Chih-Heng Ke

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CHIH-HENG KE, CE-KUEN SHIEH, WEN-SHYANG HWANG AND ARTUR ZIVIANI Department of Computer Science and Information Engineering National Kinmen Institute of Technology Kinmen, 892 Taiwan Department of Electrical Engineering National Cheng Kung University Tainan, 701 Taiwan Department of Electrical Engineering National Kaohsiung University of Applied Sciences(More)
The objective of this paper is to present a novel realistic simulation tool-set for evaluating video delivered quality over wireless network. This tool-set integrates EvalVid and NS-2. With the integration, researchers can easily analyze their designed mechanisms, such as network protocols or QoS control schemes in a realistic simulation environment. We(More)
The purpose of this paper is to study the packet loss effect on MPEG video transmission quality in wireless networks. First, we consider the distribution of packet losses in wireless network, including distributed and burst packet losses. Besides, we also discuss the additional packet drops by the play-out buffer at the received end, and the effect of the(More)
This paper proposes an enhanced adaptive FEC (EAFEC) algorithm implemented in the access point (AP) to improve video delivery over wireless networks. Unlike traditional static FEC mechanisms, which add redundant data to transmission data in a fixed number, the number of redundant FEC data for the EAFEC mechanism is determined by the AP, which is based on(More)
This paper proposes a Random Early Detection Forward Error Correction (RED-FEC) mechanism to improve the quality of video delivered over Wireless Local Area Networks (WLANs). In contrast to previous FEC schemes, in which the rate determination information is fed back from the receiver side, in our proposed method, the redundancy rate is calculated directly(More)
Based on the standardized IEEE 802.11 Distributed Coordination Function (DCF) protocol, this paper proposes a new backoff mechanism, called Smart Exponential-Threshold-Linear (SETL) Backoff Mechanism, to enhance the system performance of contention-based wireless networks. In the IEEE 802.11 DCF scheme, the smaller contention window (CW) will increase the(More)
The failure of legacy packet markers such as the Single Rate Three Color Marker (SRTCM) and the Two Rate Three Color Marker (TRTCM) to distinguish important and less important data renders them unsuitable for MPEG video transmission in a DiffServ network. Therefore, we propose a Two Markers System (TMS) to improve the delivery quality of MPEG video streams.(More)
In recent years, the issue of Vehicular Ad-Hoc Network (VANET) has received great attention, and more and more VANET-related researches have been brought up. Generally speaking, the biggest difference between VANET and traditional Ad-Hoc is the velocity of carriers because in VANET, the velocity of vehicles the carriers is much higher than that of the(More)