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Abstract-The performance of fast link adaptation (FLA)algorithms in wireless local area networks (WLANs) is affected by the delay of the modulation and coding scheme (MCS) feedback information. In this paper, a novel FLA strategy is shown to be able to cope with expired MCS information. This strategy relies on a timeout-based mechanism that weights down the importance of the MCS feedback information...
ECG signals received from a long distance call through mobile phone network need to be displayed instantaneously, smoothly and recorded. Due to non-uniform load and inherent time delay in the network the real-time display is incoherent. This will cause some discomfort or inaccuracies in observing the waveform at the critical moment, and then more or less affect the quality of work performed by the...
Multipath routing has been proved effective in mobile ad-hoc networks (MANETs) for coping with link failures resulting from node mobility. In wireless mesh networks (WMNs) where routers are generally static, the traffic carried by the backup paths may adversely impact other flows and the multicast group itself, because these paths increase the number of transmissions and thus the level of interference...
The hidden terminal problem in wireless sensor network (WSN) is one of the main causes of collision. Even though RTS/CTS handshaking has been implemented in CSMA/CA standard to alleviate the problem, it does not solve the collision completely. Moreover, it induces an issue called false blocking problem. Unaware of a busy status of a hidden receiver, adjacent nodes which can be potential senders will...
Throughput and per-packet delay can present strong trade-offs that are important in the cases of delay sensitive applications. We investigate such trade-offs using a random linear network coding scheme for one or more receivers in single hop wireless packet erasure broadcast channels. We capture the delay sensitivities across different types of network applications using a class of delay metrics based...
We consider stored content being streamed to a resource-poor device (such as a sensor node or a mobile phone), and address the issue of authenticating such content in realtime at the receiver. Per-packet digital signatures incur high computational cost, while per-block signatures impose high delays. A Merkle hash tree combines the benefits of the two by having a single signature per-block (at the...
A number of routing schemes have been proposed for intermittently connected mobile networks. In these schemes, a node carries a message and forwards the message to another node that it meets. To increase the delivery success rate, typically, multiple copies of the message are created and forwarded to multiple neighbor nodes. The neighbor nodes are selected based on such criteria as the probability...
Single Frequency Network (SFN) is widely deployed for digital video systems, not only for classical Single Input Single Output (SISO) systems like DVB-T, but also for the latest Multiple Input Single Output (MISO) DVB-T2 system. In this paper, we propose one scheme to measure the echo power and echo delay accurately in an SFN with OFDM technology, for both pre-echoes and post-echoes, even with long...
In this contribution, we introduce an interference alignment scheme that allows the coexistence of an orthogonal frequency division multiplexing (OFDM) macro-cell and a cognitive small-cell, deployed in a two-tiered structure and transmitting over the same bandwidth. We derive the optimal linear strategy for the single antenna secondary base station, maximizing the spectral efficiency of the opportunistic...
It has been shown that due to its smaller signal bandwidth (96 KHz), DRM+ signal could suffer from flat fading degradation at low receiver speeds, particularly in urban environments. To alleviate this problem, a simple transmit delay diversity (TDD) has been proposed in the standard. This paper tries to investigate this issue by presenting the performance results of multipath fading characterizations...
This paper addresses the problem of indoor location for devices that are connected to WLAN. Nowdays most of the smart terminals: mobile phones, portable computers and tablets are WLAN enabled. Location of these devices is of interest to network security issues as well as employee and company security and reliability. Most of the algorithms on the market use triangulation as a basic rule for location...
This paper proposes new robust asynchronous interfaces for GALS-systems. A combination of delay-insensitive and error detecting/correcting codes is used to achieve two types of robustness: variation-tolerance and fault-tolerance. Concerning the delay-insensitive code this paper targets the well-known 4-phase dual rail code, frequently used in asynchronous circuit design. In order to enable an optimal...
Incast applications have grown in popularity with the advancement of data center technology. It is found that the TCP incast may suffer from the throughput collapse problem, as a consequence of TCP retransmission timeouts when the bottleneck buffer is overwhelmed and causes the packet losses. This is critical to the Quality of Service of cloud computing applications. While some previous literature...
Efficient data dissemination to a fixed number of receivers in VANET is a new issue and is challenging considering the dynamic nature of VANET. We aim to accurately control the number of receivers, achieve low dissemination delay and incur only small communication overhead. To achieve the goal, we design DOVE (Data Dissemination to A Fixed Number of Receivers in VANET) inspired by processor scheduling,...
The recent introduction of 35-nm gate length InP MMIC low-noise amplifiers has enabled significant advances in Earth remote sensing. These low-noise amplifiers achieve 2-dB and 3-dB noise figure at 180 GHz and 90 GHz, respectively, at room temperature. For Earth remote sensing using ocean surface altimeters, the design of new millimeter-wave radiometers is motivated by the fact that these missions...
To improve safety, a warning message in VANETs should be delivered both reliably and urgently. Existing solutions either tend to compromise propagation delay or do not reach high reliability due to broadcast storm problem caused by excessive retransmissions. We propose ReC, which exploits geographical information to help nodes autonomously achieve agreement on forwarding strategies. Each forwarding...
Although there have been a plethora of studies on TCP performance in supporting of various applications, relatively little is known about the interaction between TCP and BGP, which is a specific application running on top of TCP. This paper investigates BGP's slow route propagation by analyzing packet traces collected from a large ISP and Route Views Oregon collector. In particular we focus on the...
Single Frequency Networks (SFNs) are often deployed for their optimal frequency reuse and the more homogeneous distribution of the field strength in the covered area. Different methodologies have already been proposed to calculate the so-called SFN gain over Multi Frequency Networks (MFNs), but so far, the influence of (MFN) handover mechanisms on the gain values has not yet been investigated. Also,...
During the recent years, broadcasting services and mobile services have started converging and it is expected that this trend will continue with other services. In order to deploy efficient solutions for the transport of MPEG media in an interoperable fashion, especially given the recent increased demand of multimedia delivery in the heterogeneous network environment, MPEG has launched a new standardization...
Transmission Control Protocol (TCP) carries the maximum Internet traffic, so performance of TCP largely affects the performance of Internet. However, end-to-end throughput in TCP degrades notably when operated in wireless networks, since random packet losses and packet reordering are considered as congestion. In wireless networks, due to high bit error rate and changing level of congestion, retransmission...
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