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In this paper we present the results of real-life localization experiments performed in an unprecedented cooperative and heterogeneous wireless context. These measurements are based on ZigBee and orthogonal frequency division multiplexing (OFDM) devices, respectively endowed with received signal strength indicator (RSSI) and round trip delay (RTD) estimation capabilities. More particularly we emulate...
The performance of cooperative diversity with opportunistic beamforming is analyzed in Rayleigh fading channels. Cooperative communication is viewed as a method for increasing diversity gain and reducing end to end path loss. The use of relays can create a virtual antenna array so that it allows users to exploit the advantages of multiple input multiple output (MIMO) techniques. In this paper we show...
This paper proposes a new position-based Routing protocol for Mobile Ad hoc networks, referred to as FORTEL. According to FORTEL, each node in the network maintains a location table that stores the location of all the other nodes. To discover a route to the destination, the source node relies on the location table to construct the destination's connectivity tree, which includes all the destination's...
The IEEE 802.11 standard conformant wireless communication stations have multi-rate transmission capability. To achieve greater communication efficiency, multi-rate capable stations use rate-adaptation to select appropriate transmission rate according to variations in the channel quality. This paper proposes a novel rate-adaptation scheme where the decision of rate selection relies on the mutual feedback...
Greedy and Contention-based forwarding schemes perform data routing hop-by-hop, without discovering the end-to-end route to the destination. Accordingly, the neighboring node that satisfies specific criteria is selected as the next forwarder of the packet. Both schemes require the nodes participating in the selection process to be within the area that confronts the location of the destination. Therefore,...
An adaptive joint source channel coding (JSCC) for image transmission over an additive white Gaussian noise (AWGN) channel is studied in a particular context, that to use the bandwidth effectively, which leads to a robust communication. Such that, the source symbol and the channel symbol possibly have different dimensions, the basic idea is to map efficiently the source space symbols into channel...
In this paper the probability density function of the duty cycle of a residential cooling unit is derived. The indoor temperature is modeled via a stochastic differential equation driven by a white Gaussian process. The state of the model is a hybrid state. The continuous part represents the indoor temperature and the discrete part of the model state represents the state of the thermostat switch (ON...
In this paper the probability density function of the duty cycle of a residential cooling unit is derived. The indoor temperature is modeled via a stochastic differential equation driven by a white Gaussian process. The state of the model is a hybrid state. The continuous part represents the indoor temperature and the discrete part of the model state represents the state of the thermostat switch (ON...
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