Kiến trúc phần mềm Radio P12 pptx

... withlonger reach and greater reliability than analog radios. A first implementationof an SDR may not perform as well as the equiv alent analog radio because in-adequate attention is paid to the ... that general-purpose processorscannot be used for software radio research. For example, MIT has used theDEC Alpha chip for their virtual radio [178].DSP teams apply skill in the use of DSP chips ... spectrum is by manual channelselection. Many large groups of radio users including general aviation, citi-zens’ band (CB), and amateur radio operators employ this approach as theprimary mechanism...

Kiến trúc phần mềm Radio P6 pptx

... to be radio- aware so that the radio s low data rates, high variability indata transfer times, and occasional outages do not severely curtail user satis-faction with the services. In the radio ... approaches, the radio applications and infrastructure software elementsare intricately interwoven. Open-architecture approaches now favor the use ofthe industry-standard CORBA [216] in radio infrastructure ... This includes not just the processors, but the manycomputer-controlled features of the analog radio platform. Software designtradeoffs, then, include both top-down application of open-architecture...

Kiến trúc phần mềm Radio P8 pptx

... CallEXERCISES2872.Consider a wideband radio that implements frequency hopping with afast-hopping LO. What steps are necessary to migrate that implementationtoward a software -radio architecture? What benefits ... context. A SPEAKeasy-like radio may have to operate withina kilometer of a high-power (90 dBm) troposcatter communications system.Metal structures may reflect some of the radio energy with nonlinear ... in analyzing the effects ofRFI and EMI. RFI originates with high-power radio sources that are externalto the software radio and its host platform. EMI o riginates within the hosthardware or...

Kiến trúc phần mềm Radio P9 pptx

... algorithms and hardware can yield benefits (or cause problems)for the analog parts of the software radio. III. SDR APPLICATIONSADC and DAC applications are constrained by sampling rate and dynamicrange. ... A cellular uplink, for example, might consist of25 MHz from 824 to 849 MHz. The ideal software radio would convert directlyfrom RF at a sampling rate of say 2.3 GHz. The Nyquist frequency defines ... antenna through the informationstream delivered to the wireline network. Consequently, the software -radio systems engineer must allocate DNR to RF conversion, ADC, and digital fil-tering to maintain...

Kiến trúc phần mềm Radio P1 pot

... Interconnect), 316, 320Radar, 74, 75 Radio applications (layer), 377, 380–380 Radio horizon, 83 Radio infrastructure, 164, 211, 363–368, 378,380–381 Radio noise, 81, 397 Radio platform (reference model), ... Programmable Digital Radio (PDR) Case Studies 215A. A Basic Commercial PDR 215B. Multimode Conventional Radios 218C. GEC’s Programmable Digital Radio 220D. ITT Digital Radio 221E. Commercial ... for people withstrong software background but little background in radio engineering. Soft-ware radio is about wideband radio frequency (RF) hardware that is given its“personality” by software....

Kiến trúc phần mềm Radio P2 pps

...

Kiến trúc phần mềm Radio P3 pdf

... other. Each radio has LOS access to a point in the troposphere from which radio waves are scattered beyond LOS. Due to the weak coupling betweenthe radio waves and the troposphere, the radios employ ... programmabledigital radios. These radio suites also monitor emergency channels using ded-icated transceivers. This includes simultaneous VHF and UHF operation.Illustrative discrete radio products ... include general-purpose, single-channelground-based radios and multichannel radio relays. The AN/GRC-171(V)general-purpose ground-based radio, for example, delivers 20 W of RF powerfrom vehicular...

Kiến trúc phần mềm Radio P4 doc

... or moreradios each)500–3000 NationalGuard troops50–300 squad radios, 12–80 companyradios, 3–10 high-level command networkradios, radio relayswith 20–50 aircraft 20–50 air mobile radio nodes ... characterizes the expected parametersof that radio channel. All these are necessary in the analysis of software -radio architecture.A. Radio Resource Management Radio resources consist primarily of the ... the refinementsintroduced by software radio and radio- propagation prediction tools.1. A Simple Model of Radio Propagation and Spectrum ReuseIdeally, radio energy propagates in three dimensions...

Kiến trúc phần mềm Radio P5 docx

... inheritance re-lationships from the generic radio node class o f object. The domain (e.g.,handset, cell site, vehicular radio) property of the radio node is therefore in-herited by the function, ... interface. Layer 1 services are provided in the radio front end.The architecture accommodates multiple layer 1 services corresponding to the radio modes of the SDR. Thus, for example, a dual ... Receive$, which would correspond to the situation that the radio istransmitting and receiving both at once. This might be acceptable for someradios, but not for one controlled byC. Each subset...

Kiến trúc phần mềm Radio P7 potx

... disaster-relief case study?252ANTENNA SEGMENT TRADEOFFSbands. Using typical military radios such as SINCGARS, these radios willjam each other. Operational steps may reduce the number of networks ... 7-1.Due to the software radio s ability to concentrate energy, software constraintsmay be required to preclude unacceptable exposure levels. For example, afour-channel radio might be permitted ... effects have to be taken into account in the design of ahandheld radio product? Describe the potential impact of this aspect ofthe radio on the control software in an aggressive SDR application.5.What...

Xem thêm