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Scalable video coding (SVC) allows to encode videos in a unique bit stream at several operating points corresponding to different quality, spatial resolution and temporal frame rate. In this paper, we apply the allpass-based wavelet filters to wavelet-based scalable video coding (WSVC) for improving the coding performance, in particular, at reduced spatial resolutions. The allpass-based wavelet filters...
In order to prevent worms from propagating rapidly, it is essential to generate worm signatures quickly and accurately. However, most of recent approaches can not generate accurate signatures for polymorphic worms in environments with noise. In this paper, we present a signature generation algorithm, namely CCSF (color coding signature finding), for polymorphic worms based on color coding. CCSF divides...
Wireless network coding (NC) has emerged as a promising technology that improves network throughput and spectrum efficiency. How large can the coding gain be? In this paper, we study the network throughput gains of two types of wireless NC schemes, the conventional wireless NC and the analog NC, respectively, over the traditional non-NC scheme in multi-hop, multi-channel, and multi-radio wireless...
Effective capacity is a useful technique to characterize the system throughput with statistical delay-constrained quality of service (QoS) guarantees. In this paper, we integrate effective capacity theory into superposition-coding (SPC) based multicast transmission to devise the efficient channel-aware multicasting scheme in wireless networks. Specifically, we propose to optimize the effective capacity...
Service-oriented wireless mesh networks have recently been receiving intensive attention as a pivotal component to implement the concept of ubiquitous computing due to their easy and cost-effective deployment. To deliver a variety of services to subscriber stations, a large volume of traffic is exchanged via mesh routers in the mesh backbone network. One of the critical problems in service-oriented...
Although some strategies of virtual worlds (e.g. Second Life) have been proven to be successful for attracting user acceptance in the western world, the effects of these strategies are questionable in the Chinese environment. When western model based virtual worlds plan business operations in China, they may face challenges such as government policy, law and cultural barriers. From the institutional-based...
Video multicast over multirate wireless networks imposes great challenges in designing efficient rate adaptation schemes due to the multi-layer hierarchical video coding and heterogeneous fading across multicast receivers. We propose a cross-layer framework for rate selection in video multicast, where different video layers have diverse loss-rate QoS requirements and thus may employ different transmission...
Recent research on network coding (NC) shows that the wireless NC can improve the network throughput in multi-hop wireless ad hoc networks since it can exploit not only the broadcast nature of the wireless channel but also the native physical-layer coding ability by mixing simultaneously arriving radio waves at relay nodes. This paper characterizes the throughput gains of two wireless NC schemes,...
In this paper, a reversible integer-to-integer wavelet transform based on non-separable 2D allpass filters is proposed for lossless image coding. The number of rounding operations included in the reversible wavelet transform is reduced by using non-separable 2D allpass filters, thus it is expected to get better coding performance. The lossless coding performance of the proposed reversible wavelet...
Recently, user selection algorithms in combination with linear pre- coding have been proposed that achieve the same scaling as the sum capacity of the MIMO BC. In this work, we study the properties of four user selection algorithms in conjunction with beamforming that guarantee certain SINR requirements under transmit power minimization. It is shown that for a large number of transmit antennas, the...
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