A novel error control scheme for video streaming over IEEE802.11 network

2004 ◽  
Author(s):  
X. Liu ◽  
W. Badawy
Keyword(s):  
Video Streaming ◽  
Error Control ◽  
Control Scheme

scholarly journals An Error Control Scheme for Multicast Video Streaming on the Last Hop Wireless LANs

2006 ◽  
pp. 962-969 ◽  
Author(s):  
Junghoon Lee ◽  
Mikyung Kang ◽  
Gyungleen Park ◽  
Hanil Kim ◽  
Choelmin Kim ◽  
...  
Keyword(s):  
Video Streaming ◽  
Error Control ◽  
Wireless Lans ◽  
Control Scheme ◽  
Multicast Video Streaming

scholarly journals Observer-based robust integral of the sign of the error control of class I of underactuated mechanical systems: Theory and real-time experiments

2021 ◽  
pp. 014233122110313
Author(s):  
Afef Hfaiedh ◽  
Ahmed Chemori ◽  
Afef Abdelkrim
Keyword(s):  
Real Time ◽  
Error Control ◽  
Degrees Of Freedom ◽  
Sliding Mode ◽  
Mechanical Systems ◽  
Class I ◽  
Control Input ◽  
Underactuated Mechanical Systems ◽  
Control Scheme ◽  
And Performance

In this paper, the control problem of a class I of underactuated mechanical systems (UMSs) is addressed. The considered class includes nonlinear UMSs with two degrees of freedom and one control input. Firstly, we propose the design of a robust integral of the sign of the error (RISE) control law, adequate for this special class. Based on a change of coordinates, the dynamics is transformed into a strict-feedback (SF) form. A Lyapunov-based technique is then employed to prove the asymptotic stability of the resulting closed-loop system. Numerical simulation results show the robustness and performance of the original RISE toward parametric uncertainties and disturbance rejection. A comparative study with a conventional sliding mode control reveals a significant robustness improvement with the proposed original RISE controller. However, in real-time experiments, the amplification of the measurement noise is a major problem. It has an impact on the behaviour of the motor and reduces the performance of the system. To deal with this issue, we propose to estimate the velocity using the robust Levant differentiator instead of the numerical derivative. Real-time experiments were performed on the testbed of the inertia wheel inverted pendulum to demonstrate the relevance of the proposed observer-based RISE control scheme. The obtained real-time experimental results and the obtained evaluation indices show clearly a better performance of the proposed observer-based RISE approach compared to the sliding mode and the original RISE controllers.

scholarly journals Adaptive Packet-Level Interleaved FEC for Wireless Priority-Encoded Video Streaming

2009 ◽  
Vol 2009 ◽  
pp. 1-14 ◽  
Author(s):  
Rouzbeh Razavi ◽  
Martin Fleury ◽  
Mohammed Ghanbari
Keyword(s):  
Video Streaming ◽  
Error Control ◽  
Estimation Error ◽  
Wireless Channel ◽  
Industry Standard ◽  
Correlated Error ◽  
Video Broadcast ◽  
Video Input ◽  
Forward Error ◽  
Picture Type

Packet-level Forward Error Control (FEC) for video streaming over a wireless network has received comparatively limited investigation, because of the delay introduced by the need to assemble a group of packets. However, packet-level interleaving when combined with FEC presents a remedy to time-correlated error bursts, though it can further increase delay if this issue is not addressed. This paper proposes adapting the overall degree of interleaved packet-level FEC according to the display deadlines of packets, transmit buffer occupation, and estimated video input to the wireless channel, all of which address the issue of delay. To guard against estimation error, the scheme applies a conservative adaptation policy, which accounts for picture type importance to ensure that display deadlines are met, thus avoiding this defect of interleaving. The paper additionally introduces a greedy algorithm that effectively groups packet-level FEC protection according to packet priority. Priority encoding adds extra protection during deep fades. As feedback is not required, the interleaving scheme is suitable for all forms of video broadcast. A Bluetooth piconet demonstrates the packet-level FEC interleaving scheme, which provides higher quality delivered video compared to the industry-standard Pro-MPEG Cop#3r2 interleaving scheme.

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