Yuning Dong

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In this paper, a QoS provisioning spectrum decision algorithm based on predictions is proposed in cognitive radio networks. By recording and analyzing the historical information, the algorithm can learn intelligently the rule of occupied spectrum by licensed users, and can predict the length of a spectrum hole, with the combination of the use's QoS request(More)
In order to improve the quality of H.264 video transmission in wireless networks, a data hiding based adaptive error recovery approach is proposed in this paper. With this approach, the important data for each macroblock (MB) of the H.264 intra-coded I frame are extracted adaptively at the encoder and embedded into the RTP header of the next frame. At the(More)
Cognitive radio is a dynamic spectrum access technology as a solution to spectrum under-utilization problem in some licensed bands. Cognitive radio should sense the spectrum usage steadily to prevent interfering licensed users and spectrum occupancy information of licensed users can be used both for learning the usage and prediction of the future occupancy.(More)
In ad hoc networks, stability is the priority factor in route selection. However, the traditional path stability computation methods are so idealized that their results do not accord with the reality. A novel path stability computation model is proposed in this letter, in which the correlation factor is introduced to describe the dependency degree between(More)
To analyze network QoS (Quality of Service) performance and better utilize network resources, this paper develops an analytical model of QoS class mapping for hybrid QoS domains based on network calculus theory. Based on this model, an elastic QoS Mapping scheme with Flow Aggregate (EQM-FA) is proposed to support end-to-end QoS of multimedia services over(More)
—An autoregressive channel prediction model is presented for cognitive radio systems. This model adopts a second-order AR model and a particle filter. In this paper, an AR model of order p is used to approximate the flat Rayleigh fading channels. Simulation results show that the performance of the proposed autoregressive channel prediction model based on(More)
—In this paper, a novel rate optimization scheme based on discrimination is proposed for multimedia transmission over heterogeneous IP networks. Via analysis wireless channel characteristics, the scheme can detect the nature of packet losses by sending large and small packets alternately, then adopt adaptive rate control strategies to increase the network(More)
A new transmission control protocol for video streaming over wireless-wired IP networks is proposed in this paper. The protocol differentiates the natures of packet losses and adopts different rate and error control strategies accordingly for video QoS control. Simulation results are given to show its effectiveness in reducing packet loss rate and(More)