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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)
An adaptive strategy based stable link selection algorithm is proposed in this paper, in which the stable neighbor metric and local movement metric are defined. On the basis, the stability probability of each link is computed adoptively to find the most stable link or route in a route discovery. The simulation results show that our algorithm can effectively(More)
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)
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 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)
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)
Based on cross-layer design, a modified 2-dimensional queuing model (2DQM) is proposed in this paper to tackle the problem of end-to-end quality of service (QoS) metric calculation. This model exploits the traffic arrival process, multi-rate transmission in the physical layer and error recovery technology with the protocol of truncated automatic repeat(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)