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Wireless network operation intrinsically assumes different forms of cooperation among the network nodes, such as sharing a common wireless medium without interfering, relaying frames belonging to other nodes, controlling the transmission power for optimizing spectrum reuse, coding cooperatively multiple frames for improving information redundancy, and so on. For this reason, Game Theory has been extensively...
There has been a lot of recent interest in the potential of inter-base station cooperation techniques to manage excessive out-of-cell interference in evolving cellular networks. In this paper, we propose and describe a signal processing approach based on a novel Network Interference Cancellation Engine (NICE), which opportunistically cancels dominant out-of-cell interference by exchanging decoded...
This paper proposes two optimal power allocation (OPA) schemes for two-hop wireless relay networks operating in amplify-and-forward (AAF) manner. All the relay nodes in the network participate in relaying information from the source to the destination. We explore the OPA schemes among the cooperative relays to maximize the received SNR at the destination. When the instantaneous channel state information...
Wireless networks are characterized by having limited resources accessed by a large number of mobile stations with distinct capabilities. In such challenged environment the dynamic control of resources is of major importance to mitigate the limitations of wireless networks, such as the impact of low data rate stations and wireless channel oscillations. Such augmented usage of wireless resources can...
Cooperative communication is an efficient method to combat wireless channel fading and to increase system throughput in future board communication. Through physical layer networking coding(PNC)modulation, two-way relaying has been shown to improve the network capacity significantly. However for power-constraints application, the performance of two-way relaying is actually inferior to one-way relaying...
Wireless multihop networking has been typically considered for industrial, military, or sensing applications [1][2]. Nevertheless, it has not been explicitly considered thus far for large-scale commercial access networks. This is mainly due to the fact that existing multihop networking technologies do not readily scale up in terms of number of terminals. Instead, an alternative packet relaying scheme...
In wireless systems (networks) planning, the typical goal is to maximize two parameters: coverage and capacity. Metrics describing each of these parameters are system-level channel characteristics: BER or data rate spatial distributions, etc. However, in practice, metrics based on physical radio channel characteristics are commonly employed instead (spatial distributions of signal level, SINR, delay...
In the general wireless network, the network terminal often cannot dynamically select the best path to access the network due to the absence of the detailed network parameters, which may cause the performance reduction of the network. In this paper we propose a new dynamic access link selection scheme (DALSS) based on the real time network state. The estimation of capacity and available bandwidth...
IEEE 802.22 is the first wireless standard based on cognitive radio (CR) technology. It defines the air interface for a wireless regional area network (WRAN) that uses fallow segments of the TV broadcast bands. CR technology enables unlicensed users in WRANs to utilize licensed (incumbent) spectrum bands on a non-interference basis to incumbent users. The coexistence between incumbent users and unlicensed...
The motivation for our work was a feasibility study of the use of wireless technologies, more concretely IEEE 802.11, in industrial control systems. The considered application for configuration files upload to a system component puts requirements on the throughput of the established connection. To estimate the TCP throughput under the large range of varying conditions an analytical model has been...
We present muNet, a wireless mesh network design and implementation to harness the multiuser capacity of wireless channels. Traditionally, media access control is designed to schedule one transmission between one sender and one receiver without interference at any given time. However, this design is suboptimal in terms of achieving the multiuser capacity of multi-access wireless channels. In muNet,...
We characterize the stability region of wireless, single-hop networks with time-varying imperfect channels. We define a joint scheduling and transmission rate control policy that maximizes the set of stable rates the network can support. Since obtaining the optimal policy is computationally complex, we confine our attention on the specific case of pure time division multiple access (TDMA) based scheduling...
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, available network information is mostly imprecise and incomplete. In this paper, we study the relationship between the information obtained by each node and the capacity of the wireless network. We also consider the communication overhead...
Traditional link-layer automatic repeat request (ARQ) protocols attempt to retransmit the corrupted frames regardless of the channel state. Since this channel-state unaware behavior may cause unnecessary retransmissions, traditional ARQ protocols may not be energy efficient Some channel- adaptive ARQ ideas have been proposed, such as, channel probing based ARQ and stochastic learning automaton based...
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