商品簡介
Over the last three decades, interest in Infrared (IR) technology as a medium to convey information has grown considerably. This is reflected by the increasing number of devices such as laptops, PDAs, and mobile phones that incorporate optical wireless transceivers and also by the increasing number of optical wireless links available for indoor and outdoor use. The popularity of IR is based on the advantages it has over radio including unregulated bandwidth, immunity to radio interference, and inherent security. Optical Wireless Communications examines some of the most important features of optical wireless communication systems. It considers the benefits and limitations of IR as a medium conveying information wirelessly and compares the advantages and disadvantages of infrared to microwave and other radio systems. It also details the evolution of IR communication systems and describes atmospheric and other types of data transmission limitations. The book presents design fundamentals of optical concentrators, as well as a review of some of the most important receiver optical front-ends (containing imaging or non-imaging concentrators and optical filters), including an explanation of the different sources of infrared noise and an introduction to eye safety. It also describes optical wireless transmitter and receiver design issues, typical modulation, coding, and multiple access techniques, and introduces IrDA protocols and wireless IR networking.
目次
INTRODUCTIONTechnology OverviewSystem ConfigurationsEvolution of Infrared Communication SystemsThe Optical Wireless ChannelDesign FundamentalsPower Budget ConsiderationsSummary and ConclusionsATMOSPHERIC TRANSMISSION LIMITATIONSIntroduction to Atmospheric PropagationImportant DefinitionsAtmospheric TransmissionEffect of Rain, Fog, and MistScintillationSummary and ConclusionsDATA TRANSMISSION LIMITATIONS AND EYE SAFETYData Transmission LimitationsEye SafetyExtended vs. Collimated SourcesHolographic DiffusersLEDs vs. LDsSpecial Considerations for Outdoor SystemsSummary and ConclusionsFUNDAMENTALS OF OPTICAL CONCENTRATIONOverview of Optical ConcentrationGeometrical Optics and Ray TracingOptical Path Length and Fermat's PrincipleThe Etendue or Lagrange InvariantThe Edge Ray PrincipleConcentration RatioSummary and ConclusionsOPTICAL CONCENTRATORSOverview of Optical ConcentratorsWireless IR Receiver RequirementsOptical FiltersOptical ConcentratorsDTIRC CharacteristicsComparison of ConcentratorsPractical IssuesOther Shapes of DTIRCsSummary and ConclusionsOPTICAL WIRELESS TRANSMITTER DESIGNIntroduction to Optical Wireless Transmitter DesignTransmitter Design ConsiderationsOptical Source CharacteristicsTypes of Optical ModulationDriver Circuit Design ConceptsCurrent Steering Output CircuitBack Termination CircuitPredriverData RetimingAutomatic Power ControlTransmitters Linearization TechniquesOPTICAL WIRELESS RECEIVER DESIGNReceiver Design ConsiderationsPhotodetection in Reverse-biased DiodesChoosing the PhotodetectorReceiver Noise ConsiderationBit Error Rate and SensitivityBandwidthSignal Amplification TechniquesReceiver Main Amplifier (RMA)Transceiver Circuit Implementation Technologies: Hybrid and Monolithic IntegrationSummary and ConclusionsMODULATION, CODING, AND MULTIPLE ACCESSIntroduction to Modulation and Multiple Access TechniquesModulationModulation Techniques ComparisonModulation Schemes in The Presence of NoiseModulation Schemes in the Presence of Multipath DistortionMultiple Access TechniquesSummary and ConclusionsIrDA PROTOCOLSWireless Protocol StandardsThe Infrared Data AssociationIrDA Standard OverviewThe Physical Layer ProtocolFramer/DriverIrLAPIrLMPInformation Access Service and ProtocolTiny Transport ProtocolSession and Application Layer ProtocolsSummary and ConclusionsWIRELESS IR NETWORKINGIntroduction to Wireless IR NetworkingNetwork ArchitectureOptical Wireless Network SpecificationsThe Ad Hoc NetworkQuality of Service (QoS)Future Infrared NetworkingREFERENCES
