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Opportunistic data forwarding has proven to be a powerful technique to achieve a high throughput in wireless mesh networks. It proactively utilizes the link quality variation rather than fighting it. In this article, we propose a time-based coordination scheme of opportunistic forwarding, dubbed ExOR Compact, that uses network coding to provide a reliable data transfer service at the network layer...
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...
We consider the problem of physical-layer network coding when the channel exhibits block fading. Specifically, we focus on the use of lattice codes in a compute-and-forward framework for realizing physical-layer network coding. We construct a novel lattice ensemble called the root-Low-Density Construction-A (root-LDA) ensemble which uses Construction A with root-low-density parity check (LDPC) codes...
Overlapped chunked (network) codes are variations of random linear network codes with low computational cost and small coefficient vector overhead, where the source node groups the input packets into chunks with overlapping and the intermediate network nodes only apply linear network coding among packets belonging to the same chunk. In this paper, we introduce a repetition Tanner graph representation...
Mobile cloud applications have become extremely popular in the last years. Location-based services, navigation, online gaming and social networking are a representative set of “always on” cloud applications in which the same or partially overlapping content is delivered to multiple users. Network coding is a well matching solution to improve content delivery. In this paper we propose the vNC-CELL...
Random Linear Network Coding (RLNC) is a technique that provides several benefits. For instance, when applied over wireless mesh networks, it can be exploited to ease routing solutions as well as to increase the robustness against packet losses. Nevertheless, the complexity of the decoding process and the required overhead might jeopardize its performance. There is a trade-off when deciding the field...
Network coding has been introduced as a new paradigm for network routing protocols in recent years. The wide range of advantages of network coding, such as energy saving, throughput improvement and congestion mitigation, have been demonstrated in many practical systems. However, the nature of packet mixing, optimization of forwarding nodes selection cause the network coding based routing protocols...
Network coding improves transmission efficiency by combining packets at relay nodes and thus reduces the number of packets sent to the network. It is a network layer solution to improve network throughput and transmission efficiency. However, a coded packet must be decodable by the destination, otherwise it is a waste of resource to combine them together and to deliver the coded packet. This paper...
This paper studies the technique of bit-interleaved coded modulation with iterative decoding (BICM-ID) in a two-way relaying communication system. Iterative decoding based on the quaternary code representation is adopted at the relay for the multiple access (MA) phase. An upper-bound of the bit error probability (BEP) under the error-free (EF) feedback assumption for BICM-ID in the MA phase is obtained...
In this paper, we consider a multiple-access broadcast channel (MABC) with ARQ feedback, in which M endusers wish to exchange messages with a central node or basestation. 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...
Physical-layer network coding (PNC) can potentially boost the throughput of a two-way relay network by 100% compared with conventional packet forwarding schemes. However, the complexity of PNC channel decoders can be considerably higher than the complexity of channel decoders for point-to-point communication systems. Although many PNC channel decoders proposed to date have good decoding performance,...
In infrastructure-lacking environments, like military areas of operation, the intermittent availability of backhaul networks leads to greater reliance on peer to peer data exchange. In such settings, mobile nodes use Delay Tolerant Network (DTN) protocols for exchanging location specific data. High transmission delay, packet loss and intermittent connectivity increases the need for efficient data...
While feasibility and obtaining a solution of a given network coding problem are well studied, the decoding procedure and complexity have not garnered much attention. We consider the decoding problem in a network wherein the sources generate multiple messages and the sink nodes demand some or all of the source messages. We consider both linear and non-linear network codes over a finite field and propose...
In this paper, we consider a fully connected device-to-device communications network, where a group of devices with heterogeneous channel capacities cooperate with each other to recover their missing packets. In such cooperative network, we aim to minimize the completion time required for recovering all missing packets at devices using instantly decodable network coding (IDNC). In particular, we first...
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...
In this paper, we address the problem of reducing the completion time of a radio access network to deliver a frame of messages using Rate Aware Instantly Decodable Network Coding (RA-IDNC). While previous works only considered a single base-station setting, this paper extends the results to a more modern paradigm of networks with multiple coordinated basestations. The different rates of the base-stations...
More and more Internet-enabled devices, such as server instances or smartphones, have multiple network interfaces. Multipath TCP (MPTCP) has proven to increase bandwidth for these devices, while remaining compatible with the existing network infrastructure and applications. For interactive applications and services, however, low latency and low jitter often is more important than bandwidth. In this...
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