Search results for " Signal design"

showing 3 items of 3 documents

Out-of-Band Signaling Scheme for High Speed Wireless LANs

2007

In recent years, the physical layer data rate provided by 802.11 Wireless LANs has dramatically increased thanks to significant advances in the modulation and coding techniques employed. However, previous studies show that the 802.11 MAC operation, namely the distributed coordination function (DCF), represents a limiting factor: the throughput efficiency drops as the channel bit rate increases, and a throughput upper limit does indeed exist when the channel bit rate goes to infinite high. These findings indicate that the performance of the DCF protocol will not be efficiently improved by merely increasing the channel bit rate. This paper shows that the DCF performance may significantly bene…

Computer scienceComputer network performanceWireless LANThroughputDistributed coordination functionBackward compatibilityIEEE 802.11Packet switchingWireless lanWireless LAN Throughput Bit rate Physical layer Modulation coding Access protocols Content management Signal design Media Access Protocol Performance analysisElectrical and Electronic EngineeringIEEE 802.11Settore ING-INF/03 - Telecomunicazionibusiness.industryApplied MathematicsComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSPhysical layerCode rateComputer Science ApplicationsComputer network performance; IEEE 802.11; Wireless LANBurst switchingModulationOut-of-band managementbusinessCommunication channelComputer networkIEEE Transactions on Wireless Communications
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On the optimal design of multi-stage cascaded transistor amplifiers with noise, gain and mismatch constraints

2007

The problem of evaluating the optimal performances of cascaded, unbalanced, multi-stage transistor amplifiers is addressed. In particular, a theoretically rigorous approach is proposed for the determination of a family of Optimal Design Curves (ODC's) which express the best noise-gain tradeoff that can be achieved - at each frequency and device operating condition - when a simultaneous constraint on amplifier input VSWR is accounted for. Such curves can be used as a more meaningful starting point in practical amplifier design in place of the approximate calculations so far employed for target performance or optimization goals determination.

Optimal designEngineeringDesign optimization Performance evaluation Frequency Low-noise amplifiers Signal design Performance gain Telecommunications Constraint theory Electronic design automation and methodology Minimizationbusiness.industryAmplifierTransistorTransistor arraySettore ING-INF/01 - ElettronicaNoise (electronics)law.inventionConstraint (information theory)lawControl theoryElectronic engineeringPoint (geometry)Standing wave ratiobusiness2007 18th European Conference on Circuit Theory and Design
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A digital device for the diagnosis of insulation systems

2004

A complete innovative measurement system (D2SI - device for the diagnosis of insulation systems) for both acquisition, analysis and processing of partial discharge signals generated in insulation systems under voltage stress (IEC standard), was designed and realized; several measurements on practical insulation systems demonstrated the full and correct equipment operation.

Stress (mechanics)EngineeringDigital devicebusiness.industrySystem of measurementPartial dischargeElectrical engineeringDielectrics and electrical insulation Partial discharge measurement Stress measurement Signal analysis Partial discharges Signal processing Signal generators Voltage IEC standards Signal designIec standardsbusinessVoltageThe 17th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2004. LEOS 2004.
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