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Although, it was shown that NC is a promising technique to improve the throughput; especially for multicast environment; it also bears negative side-effects (e.g., high decoding delay). Since streaming video are usually subject to strict delay constraints, high decoding delay must be resolved to enhance the performance of the NC schemes. To overcome this issue, this paper presents a new scheme named...
While buffer-aided relaying improves the diversity of a multi-hop network, its deployment introduces time-delays, thus rendering buffering unreliable for delay-intolerant applications. To alleviate excessive delays, various studies propose delayaware protocols, but at the expense of reduced diversity, and consequently, increased outage probability. Attempts to maintain the diversity of the system...
Exploiting multi-user diversity (MUD) means to assign the resources to the user experiencing the best channel conditions. When multicast communication is considered, MUD means that a sender can serve the intended receiver users using one or many data transmission rates. In fact, MUD-based multicast schemes aiming to maximize the multicast throughput (e.g. DOMS and MOST) or to minimize the multicast...
Communications Operations Procedure-1(COP-1) is widely used for reliable transmission of telecommand data for space missions. This paper focuses on the delay performance of COP-1 protocol over long and lossy link. The typical work conditions and process are studied combined with the characters of both the link and the transmission task. Based on the analysis of the procedure, the quantificational...
Topology control is one of the key technologies in ad hoc network. Recently some topology control algorithms focus on reducing the end-to-end delay have been proposed. However, they do not consider the delay which is caused by contending for the shared channel and collision at MAC layer. In this paper, we put forward a new delay model to character the link delay which is composed by the transmission...
Mostly real time applications want rapid data transmission in the network. The performance can be ensured by mechanisms which gives performance by shaping and policing of packet traffic. Further improve the performance of the network by fair allocation of resources. Many congestion control techniques provide good fairness and throughput, which decreases the loss of packet. We have analyzed the strength...
Sharing Transmission Opportunity period (TXOP) technique is recently defined by IEEE 802.11ac to allow simultaneous downlink transmissions. In this paper, we focus on the basis of this technique and the behavior of the access point (AP) to manage the multi-user access. We discuss the different steps required to allow simultaneous downlink transmissions. Based on simulation results, we prove that TXOP...
Underwater acoustic communications can be used for several applications. When the underwater link is related to a reservoir, applications can go from water monitoring, both in terms of pollution and physical characteristics, as for example, temperature. Another class of applications can be the remote control of small vehicles/vessels. Due to the limited depth, this kind of underwater acoustic connection...
A Mobile Ad-hoc networks (MANETs) is composed of Mobile Nodes without any fixed infrastructure. Multicast routing in mobile Ad-hoc networks (MANETs) have many defiance due to implicit characteristics of the network such as node mobility, reliability, finite network resources etc. So, in this paper we have introduced a new scheme to improve the performance and efficiency of multicast routing protocols...
Delay, guaranteeing causality, is inevitable in cooperative communication systems. Traditionally, delay granularity has been limited to one symbol; however, channel delay is in fact governed by channel memory and can be shorter. For example, the delay requirement in orthogonal frequency-division multiplexing (OFDM), captured in the cyclic prefix, is typically much shorter than the OFDM symbol itself...
In this paper we provide a review for the time domain analysis of the normalized timing error dynamics of a wireless receiver Early-Late tracking loop (A loop that controls the timing of a pseudo-noise code that is locally generated in the receiver). This review shows that the timing error dynamics modelling is cumbersome and can be simplified by linearizing the tracking loop. The linearization assumption...
Future wireless standards such as 5G envision dense wireless networks with large number of simultaneously connected devices. In this context, interference management becomes critical in achieving high spectral efficiency. Orthogonal signaling, which limits the number of users utilizing the resource simultaneously, gives a sum-rate that remains constant with increasing number of users. An alternative...
Exploiting multi-user diversity (MUD) for multicast consists in choosing the data rate(s) utilized to serve a number of users who have different channel qualities. Some of the proposed multicast schemes aim to maximize the throughput (e.g. EMTH), while others seek to reduce the transmission time (e.g. EMTT). Actually, it is well known that the process of computing the accurate MUD multicast throughput...
In this paper we propose the introduction of adaptive hybrid automatic repeat request (HARQ) in the context of mobile satellite communications. HARQ schemes which are commonly used in terrestrial links, can be adapted to improve the throughput for delay tolerant services. The proposed method uses the estimation of the mutual information between the received and the sent symbols, in order to estimate...
Cloud computing is becoming commonly used for enterprise systems. Users utilize WAN, the Internet, or a wireless network to access the cloud service. These networks often have large RTT and packet loss ratios (PLR), so if users communicate via TCP widely used for accessing cloud services, the throughput decreases and the access quality of the cloud service deteriorates. Therefore, much TCP acceleration...
Wireless Sensor Networks (WSNs) are of great interest to researchers due to their various applications in areas such as environmental monitoring, process monitoring and tracking surveillance systems. Sensors are deployed in hostile in random fashion giving self-organized topology. Medium Access Control (MAC) plays a vital role in the power saving mechanism of WSNs. MAC schemes for WSNs are different...
The focus of the present research is to design a receiver circuit for high speed and high throughput data transmission over the interconnect line. This is achieved using current mode signaling in interconnects. In the present paper an efficient receiver for current mode interconnect system is proposed. The analysis shows that the proposed receiver has 26.65% lesser latency at room temperature for...
In this paper, we study the problem of user pairing algorithms for uplink virtual multiple-input multiple-output (V-MIMO) networks, with Quality of Service (QoS) considered. After analyzing the transmission model and delay model, we propose a balanced QoS and proportional fair (B-QPF) algorithm of user pairing, which selects users depending on proportional fair (PF) criterion and the instantaneous...
We present Duo-MAC, an asynchronous cascading wake-up scheduled MAC protocol for heterogeneous traffic forwarding in low-power wireless networks. Duo-MAC deals with energy-delay minimization problem and copes with transmission latency encountered by Today's duty-cycled protocols when forwarding heterogeneous traffic types. It switches, according to the energy and delay requirements, between Low Duty...
Receiver-based MAC (RB-MAC) is a preamble-sampling MAC protocol for WSNs in which a receiver node is dynamically elected, among potential neighbors of the sender node, based on current channel conditions. In this paper, we evaluate the performance of RB-MAC and compare it with a sender-based preamble-sampling MAC protocol by using analytical methods, and implementation in real sensor nodes. We have...
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