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Network coding is a technique used to improve both wired and wireless networks' throughput and provide reliable transmission. In network coding, original data packets can be encoded to an infinite number of coded packets. A subset of these coded packets is sufficient to decode the coded packets and retrieve the original data. In addition to providing reliable data transmission, network coding can...
These days we are witnessing a tremendous increase in the popularity of wireless devices, e.g. smartphones and tablets. These devices are typically connected to the Internet through cellular connections, such as LTE/4G. Because of the popularity of the wireless devices, a large portion of the traffic on the Internet goes through the cellular base stations. Caching the contents at the base stations...
In this paper, the performance of network codingbased gossip algorithms -- i.e. algebraic gossip algorithms -- is analyzed on random geometric graphs under static and mobile environments. The lower bounds for the convergence time of algebraic gossip algorithms are derived based on the conductance, and these bounds are O(n log n log ε -- 1 -- log n log ε -- 1) with node...
Network coding is a technique which can be used in wired and wireless networks to increase the throughput of the networks and provide reliable transmissions. Also, it can be used in distributed storage systems to store large data on different storages and provide fault tolerance against storage failures. Using network coding, the set of packets that form a file can be encoded to an infinite number...
One of the main challenges in wireless networks is addressing the unreliability of the wireless links, and providing reliable transmissions. Two important sources of errors in wireless transmissions are noise and interference. In order to address the errors due to noise, forward error correction methods can be used, in which redundancy is added to the packets to detect and correct the bit errors....
Ubiquitous and resilient Internet connection access is becoming a necessity of life. Moreover, the amount of data requested by mobile users is increasing rapidly. Cooperative mobile Internet access is a promising approach to addressing these demands, by giving the mobile devices the opportunity to use the help of other devices to access the Internet. The helpers can download the data requested by...
As the popularity of wireless devices (e.g. smartphones and tablets) increases, watching videos over the Internet is becoming a main device application. Two important challenges in wireless communications are the unreliability of the wireless links and the interference among the wireless links. In order to exploit reliable video multicast, forward error correction and network coding can be used. In...
It has been proved that network coding can optimize routing in wireless networks. Thus, in deterministic routing, coding is considered as an important factor for route selection. While the existing deterministic routing solutions detect paths with coding opportunities based on the two-flow coding, little attention has been drawn to the multi-flow situation. Coding multiple flows directly, however,...
Client diversity is one of the main characteristics of wireless networks. Due to channel diversity, multicasting a video stream in a wireless LAN to multiple clients with different channel conditions is a challenging task. A promising approach for such a problem is to use multiresolution video coding (i.e. scalable video coding) with network coding. In this paper, we study a triangular approach for...
Network Coding (NC) techniques have received a lot of attention from the research community for providing reliable broadcasting in error-prone wireless networks. The most common NC approach is segment coding, in which the packets are partitioned into segments, and linear NC is performed inside each segment. In order to increase the throughput of NC and decrease the decoding delay, dynamic coding schemes...
Providing reliable transmission over error-prone networks has received a lot of attention from the research community. In this paper, instead of using simple retransmissions to provide reliability, we consider a novel retransmission approach based on the importance of the bits (symbols). We study the problem of maximizing the total gain in the case of partial data delivery in error-prone wireless...
Video is one of the main causes of the dramatic increase in data traffic over cellular networks. Caching is an effective mechanism that decreases the download rate from base stations and, as a result, the load on the base station, by storing the most popular files or videos on the caches and providing them to the users. The problem of efficient content placement on the caches is known as an NP-complete...
Broadcasting with network coding mixes different packets to minimize the number of transmissions, which improves the energy efficiency of wireless networks. On the other hand, delaying the transmissions increases coding opportunities at the intermediate nodes, but increases the delay of the packets. In this paper, we consider these two contradicting factors and study the problem of minimizing the...
Recent research has shown that the performance of opportunistic routing and network coding in wireless networks is greatly impacted by the correlation among the links. However, it is difficult to measure the correlation among the links, especially because of the time-varying behavior of the wireless links. Therefore, it is crucial to design a distributed algorithm that does not require the explicit...
The broadcast nature of wireless links makes wireless networks an attractive environment for intersession network coding. Most intersession network coding protocols exploit this property, but ignore the diversity among the links by turning off coding when the channels are lossy. Other protocols deal with the packets separately - not as members of flows - which makes the intersession network coding...
In this paper, we consider the issue of efficient broadcasting in mobile ad hoc networks (MANETs) using network coding and directional antennas. Network coding-based broadcasting focuses on reducing the number of transmissions each forwarding node performs in the multiple source/multiple message broadcast application, where each forwarding node combines some of the received messages for transmission...
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