Reviewers

Syuan‐Yi Chen Yen‐Lin Chen Darmanto Yulianti Chih-Peng Taiwan Yu-Cheng Fan

10.1109/ispce-asia53453.2021.9652182

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Flexible TXOP assignments for efficient QoS scheduling in IEEE 802.11e WLANs

Jeng‐Ji Huang Che‐Yu Chang Huei-Wen Ferng

A basic concept in 802.11e is Transmission Opportunities (TXOPs). The draft amendment of IEEE 802.11e includes a Simple Scheduler, in which a fixed length of TXOPs is assigned according to mean data rates. Since some traffic present bursts of variable size, several enhancements have been proposed previously; e.g., TXOPs are allocated according to the actual buffered data which is indicated through transmissions performed in the previous TXOP. Though the allocations are efficient in channel utilization, a delay could inevitably be incurred by packets, due to that new arrivals cannot be transmitted in the current TXOP, but have to wait until next. In this paper, an efficient scheduling scheme is proposed that aims at improving packet delay while maintaining high channel utilization. In the proposed scheme, maximal residual bandwidth is assigned to a station taking into account demands from all the other stations, and the unused portion is reclaimed. From extensive simulation results, it is shown that packet delay is effectively improved, compared to two previous enhancements of the Simple Scheduler, while achieving high throughput performance.

IEEE 802

10.1109/wocn.2008.4542513

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Tricks for Cascading Running-Sum Filters With Their Variations for High-Performance Filtering [Tips & Tricks]

IEEE Signal Processing Magazine (2023)

David Shiung Jeng‐Ji Huang

High-performance filtering (a flat passband, a sharp transition band, and a highly suppressed stopband) is always the ultimate goal of any digital signal processing (DSP) practitioner. However, high-performance filtering is traditionally the synonym of high implementation complexity. In this article, we propose an approach to reach high-performance filtering with lower implementation complexity. This approach designs a composite low-pass filter (LPF) by cascading a number of simple filters of diverse magnitude responses. In particular, this composite filter consists of prototype infinite impulse response (IIR) filters together with a mixture of shaping running-sum filters and their variations. These component shaping filters contain no multiplier at all. The numeric example shows that the filtering performance of our composite filter outperforms that of the conventional IIR filters (e.g., Chebyshev type 1 and elliptic filters) of higher complexity.

Stopband

2D Filters

Transition band

Passband

Finite impulse response

10.1109/msp.2023.3247903

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Citations (3)