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Interference has been proven to have an effect on the performance in wireless mesh networks (WMN). Using multichannels can improve the performance of WMNs by reducing interference influence. In this paper, we study how to design a robust WMN for a set of mesh nodes, each with Q Networking Interface Cards (NICs) and pre-defined connection requests. Our scheme aims to construct an interference-aware...
We propose a new cross-layer approach to mitigate interference in multihop networks. Precisely, we cancel all adjacent node interference in a multihop path by MIMO two-way relay scheme and jointly optimize the routing and power allocation to mitigate the interference from far nodes. We model and efficiently solve this optimization problem using a geometric programming framework. Our simulation results...
Multihop relaying in WiMAX networks is considered a cost effective way to extend the coverage of the base stations, increase cell capacity, or both. In this paper, we consider deploying non-transparent relay stations for coverage extension and study the issue of fairness schemes in such networks. Since there are access and relay zones in both downlink and uplink frames and simultaneous transmissions...
We consider robust receiver design in uncoded multiple-input multiple-output (MIMO) wireless communication systems. In practical systems, the channel state information (CSI) available at the receiver is often imperfect due to measurement errors, quantization errors and many other sources of errors. Consequently, using the erroneous CSI for decoding the transmitted symbols will significantly degrade...
Shannon's paper in 1948 has enticed researchers to explore the capacity of networks. Roughly two decades later, van der Meulen introduced relay channels and Cover introduced the idea of broadcasting and taking advantage of spatial diversity. Since then, numerous researchers have placed their focuses on different aspects of peer-to-peer networks. This paper covers three different bounds that deal with...
Advanced cellular networks are expected to use multihop transmission (relaying) in the cells for the connection between the users and the base station BS as well as for peer to peer connection between two users within the same cell. Therefore they become a mixture of cellular and ad hoc networks that will be referred to as cellular/ ad hoc or CAH network. We apply a conventional resource reuse scheme...
Wireless Mesh Networks (WMN) is an emerging wireless network infrastructure, which can provide inexpensive and reliable wireless broadband access services, therefore it has been widely adopted and researched. In a practical WMN, the number of radio interfaces is much more than the number of effective channels, which causes a lot of different links between Mesh routers to operate in the same channel...
This paper proposes FlashLinQ - a synchronous peer-to-peer wireless PHY/MAC network architecture for distributed channel allocation. By leveraging the fine-grained parallel channel access of OFDM, FlashLinQ develops an analog energy-level based signaling scheme that enables SIR (Signal to Interference Ratio) based distributed scheduling. This new signaling mechanism and the corresponding allocation...
This paper bears on the design and the quantitative evaluation of MAC mechanisms for wireless ad-hoc networks with performance guarantees. By this, we mean mechanisms where each accepted connection obtains a minimum rate or equivalently a minimum SINR level - which is not guaranteed by CSMA/CA - and which are adapted to the wireless ad-hoc network framework, namely are decentralized, power efficient...
Techniques for controlling the transmission power of mobile devices have been widely studied in MANETs and cellular networks. However, as mobile applications for WSNs emerge, the unique characteristics of WSNs, such as severe resource constraints, suggest that transmission power control should be revisited from a WSN perspective. In this work, we take an experimental approach to examine the effectiveness...
In this paper, we are interested in cognitive radio networks (CRNs) whose operation does not rely on channel sensing. A spectrum server is responsible for collecting spectrum availability and location information from primary radio networks (PRNs), and broadcasting this information to cognitive radios. By subscribing to this broadcast, a CR knows about the spectrum opportunities without sensing channels...
We introduce a new multiuser diversity concept with which multiple transmitters can communicate without causing significant interference to each other. The new scheme, called Opportunistic Interference Management (OIM), significantly reduces the feedback required in distributed Multiple-Input Multiple-Output (MIMO) systems, and requires an encoding and decoding complexity that is similar to that of...
The increased industrial interest in wireless sensor networks demands a shift from optimizing protocols for energy-efficient reporting of sporadic events to developing solutions for high-rate real-time data collection and dissemination. We study time-optimal convergecast under the communication constraints of commodity sensor network platforms, and propose a novel convergecast model in which packet...
In this paper, we study a cognitive coexistence strategy for heterogeneous networks. While a lot of previous works focused on spectrum underlay approaches for weak interference scenarios, a high power infrastructure (IS) transmitter creates a large dead zone for nearby ad-hoc (AH) links using the same spectrum. To address this problem, we propose to utilize a half-duplex decode-and-forward (DF) relay...
Traditional Cognitive Radio Networks aim to utilize the radio spectrum white space. We present a radically different approach which exploits the excess Signal-to-Noise ratios at which the primary network nodes operate. This paper introduces ProTOMAC (Proactive Transmit Opportunity Detection at MAC Layer), the first spectrum access paradigm that leverages the gray space present at the MAC layer via...
The capacity of wireless networks is greatly affected by the available information on network states, such as network topology, channel state, and traffic information. Previous research has estimated the capacity of wireless networks by assuming that each node in the network can obtain precise network information. However, in reality, precise network information may not be readily available, and it...
We propose using cooperative relaying technique in spectrum-sharing systems to more effectively and efficiently use the available transmission resources, such as power, rate and bandwidth, while adhering to the spectrum-sharing resource requirements of the licensed (primary) user. Specifically, we consider that the secondary user of the spectrum is assisted by a decode-and-forward (DF) relay to help...
Wireless Mesh Networking (WMN) is an emerging communication paradigm to enable resilient, cost-efficient and reliable services for the future-generation wireless networks. We study the minimum-latency communication primitive of gossiping (all-to-all communication) in known topology WMNs under physical interference model, i.e., where the schedule of transmissions is pre-computed in advance based on...
In this work, an Adaptive Channel Hopping (ACH) mechanism for sensor networks is proposed to avoid interference from other sources and narrow-band jamming. Under unfavorable channel conditions, ACH lets sensors switch to a new operating channel. ACH reduces the channel scanning and selection latency by ordering available channels using link quality indicator measurements and weights. The proposed...
The existence of channel variations (or fading) is one of the crucial challenges that affects the capacity of wireless networks. Recently, cooperative communications have emerged as a promising approach to achieve spatial diversity and thereby reduce the negative effects of fading on wireless channels. On the other hand, in addition to channel variations, it is well-known that interference among concurrent...
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