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This project aims to improve the throughput, energy consumption and overhead of vehicular ad hoc network (VANET) by optimising the network coding (NC) using Genetic Algorithm (GA). VANET shows a promising technology as it could enhance the traffic efficiency and promote traffic safety on the road systems. The conventional store-and-forward transmission protocol used in the intermediate node(s) simply...
This paper proposes Raptor codes-structured wireless super-dense networks serving a massive number of users with passive nodes constructing a precode of Raptor codes for future wireless networks. Passive nodes do not have their own information and only forward information from the neighboring nodes to the destination node. Similar to the capability of precode of Raptor coding scheme to protect information...
Network coding has shown the promise of significance throughput improvement. In this paper, we study the throughput of two-hop wireless network coding and explore how the maxi-mum throughput can be achieved under a random medium access scheme. In this paper, the problem of the performance of COPE type network coding under dual source coding architecture is solved. An Embedded Markov Chain Model for...
This paper considers the problem of designing maximum distance separable (MDS) codes over small fields with constraints on the support of their generator matrices. For any given m χ n binary matrix M, the GM-MDS conjecture, due to Dau et al., states that if M satisfies the so-called MDS condition, then for any field F of size q ≥ n + m − 1, there exists an [n, m]q MDS code whose generator matrix G,...
Multiuser cooperative communication is a new communication paradigm that allows multiple source node transceivers data to destination node. Network coding (NC) has been proved to provide significant performance improvement for cooperative communication in wireless networks (WNs). Sliding window-based network coding is a variation of NC that is an addition to data streaming and improves the data delay...
In this paper, we propose a network coding solution to improve transmission reliability of scalable video coding (SVC) streams over lossy networks. Since scalable video coding produces various levels of quality with variable bitrates, we design a prioritized network coding scheme combining different encoding approaches: generation-based and sliding window based schemes. We carried out a performance...
In this work, we propose an auction-based resource negotiation for flexible video traffic offloading over heterogeneous wireless networks. The goal of the proposed system is to alleviate long term evolution (LTE) traffic congestion by offloading video traffic through WiFi network in a flexible scale while providing stable video streaming services to users with the minimum monetary cost. The fountain...
It is known that attempts to find Barker sequence for m>13 decisions do not have. Thus, Barker sequence can be used only for signals with a relatively small base. Therefore actual is development of algorithm of construction of Barker sequence for m>13 on the basis of numerical bundles.
In this paper we proposed the method of correcting codes formation based on Residue Number System. The proposed method provides the formation of RNS correcting codes of the input data which is represented in a positional notation.
Due to asynchronous packet transmissions and rate mismatch among different coding flows in existing opportunistic network coding architectures, such as COPE, the amount of packets which can be coded together may be insufficient and thus the performance gain of network coding cannot be fully exploited. One feasible solution for this problem is to make coding nodepurposely delay some packet transmissions...
One of the most important solutions for spectrum shortage, expected by 2020, is wireless networks with super density, which is also expected to provide significant economic impacts. This paper proposes decoding scheme with practical analysis for massive number of users in super-dense wireless networks involving two multiway relays (SD-MWMR). The practicality is viewed from the point of finite-length...
Network coding (NC) enables us to mix two or more packets into a single coded packet at relay nodes and improve performances in wireless networks. Intra-session sliding window network coding is used at the source nodes and inter-session network coding is employed at the relay node to combine the recovered source packets of source nodes. In this paper, we investigate the performance of the network-coded...
In wireless networks, determining the error bit positions within a packet at the receiver can improve the wireless retransmission efficiency in wireless communications. In this paper, we propose an Error Position Estimating Coding (EPEC) scheme based on Error Estimating Coding (EEC). Specifically, we divide data bits into several groups and indicate the group number individually to implement error...
The issue of energy efficiency for processing multirate signal for wireless sensor network with the aim of increasing channel capacity and delay improvement is addressed. Different types of coding and modulation techniques are used to choose devices from different transmission rates. In a multichannel network the selection of link rate is difficult. In this paper we tried to focus on solution of link...
We consider an ultra-dense wireless network with multiple sources and multiple relays which forward quantized signals via some fronthaul network to some destination point. We discuss the loss of information at the relays due to the quantization process, and the trade-off between this loss and the load on the fronthaul network. We consider the application of a modulo operation to reduce the cardinality...
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...
It has been shown in the literature that Network Coding (NC) can boost the performance of wireless networks. However, to really obtain the potential gain of NC, efficient Medium Access Control (MAC) protocols that operate with awareness of the NC functions are necessary. In this paper, we propose a novel NC-aware MAC protocol for IEEE 802.11 wireless networks that combines k-batch transmissions and...
This paper presents OBN, a universal opportunistic ad hoc networking model particularly intended for smart mobile devices. It enables fast and lightweight data dissemination in wireless community networks through the utilization of universally-available wireless network identifiers. As a ubiquitous alternative to the publicly-limited ad hoc networking interfaces, it resolves many of the peer-to-peer...
The main aim of this paper is to improve the wireless system recital. Though there are many safeties measure hinder its wide use in common. Also the well-known pollution attacks, here is one more stern hazard, that of wormhole attacks, which weaken the recital increase of network coding. Because the fundamental uniqueness of network coding systems is diversely different from usual wireless networks,...
Wireless ethernet is one of the most important wireless technology that enhances our personal environment, either work or private, by means of networking or a variety of personal and wearable devices within the space and with the outside world. It refers to a link layer protocol in the TCP/IP (Transmission Control Protocol/Internet Protocol) stack, describing how networked devices can format data...
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