The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Interference management (IM) is essential to wireless communication networks, but interference suppression, a key component of IM, is known to degrade users' achievable spectral efficiency (SE). It is thus important to select an appropriate IM method with optimal operating parameters according to diverse network deployments, transmit power differences of various communication equipments, and dynamically...
In the wireless world, the devices face a unique challenge of energy scarcity. Unlike the wired systems, there is no continuous wired energy resource available to power the ongoing wireless communication. Instead, the entire system runs on wireless batteries. Taking a step further in this field, the concept of energy harvesting is introduced a while ago. This paper combines the concept of harvesting...
In Wireless Sensor Networks, sensor nodes have limited resources such as processing power, memory and energy. Energy is an important factor to determine the lifetime of the network. Most part of the energy of a node is consumed in transmitting and receiving the data. Data transmission should be energy efficient to maximize the network's lifetime. Different architectures are used to transmit the data...
Aerial telecommunication platforms will be a part of the future communication networks. In this paper, we address the issue of optimizing the location of Aerial Base Stations (ABS) in Low Altitude Platforms (LAP) to minimize the power consumption. We propose a dynamic algorithm which attempts to maximize the received power at ABS by moving it between multiple points within its coverage area. Furthermore,...
We consider a cooperative communication system where source and destination exchange messages with the help of relays. We investigate a scenario where the relays are not equipped with fixed batteries but collect the required energy (for processing and transmission purposes) via simultaneous wireless information and power transfer (SWIPT). We assume the relays are randomly distributed in the scenario...
We propose and analyze the performance of full-duplex relay selection in primary/secondary spectrum-sharing networks. Contrary to half-duplex relaying, full-duplex relaying (FDR) enables simultaneous listening/forwarding at the secondary relay, thereby allowing for a higher spectral efficiency. However, since the source and relay simultaneously transmit in FDR, their superimposed signal at the primary...
We consider a confidential communication system in which a source sends a confidential information to the destination in the presence of an eavesdropper. Multiple relays are used to provide cooperative diversity to the destination. The destination and the eavesdropper are equipped with multiple antennas while each relay and source are equipped with single antenna. We are interested to protect the...
In this paper, to guarantee the reliable communications of the primary user (PU), we impose a joint constraints on both average and peak interference power. With multiple relays available, the performance for proactive decode-and-forward (DF) relaying is investigated in underlay cognitive relay networks. Particularly, considering the correlation among the received signal to noise ratios (SNRs), exact...
This paper addresses the resource allocation problem in collaborative relay-assisted OFDMA networks. Recent works on the subject have mainly considered symmetric source-to-relay and relay-to-destination resource allocations, which limits the achievable gains through relaying. In this paper our focus is two-fold. Firstly, we consider the problem of asymmetric radio resource allocation, where the objective...
A transmitter has access to X, a relay has access to Y, and a receiver has access to Z and wants to compute a given function ƒ(X, Y, Z). How many bits must be transmitted from the transmitter to the relay and from the relay to the receiver so that the latter can reliably recover ƒ(X, Y, Z)? The main result is an inner bound to the rate region of this problem which is tight when X - Y - Z forms a Markov...
In the context of efforts to achieve zero emissions of carbon dioxide, wake-up circuits have attracted attention as a promising approach for reducing standby power. The dominant consumers of standby power are household electric appliances driven by AC power such as TVs. In these appliances, power is lost at an AC-DC converter even when the appliances are turned off. Although an infrared remote controller...
This paper presents the outage performance in cognitive relay networks. The closed-form expression for the outage probability is derived in cognitive amplify-and-forward (AF) relay networks under the interference constraint. Through the Monte Carlo simulation, it is shown that our analytic result is a tight bound especially at high average signal to noise ratio (SNR). Additionally, the numerical result...
The capacity regions of line networks with node capacity constraints and broadcasting are derived when the broadcast channels are either deterministic or have erasures.
We design a cooperative retransmission scheme in the MAC layer which utilizes the UWB unique properties such as fine ranging and immunity to small scale fading in order to exploit the multiuser diversity in UWB networks. We analyze the optimal cooperation strategy to maximize the system throughput in proactive and reactive settings. We also perform simulations to show that the proposed UWB-based coperative...
We consider data-streaming from an access point to multiple receivers, which is modeled as packet erasure channel. A simple network coding is shown to achieve larger rate region than without network coding, using minimal control information. The performance is characterized exactly using state transition graph. The scheme is then mapped to an information theoretic formulation for broadcast channel...
In this paper, we propose a robust STBC transmission scheme to combat the timing synchronization errors over frequency-selective multiple-access channels. First, the equivalent channel model in the presence of timing synchronization errors is derived and we find that the synchronization errors result in an equivalent channel model with larger number of correlated channel taps. Based on this correlated...
This paper explores the attributes, layering models and objective functions in cross layer designs for mobile ad hoc wireless networks by taking all the statistical characteristics and constraints from the physical (PHY) layer, media access control (MAC) layer and network (NET) layer into consideration. This paper reviews the entire network optimization across all the PHY/MAC/NET layers. At the PHY...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.