In recent years, a significant amount of research has been conducted to explore the benefits of network coding in different scenarios, from both theoretical and simulation perspectives. In this paper, we utilize queue...
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ISBN:
(纸本)9781509013289
In recent years, a significant amount of research has been conducted to explore the benefits of network coding in different scenarios, from both theoretical and simulation perspectives. In this paper, we utilize queueing theory to propose an analytical framework for bidirectional unicast flows in multihop wireless mesh networks, and study throughput of interf-low network coding. We analytically determine performance metrics such as the probability of successful transmission in terms of collision probability, and feedback mechanism and retransmission. Regarding the coding process, our model uses a multi-class queueing network where coded packets are separated from native packets and have a non-preemptive higher priority over native packets, and both queues are in a stable state. Finally, we use simulations to verify the accuracy of our analytical model.
In network coding, the successive original video frame data can be transmitted at once. However, if insufficient number of innovative packets are transmitted due to the packet loss or delay, network coding system is t...
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ISBN:
(纸本)9789881476821
In network coding, the successive original video frame data can be transmitted at once. However, if insufficient number of innovative packets are transmitted due to the packet loss or delay, network coding system is to be underdetermined. Thus, since network coding matrix (random coefficient matrix) is not invertible, original data cannot be recovered by matrix inversion. To solve this problem, in this paper, a new compressive sensing method with graph Laplacian regularizer is proposed, which exploits correlation between successive original video frame data. Experimental results demonstrate the effectiveness of proposed algorithm, implemented by the alternative direction multiplier method (ADMM) and show that PSNR values from reconstructed images are above 33dB with coding matrix Phi is an element of C-MXN of which measurement M = 0.75N and 22dB with measurement M = 0.66N, respectively.
In this paper, we consider a multiple-access broadcast channel (MABC) with ARQ feedback, in which M end-users wish to exchange messages with a central node or base-station. In this scenario, an end-user may overhear o...
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ISBN:
(纸本)9781479966646
In this paper, we consider a multiple-access broadcast channel (MABC) with ARQ feedback, in which M end-users wish to exchange messages with a central node or base-station. In this scenario, an end-user may overhear other endusers' messages prior to the re-transmission phase. We propose a new network coded (NCed)-ARQ scheme with reverse-link-assistance (RLA) that exploits this overheard information in uplink transmission to increase the downlink throughput. We derive throughput expressions for the new NCed-ARQ scheme in wireless additive white Gaussian noise with Rayleigh fading channel, which we numerically evaluate. For low/moderate SNRs, NCed-ARQ with RLA greatly improves the performance of downlink throughput.
In Mars-to-Earth communications, data transmission suffered severe losses due to the huge path-loss, extremely long propagation delay and lack of line-of-sight link in rovers-toEarth. Based on delay/disruption toleran...
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ISBN:
(纸本)9781467398145
In Mars-to-Earth communications, data transmission suffered severe losses due to the huge path-loss, extremely long propagation delay and lack of line-of-sight link in rovers-toEarth. Based on delay/disruption tolerant networks (DTN), we proposed a systematic Raptor network coding (RNC) scheme for the multi-rovers transform data through an orbiter to Earth station communication scenarios. To enhance the reliability of rover-to-Earth file delivery, and considering the limited capacity of the relaying orbiter, a simplified network coding scheme is designed for the orbiter. We analyzed the asymptotic performance of RNC scheme. Moreover, an improved RNC (IRNC) scheme is optimized in a finite code-length and limited coding complexity. Simulation results show that, our RNC and IRNC schemes can achieve better performance in comparison with existing distributed rateless erasure codes.
This paper considers a problem of anonymous transmission in physical-layer network coding against eavesdropping. The task is to organize data transmission so that an adversary can not determine who communicates with w...
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ISBN:
(纸本)9781509042319
This paper considers a problem of anonymous transmission in physical-layer network coding against eavesdropping. The task is to organize data transmission so that an adversary can not determine who communicates with whom. It is achieved by making the messages to be untraceable. Scheme based on lattice coset coding strategy and lattice properties is proposed. The point of the scheme is to change input message at a relay side to another random message from the same coset.
Cloud service providers off er storage outsourcing facility to their clients. In a secure cloud storage (SCS) protocol, the integrity of the client's data is maintained. In this work, we construct a publicly verif...
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ISBN:
(纸本)9781450342339
Cloud service providers off er storage outsourcing facility to their clients. In a secure cloud storage (SCS) protocol, the integrity of the client's data is maintained. In this work, we construct a publicly verifiable secure cloud storage protocol based on a secure network coding (SNC) protocol where the client can update the outsourced data as needed. To the best of our knowledge, our scheme is the first SNC-based SCS protocol for dynamic data that is secure in the standard model and provides privacy-preserving audits in a publicly verifiable setting. Furthermore, we discuss, in details, about the (im)possibility of providing a general construction of an efficient SCS protocol for dynamic data (DSCS protocol) from an arbitrary SNC protocol. In addition, we modify an existing DSCS scheme (DPDP I) in order to support privacy-preserving audits. We also compare our DSCS protocol with other SCS schemes (including the modified DPDP I scheme). Finally, we figure out some limitations of an SCS scheme constructed using an SNC protocol.
In advanced Peer-to-Peer delivery systems, each user downloads a video stream and at the same time uploads the same stream to other users. In live streaming, scalable video streaming is also proposed to allow partial ...
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ISBN:
(纸本)9781479966646
In advanced Peer-to-Peer delivery systems, each user downloads a video stream and at the same time uploads the same stream to other users. In live streaming, scalable video streaming is also proposed to allow partial decoding of the video streaming at a reduced resolution, frame-rate or quality, adapting to different display requirements and receptions conditions of heterogeneous receivers. In live streaming applications, network coding (NC) has the potential to bring substantially higher throughput while reducing transmission delays. However, the bandwidth efficiency of NC transmission is still a problem to live media streaming due to the lack of synchronization among peers. To solve this problem, we introduce a scalable streaming system, which includes a layer selection algorithm and a distributed packet scheduling algorithm. The proposed system is tested by streaming a scalable video over a peer-to-peer network. The experimental results confirm that the proposed algorithm achieves better video quality, better delivery ratio, and lower transmission redundancy.
network coding has become increasingly popular in time efficient data dissemination due to its inherent nature of broadcasting multiple data items in encoded form through a single broadcast. However, not much attentio...
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ISBN:
(纸本)9781509017010
network coding has become increasingly popular in time efficient data dissemination due to its inherent nature of broadcasting multiple data items in encoded form through a single broadcast. However, not much attention has been put forth on the efficiency of network coding when accessed data items' sizes can vary. In this work, we have investigated that when clients' accessed data items are of different sizes, network coding based broadcast can no longer maintain its superiority over traditional broadcast. We have found the reason of this performance degradation of coding based broadcast and propose an efficient dynamic threshold based coding approach. The proposed approach can maintain its performance superiority over both traditional broadcast approach and conventional coding based approach under a range of different size accessed data items. Simulation results support our claim.
Existing finite field network coding (FFNC) can be applied in networks where all users have the same data rate and can thus use the same modulation type. In most practical scenarios, different users typically have dif...
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ISBN:
(纸本)9781509017010
Existing finite field network coding (FFNC) can be applied in networks where all users have the same data rate and can thus use the same modulation type. In most practical scenarios, different users typically have different data rates. With simple changes such as zero-padding and repetition to the data sequences of different users received at relays, it is still possible to employ the existing FFNC scheme, but the network throughput and error performance will be compromised. In this paper, we design a network coding scheme for multiuser multiple-relay networks where users' data rates are different. Specifically, we develop a layered network coding approach that allows the use of the existing FFNC for each layer in a hierarchical structure and derive the corresponding decoding process. The bit error (BER) and computational complexity of the proposed scheme are derived. Numerical and simulation results show that the proposed scheme achieves a better BER performance than the existing FFNC scheme.
network coding is a packet encoding technique which has recently been shown to improve network performance (by reducing delays and increasing throughput) in broadcast and multicast communications. The cost for such an...
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ISBN:
(纸本)9781479966646
network coding is a packet encoding technique which has recently been shown to improve network performance (by reducing delays and increasing throughput) in broadcast and multicast communications. The cost for such an improvement comes in the form of increased decoding complexity (and thus delay) at the receivers end. Before delivering the file to higher layers, the receiver should first decode those packets. In our work we consider the broadcast transmission of a large file to N wireless users. The file is segmented into a number of blocks (each containing K packets - the coding Window Size). The packets of each block are encoded using Random Linear network coding (RLNC). We obtain the minimum coding window size so that the completion time of the file transmission is upper bounded by a used defined delay constraint.
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