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Network coding is known as a promising approach to improve wireless network throughput. However, it is only applicable when different flows are routed through a certain coding structure. One of the fundamental issues is to accurately identify the coding structures and optimally utilize the coding nodes. In this paper, we formally establish general coding conditions to identify multiple coding nodes...
In this paper, an approach minimizing delivery latency, while keeping transmitted power below a certain threshold, is proposed to provide reliable real time wireless communications when applying network coding principle in order to point out additional advantage in terms of capacity. An analytical tool is proposed to derive the performance of optimal power adaptation scheme NC scheme aiming at minimizing...
In this paper, a cooperative system with two users and one relay is considered. An amplify-and-forward relaying protocol is applied in a half duplex mode. To make the transmission delay as short as possible, the relay forwards for both users simultaneously. We consider transmission schemes with symbol rates 2/3 to demonstrate the tradeoff among performance, delay, and symbol rate. Based on the analysis...
Network coding is an efficient technique to increase network capacity. COPE is a promising forwarding mechanism which can utilize network coding in a practical way. Different routing algorithms utilizing COPE may have different gains from network coding. In this paper, we discuss the importance of coding-aware routing and the tradeoff between load-balanced and coding-aware routing. We then propose...
We study joint network-coding and channel-coding design to optimize delay performance. In our systems, network codes (network layer) are on top of channel codes (physical layer). Network codes run in a rateless random method, i.e., source and intermediate nodes randomly produce and transmit codewords until transmission succeeds. Thus, the rateless network codes have block-erasure-correction capability...
This paper aims to optimize joint overall video quality and traffic performance of multirate multicast of scalable video streaming accessing hybrid wired/wireless paths. In order to guarantee layered utility maximization over tiered wired/wireless coded networks, we propose a joint source and network flow optimization scheme where each scalable layer is tailored in an incremental order and finds jointly...
The concept of bidirectional relaying shows the potential to improve the performance in wireless networks such as sensor, ad-hoc, and even cellular systems. It applies to three-node networks, where a relay node establishes a bidirectional communication between two other nodes. In the first phase of a decode-and-forward protocol, the two nodes transmit their messages to a relay node, which decodes...
There have been several approaches to provisioning traffic between core network nodes in Internet Service Provider networks. Such approaches aim to minimize network delay, increase capacity, and enhance security services. MATE (Multipath Adaptive Traffic Engineering) has been proposed for multipath adaptive traffic engineering between an ingress node (source) and an egress node (destination). Its...
We propose two classes of efficiently-encodable GLDPC (EE-GLDPC) codes by generalizing the ideas of IRA and EERC codes. These GLDPC codes have performance as good as ordinary GLDPC codes. Moreover, another advantage of these EE-GLDPC codes is that they are naturally suitable for puncturing. Simulation shows that, at code length around 600, the punctured EE-GLDPC codes can outperform optimized irregular...
This paper studies the power consumption performance and resource allocation optimization in wireless video sensor networks. Network coding based multipath routing, network flow control and video encoding bit rate are jointly optimized, aiming to maximize the network lifetime at a given power budget and video quality requirement. Importantly, to concretely measure the network coding power utilized...
Network coding has been proved as an effective way to enhance the throughput of the multihop wireless ad hoc networks in both unicast and multicast traffics. However, in a random network topology with non-coding-aware routing protocols, the performance enhancement may be limited because the packet routing scheme does not take advantage of the possibility of network coding. In this paper, we propose...
We consider the joint channel and network code design for a half-duplex 4-node multiple-access relay system with two sources, one relay, and one destination. The relay combines the information from both sources and transmits it to the destination together with both sources. We consider two network coding schemes for information combining at the relay, namely, the superposition coding (SC) and the...
Luby Transform (LT) codes are becoming increasingly important in transmission due to the ability to protect the source data in high reliability economically. LT codes generate rateless packets on-the-fly through randomly chosen encoding degree, so it cannot control or manage the service quality according to distinct service demands of clients. In this article, we extended LT codes with a service-driven...
A single-source network is said to be memory-free if all of the internal nodes (those except the source and the sinks) do not employ memory but merely send linear combinations of the incoming symbols (received at their incoming edges) on their outgoing edges. Memory-free networks with delay using network coding are forced to do inter-generation network coding, as a result of which the problem of some...
Loss tomography aims to infer link loss rates using end-to-end measurements. We investigate active loss tomography on mesh topologies. When network coding is applied, based on the content of the received probe packet, a receiver should distinguish which paths have successfully transmitted a probe and which paths have not. We establish a lower bound on probe size which is necessary for obtaining such...
Peer-to-peer (P2P) technology has become an attractive approach for enabling large-scale video streaming applications, but the factor of users' subjective preferences is usually ignored in such networks. As users have different demands on video quality, we have proposed several schemes, to address the design challenge of providing all users uninterrupted video with their desired qualities in case...
Routing in delay tolerant networks (DTNs) in which most of the nodes are mobile and intermittently connected is a challenging problem because of unpredictable node movements and lack of knowledge of future node connections. To ensure reliability against failures and increase the success rate of delivery, erasure coding technique is used to route messages in DTNs. In this paper, we study how the cost...
Existing network coding schemes such as COPE require exchange of information among neighboring nodes in order to correctly encode and decode data packets. However, this leads to high packet overhead and degrades system performance more especially when network traffic is high. Therefore, in this paper, we propose a new adaptive W scheme whose objective is to adaptively control waiting time of overheard...
In this work we provide an achievable rate region for the cellular downlink with three users where two users want to communicate with each other. Due to the side information from the prior uplink, gains are achievable by combining bidirectional and classical broadcast channel coding strategies. A coding theorem for the bidirectional broadcast channel with random state non-causally known at the encoder...
The technique of distributed storage coding has been widely used in wireless sensor networks for increasing the robustness of data storage and efficiency of data retrieval. Existing works mainly focus on scenarios in which each storage node stores a linear combination of a subset of K data packets generated by different source nodes. By solving the linear equations, a collector can recover all the...
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