[PDF] Top 20 Contributo da utilização dos recursos educativos digitais no 1.º Ciclo do Ensino Básico

... years, cross-layer design for wireless communication systems has been paid more and more attention ...physical layer, along with the scheduling in the data link layer, it has been ... See full document

... wireless networks and advances in acoustic communications, multichannel technologies have been proposed to be used in underwater networks to increase data transmission rate over bandwidth-limited underwater ... See full document

... The performance of CSMA protocols are mainly a ff ected by the hidden node problem and the amount of data trans- mitted by nodes to the CHs. First of all, we want to point out that the random changing of the CHs can ... See full document

... Cross-layer design is a promising direction and challenging issue for quality delivery of multimedia over wireless ...a cross-layer design which can substantially enhance the ... See full document

... separating two data streams x v and x w from the other data streams and superposing ...the two nodes whose data streams will be superposed by the ...we design the transmit beamforming for ANCTB in ... See full document

... physical layer [4-10], such as the enhancement of the sens- ing ability for the SU and the improvement of the outage and error performances for both the PU and ...without relaying capability in the basic ... See full document

... Hoc Networks (MANETs) has received considerable attention, the issue of end- to-end latency has been largely ...a design concept for achieving an order-of-magnitude latency reduction in large-scale ... See full document

... by multiple channel parameters; thus, ...proposes two approaches to optimize network performance for this ...a cross-layer optimization method proposed to minimize the energy consumption of ... See full document

... the two-path relaying, an accu- rate channel estimation is ...cooperative relaying networks, many works focusing on the channel estimation can be found in ...training design and channel ... See full document

... hoc networks because of a higher degree of more constraints: nodes are indeed char- acterized by limited resources such as energy, storage, pro- cessing, and communication capabilities [1, ...protocols ... See full document

... to design robust precoders and decoders for source and relay nodes to minimize the ...for two-way relaying systems using already- known orthogonal sequence transmission ...precoder-decoder ... See full document

... sensor networks with concurrent support of multiple ...balanced two-slice problem in order to support two applications running in a WSN ...network layer protocol that forwards data ... See full document

... efficient way of communication in wired ...of cross-layer ...for cross layer design ÉCLAIR module in LLECLAIR provides the optimized merging of two or more layers whereas ... See full document

... relay networks than using the DF ...with multiple antennas than ED with single antenna and proposed sensing with different decision rules which OR rule has the better performance than AND ... See full document

... SDD relaying are analyzed by means of ...erent design concepts for the transceive filters in SDD ...SDD relaying. Further- more, SDD relaying, MRC-BF relaying, and MRC relaying ... See full document

... a cross layer energy efficient protocol which optimizes energy consumption of the sensor nodes at the Network, MAC and Physical layers of the protocol stack as most of energy consuming factors exist in ... See full document

... a cross layer design approach with the concept of cooper- ation among the nodes with best farthest neighbor scheme to increase the Quality of Service (QoS), reduce energy consumption, increases ... See full document

... The work in [13] proposed the concept of the expected transmission count (ETX) as the routing metric. ETX is calculated by measuring the delivery ratios for probe packets in bidirectional transmissions of each link. It ... See full document

... orthogonal multiple access (NOMA) relay in cognitive radio (CR) ...the antennas at the relay to disrupt eavesdropping, without affecting the primary ... See full document

... of multiple antennas impracti- cal in many wireless communications ...neighbouring multiple client apparatus to share their resources cooperatively with the transmitter in order to construct a ... See full document