This paper proposes a new multi-rate H.264 scalable video multicast in lossy network using network coding. We first prioritize video layer based on its effect to the end-to-end video quality. Each video layer is route...
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This paper proposes a new multi-rate H.264 scalable video multicast in lossy network using network coding. We first prioritize video layer based on its effect to the end-to-end video quality. Each video layer is routed via the path obtained from the optimization framework under the constraints on QoS guarantees. Different destinations may receive different number of video layers depended on their max flows. The bottleneck in the network is resolved by using network coding to ensure that all destinations can receive the rate equaling their max flows. The network coding is only applied within the same layer. Simulation and numerical results under randomly generated networks show the advantage of the proposed scheme in terms of objective and subject qualities of the end-to-end video.
We present ToroStream, our P2P video streaming protocol designed around network coding (NC), and we investigate its applicability to low-delay applications such as live video streaming and videoconferencing. While NC ...
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ISBN:
(纸本)9781467310680
We present ToroStream, our P2P video streaming protocol designed around network coding (NC), and we investigate its applicability to low-delay applications such as live video streaming and videoconferencing. While NC offers several benefits for P2P content distribution, the coding operations at the network nodes introduce a delay that is detrimental for low-delay communications. To this end, we designed a push-based packet scheduling mechanism devised to minimize the communication delay. Furthermore, our protocol is designed around a low computational complexity class of rateless codes that enable us to experiment on real networks where the nodes have limited computational capabilities. That enables us to experiment with two typical low-delay applications such as live video streaming and videoconferencing in a realistic network scenario. The experiments show that our protocol enables continuous playback with limited initial delay and we point out the issues that NC poses in low-delay applications.
network coding is a recent technique that has many advantages such as reducing the bandwidth consumption and increasing the throughput. IROCX [1] is a routing algorithm that applies network coding while considering th...
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network coding is a recent technique that has many advantages such as reducing the bandwidth consumption and increasing the throughput. IROCX [1] is a routing algorithm that applies network coding while considering the interference impact. However, it assumes a constant transmission power. We extend IROCX by allowing the nodes to transmit with several power levels. Our approach, TC-IROCX (Topology Control on Interference-aware Opportunistically Coded Exchanges) aims at maximizing the number of accepted flows. The simulation results show that TC-IROCX adjusts the transmission power according to the network state in order to enhance the acceptation rate.
In this paper, we propose an opportunistic cooperative transmission (OCT) scheme combined with bi-directional relaying and physical layer network coding (PNC) in wireless sensor networks (WSNs).This scheme can be swit...
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In this paper, we propose an opportunistic cooperative transmission (OCT) scheme combined with bi-directional relaying and physical layer network coding (PNC) in wireless sensor networks (WSNs).This scheme can be switched between PNC based distributed space-time block coding scheme and cooperative network-assisted diversity multiple access scheme to obtain the minimized frame-error-ratio (FER) performance. We analyze the FER performance difference when the two schemes are adopted separately to find the location of the relay where the system should change its cooperative scheme to obtain the smaller FER. Numerical and simulation results demonstrate that lower error rate can be obtained wherever the relay locates in the proposed scheme.
network coding helps maximize the network throughput. However, such schemes are also vulnerable to pollution attacks in which malicious forwarders inject polluted messages into the system. Traditional cryptographic so...
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ISBN:
(纸本)9781467325790
network coding helps maximize the network throughput. However, such schemes are also vulnerable to pollution attacks in which malicious forwarders inject polluted messages into the system. Traditional cryptographic solution, such as digital signatures, are not suited for network coding, in which nodes do not forward the original packets, but rather linear combinations of the data they received. We describe secure scheme that uses batch techniques and selective verification to efficiently verify the integrity of the received packets. We show that for real peer-to-peer networks, our scheme is much more efficient than previously suggested schemes.
In order to overcome the problem of low spectral efficiency in one-way relay network, relay selection problem of the two-way relay channel was investigated. In our research work, single relay-selection strategies with...
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ISBN:
(纸本)9781467307215
In order to overcome the problem of low spectral efficiency in one-way relay network, relay selection problem of the two-way relay channel was investigated. In our research work, single relay-selection strategies with amplify forwarding and network coding in two-way network were proposed. Moreover, bit error rate (BER) and diversity expressions were derived and verified by simulation. Our research results indicated that two strategies can achieve full diversity in the multi-relay wireless network. In the high SNR region, the bit error rate of TWSRS-NC is half of that of TWSRS-AF, and the gain of TWSRS-NC is twice as much as that of TWSRS-AF.
In this paper, a data sharing system using a coordinator with layered transmission is proposed. We focus on secured data connections from all users to all users of the conferencing group. A typical example is secured ...
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In this paper, a data sharing system using a coordinator with layered transmission is proposed. We focus on secured data connections from all users to all users of the conferencing group. A typical example is secured group communication between a group of users e.g. a social group during a multi-user audio or video conference. Secured unicast scheme, secured broadcast scheme, and network coding scheme are considered for the data distribution scheme in downlink. The layered transmission can achieve improvement of the network throughput. In addition, the hierarchical modulation is introduced to improve the network throughput, and an effective region of the hierarchical modulation is shown. Finally, the network throughput of the secured unicast, the secured broadcast, and the network coding is compared, and we find that the network coding is the most effective scheme for the data sharing system using the coordinator with layered transmission.
This manuscript provides a model to characterize the energy savings of network coded storage (NCS) in storage area networks (SANs). We consider blocking probability of drives as our measure of performance. A mapping t...
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This manuscript provides a model to characterize the energy savings of network coded storage (NCS) in storage area networks (SANs). We consider blocking probability of drives as our measure of performance. A mapping technique to analyze SANs as independent M/G/K/K queues is presented, and blocking probabilities for uncoded storage schemes and NCS are derived and compared. We show that coding operates differently than the amalgamation of file chunks and energy savings are shown to scale well with striping number. We illustrate that for enterprise-level SANs energy savings of 20-50% can be realized.
In cognitive radio networks (CRNs), there is no guarantee on the availability of spectrum for the opportunistic communications between cognitive radio (CR) users. Transmission design plays a key role in leveraging the...
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In cognitive radio networks (CRNs), there is no guarantee on the availability of spectrum for the opportunistic communications between cognitive radio (CR) users. Transmission design plays a key role in leveraging the benefits of CRNs. In this paper, we propose an efficient batch transmission scheme for the data transmission in multi-channel CRNs with practical lossy channels. The proposed scheme exploits the dynamic spectrum opportunities by combining opportunistic routing strategy with network coding based multi-channel transmission. We derive network performance measures of the scheme in terms of batch delay, which provide better insights into the data transmission capability than packet based link delay analysis. Our analyses, validated by simulations, show that the proposed scheme significantly outperforms others, reducing batch delay by up to 60%.
Determining the achievable rate region for networks using routing, linear coding, or non-linear coding is thought to be a difficult task in general, and few are known. We describe the achievable rate regions for three...
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Determining the achievable rate region for networks using routing, linear coding, or non-linear coding is thought to be a difficult task in general, and few are known. We describe the achievable rate regions for three interesting networks and show that achievable rate regions for linear codes need not be convex.
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