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We investigate adaptive transmission for tactical packet radio networks in which a source uses fountain coding to multicast a file to a number of destinations over time-varying links. We examine two strategies from the literature for packet-by-packet adaptation of the modulation and channel code. The maximum data-recovery rate philosophy attempts to maximize the throughput for each transmitted packet...
In this paper, we focus on the problem of collision in tags identification in RFID systems. We propose tree algorithm with single error bit tracking that utilizes Manchester coding to know the position of collision bit among the ID of the tags. The reader broadcasts the Query bit that is updated in every collision. The update is done according to the position of the collision bit that allows to reduce...
Multi-path TCP has recently shown great potential to take advantage of the rich path diversity in data center networks (DCN) to increase transmission throughput. However, the small flows, which take a large fraction of data center traffic, will easily get a timeout when split onto multiple paths. Moreover, the dynamic congestions and node failures in DCN will exacerbate the reorder problem of parallel...
This paper presents a comprehensive cross-layer analysis framework on the performance of transmission control protocol (TCP) over free-space optical (FSO) links, which employ the automatic repeat request (ARQ) and adaptive modulation and coding (AMC) schemes. From the framework, we quantify the impacts of different parameters/settings of ARQ, AMC and FSO links on TCP throughput performance. We also...
This paper provide the performance comparison of the IEEE 802.11n and IEEE 802.11ac Wireless Local Area Network (WLAN). The IEEE 802.11ac protocol currently has been used widely. Network Simulator (NS-3) is used to simulate it. The advantages of the research using Network Simulator are shorter time to explore, low cost and flexibility on scenario developed. Our project analyzes and compares the 802...
Cooperative communication system is not able fully to solve the problems all about multipath fading, there are many parameters to decrease signal level to the receiver. The author brings the solution to embedded with network coding, this paper focus to enhance research about cooperative with network coding (CNC), using transparent protocol i.e amplify-and-forward (AF) with BPSK and QPSK modulation...
In this paper, we are interested in the optimal redistribution of the available budget in average transmit power per packet among potential packet transmission attempts for improved Automatic Repeat reQuest (ARQ) protocol. A conventional ARQ protocol was combined in [5], with both Adaptive Modulation and Coding (AMC) and Power Control (PC) to improve spectral efficiency, while satisfying an average...
Due to the exploding evolution of wireless communication systems, energy efficiency (EE) becomes the concern of many researches. In this context, we examine this metric into multiband orthogonal frequency division multiplexing ultra wideband (MB-OFDM UWB) systems. Indeed, the focus is about investigating a cross-layer design based on the joint combination between data link layer through the hybrid...
In this paper, we present a throughput optimized cross-layer design for multiple-input multiple-output (MIMO) wireless systems. The proposed design efficiently combines power control (PC), adaptive modulation and coding (AMC) and MIMO technology at the physical layer, with an automatic repeat request (ARQ) protocol at the data-link layer. Both basic ARQ and type-I hybrid ARQ are considered. More specifically,...
The recently proposed Glossy protocol demonstrated the high potential of constructive interference (CI) in improving communication performance in wireless sensor networks. This paper presents a network flooding protocol, Ripple, which also exploits CI while improving Glossy in terms of throughput and energy efficiency by a factor of three each. To this end, we propose to pipeline transmissions on...
Cognitive networks rapidly proliferating into all aspects of computing and communication. Some of them are specially designed for the people with specific ability. However, very few are designed with assistance of the people with disability and elderly who need help during networking. The goal of this project is to study network accessibility issues and their impact in such cognitive network design...
It has been recently observed that some information can be extracted from the received signal by the reader when the tag collision happens. Using the radio cross section (RCS) technique one can determine how many tags are backscattering simultaneously. Motivated by this technique we introduce the new notion of singulation code. In a singulation code, any two collection of codewords, of size up to...
We present some preliminary results from our investigation of two forms of erasure-correction coding, fountain coding and network coding, when they are employed for file transfers in a distributed packet radio network. The radios adapt the modulation and channel coding of the transmitted signals in response to variations in fading on the links of the network. The control information for the adaptive...
It has been recognized that using network coding improves the reliability and throughput of lossy wireless sensor networks (WSNs). Likewise, it is known that using multi-channel networking protocols can dramatically reduce end-to-end latency and improve throughput. However, to date there has been virtually no research as to how to combine these two techniques in a WSN. This paper presents MuCode,...
We present our initial findings in the investigation of an adaptive protocol for relaying of information in tactical packet-radio networks. Our protocol employs fountain codes to facilitate a relaying scheme involving two relays for improved throughput. In addition, the protocol adapts the modulation format and error-control code for each packet transmission in response to the time-varying propagation...
Packet losses in wireless networks dramatically curbs the performance of TCP. This paper introduces a simple coding shim that aids IP-layer traffic in lossy environments while being transparent to transport layer protocols. The proposed coding approach enables erasure correction while being oblivious to the congestion control algorithms of the utilised transport layer protocol. Although our coding...
This paper deals with the retransmission protocol design for cognitive radio networks by exploiting the primary hybrid ARQ. In contrast with previous work that focuses on cancellation based retransmissions, we propose a novel cooperative coding based retransmission protocol for cognitive radio networks. The design objective is to improve the throughput of the primary user and create the transmission...
Network coded opportunistic routing (NCOR) is a potential communication paradigm in wireless multi-hop networks (WMN) with lossy links. It leverages the multipath diversity of wireless networks and applies network coding to resist random erasures. Related optimization work minimizing transmission cost or maximizing throughput are based on the collision-free assumption, which either requires perfect...
Covert channels enable communicating parties to exchange messages without being detected by an external observer. We propose a novel covert channel mechanism based on BitTorrent trackers. The proposed mechanism uses common HTTP commands, thus having the appearance of genuine web traffic and consists of communications that are both indirect and asynchronous: no messages are directly exchanged between...
Transmission control is an important issue in the Internet or other computer networks today. The retransmission scheme in TCP cannot have the best throughput in the network scenarios with more wireless links or complicated topologies. Some related works proposed the solution by network coding. Network coding is suitable for generate the redundant data for error correction. In this paper, we discussed...
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