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The exponentially increasing number of IoT devices makes the unlicensed industrial, scientific, and medical (ISM) radio bands (e.g., 2.4 GHz) extremely crowded. Currently, there is no efficient solution to coordinate the large amount heterogeneous IoT devices that have different communication technologies (e.g., WiFi and ZigBee). To fill this gap, in this paper, we introduce embedded multiple flows...
Although many works exist on the subject, the real impact of partially-overlapping channels (POCs) on the capacity of multi-radio wireless mesh networks is not clearly established yet. In this paper, we propose a mathematical programming model to evaluate accurately the improvement in throughput that could be achieved if all the adjacent radio channels were exploited. Compared to previous works, our...
Traditional financial trading systems were developed in database-based standalone model years ago. Given that there exist some evident drawbacks like high latency and low availability in such architecture, it is imperative to design a new model which can meet the requirements of time-sensitive financial transactions. Therefore, in this paper we design and implement a state-replication based matching...
In this paper, a simple variation of classical Slotted Aloha is introduced and analyzed. The enhancement relies on adding multiple receivers that gather different observations of the packets transmitted by a user population in one slot. For each observation, the packets transmitted in one slot are assumed to be subject to independent on-off fading, so that each of them is either completely faded,...
In this paper, we consider a two-tier communication scenario in an underwater sensor network. The field nodes form single-hop clusters around the gateway nodes and communicate with them via acoustic wireless links, while the gateway nodes communicate directly via radio frequency (RF) wireless links to the sink node. Thus, the field data is collected at the sink node via two-hop communication links...
The objective of this paper is to study the impact of advanced physical layer techniques on the maximum achievable throughput of wireless multihop mesh networks. We formulate a cross-layer optimization framework for the routing and scheduling problem jointly with the following physical layer techniques: successive interference cancellation, superposition coding, dirty-paper coding and their combinations...
In this paper, we present a multi-gate mesh network architecture that has been developed to ensure high performance and reliability under emergency conditions when a system expects to receive power outage notifications and exchanges. In order to handle the metering traffic, we introduce a back-pressure based scheduling algorithm, which takes into account both the hop-count, as well as the queue length...
In networks with very large delay like satellite IP-based networks, standard TCP is unable to correctly grab the available resource. To overcome this problem, Performance Enhancing Proxies (PEPs), which break the end-to-end connection and simulate a receiver close enough to the sender, can be placed before the links with large delay. Although splitting PEPs does not modify the transport protocol at...
This paper presents a new asynchronous design template using single-track handshaking that targets medium-to-high performance applications. Unlike other single-track templates, the proposed template supports multiple levels of logic per pipeline stage, improving area efficiency by sharing the control logic among more logic while at the same time providing higher robustness to timing variability. The...
In this paper, we present a review of automatic repeat request (ARQ) and hybrid ARQ (HARQ) mechanisms implemented or proposed in beyond 3rd generation (B3G) wireless systems based on OFDMA. In particular, we will focus on part of the IEEE 802.16 standard family (IEEE 802.16-2005, IEEE 802.16m) and on 3GPP Long Term Evolution (LTE). In the second part of this overview, some performance curves show...
Wired-cum-wireless networks are interconnected through proxy or gateway that acts as router and also caters for link MTU mismatch between the two networks. In IPv6 based networks, TCP is mandatory for bulk data transfer from wired to wireless host. This results in end-to-end TCP session through the default proxy. The single proxy supporting a large number of TCP sessions; is vulnerable to buffer overflow...
The m-out-of-n encoded asynchronous circuits are able to implement the truly delay-insensitive circuit operations, but they suffer from higher power dissipation due to the large amount of logic cells. Besides, the throughput of the circuits is also worse than the synchronous counterparts since the four-cycle handshake protocol requires inserting a ??NULL?? token between two adjacent valid data transmissions...
The fluctuations of the price of crude oil is pushing the oil companies to increase the investments in seismic exploration of new oil and gas reservoir. Seismic exploration requires a large number (500 divide 2000 nodes/sqkm) of sensors (geophones or accelerometers) to be deployed in outdoor over large areas (ges 20 sqkm) to measure backscattered wave fields. A storage/processing unit (sink node)...
It is well known that in dense mesh networks, CSMA-based MACs such as IEEE 802.11 achieve lower through-put than optimal spatial TDMA. This paper explores the degree to which the difference in throughput is partly due to a lack of channel usage information and the degree to which the difference is due to packet ordering. To this end, the throughput achieved by a large number of hypothetical MAC algorithms...
VLSI implementation for a 4times4 multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) transceiver is described that targets 1-Gbps data transmission for next-generation wireless LAN systems. The IEEE802.11 Very High Throughput (VHT) Study Group concluded that a signal bandwidth of more than 80 MHz is needed to achieve 1-Gbps throughput in the MAC layer. The proposed...
This paper studies TCPpsilas fairness issues in WSNs, and designs an improved congestion control algorithm based on the characteristics of the WSNs (Wireless Sensor Networks). The protocol is designed as extension to DCCP (Datagram Congestion Control Protocol) with a new congestion control component. We also implemented this congestion control algorithm in NS2. Simulation results show improvements...
Wireless mesh networks have been attracting significant attention due to its promising technology. It is becoming a major avenue for the fourth generation of wireless mobility. Communication in large-scale wireless networks can create bottlenecks for scalable implementations of computationally intensive applications. A class of crucially important communication patterns that have already received...
Network congestion control is a critical issue, especially in the growing size, demand, and speed (bandwidth) of the increasingly integrated services networks. Designing effective congestion control strategies for these networks is a challenge because of the complexity of the structure of the networks, nature of the services supported, and the variety of the dynamic parameters involved. Congestion...
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