Search results for "Modulation coding"

showing 2 items of 2 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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Presentations of constrained systems with unconstrained positions

2005

International audience; We give a polynomial-time construction of the set of sequences that satisfy a finite-memory constraint defined by a finite list of forbidden blocks, with a specified set of bit positions unconstrained. Such a construction can be used to build modulation/error-correction codes (ECC codes) like the ones defined by the Immink-Wijngaarden scheme in which certain bit positions are reserved for ECC parity. We give a lineartime construction of a finite-state presentation of a constrained system defined by a periodic list of forbidden blocks. These systems, called periodic-finite-type systems, were introduced by Moision and Siegel. Finally, we present a linear-time algorithm for con…

[INFO.INFO-DS]Computer Science [cs]/Data Structures and Algorithms [cs.DS]finite-memory systemperiodic-finite-type (PFT) system[INFO.INFO-DS] Computer Science [cs]/Data Structures and Algorithms [cs.DS]0102 computer and information sciences02 engineering and technologyLibrary and Information Sciences01 natural sciencesModulation coding0202 electrical engineering electronic engineering information engineeringMathematicsDiscrete mathematicsChannel codefinite-state encodermodulation codeDAWG020206 networking & telecommunicationsDirected graphDirected acyclic graphforbidden blockComputer Science ApplicationsFinite sequence010201 computation theory & mathematicscodeError detection and correctionrun-length limited (RLL) codesInformation SystemsCoding (social sciences)maximum transition run (MTR)
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