MOOC 无线通信原理(双语)-南京邮电大学 中国大学慕课答案.docx
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1、 MOOC 无线通信原理(双语)-南京邮电大学 中国大学慕课答案Introduction to Wireless CommunicationsIntroduction to Wireless Communications1、问题:If a carrier frequency f = 60 GHz is adopted for a wireless communication, thewavelength of the carrier wave is _ .选项:A、5 mmB、10 mmC、20 mmD、50 mm正确答案:【5 mm】2、问题:The Bluetooth systems be
2、long to the wireless network of _ .选项:A、WMANB、WLANC、WPAND、WWAN正确答案:【WPAN】3、问题:In 2000, ITU approved three standards of WCDMA, CDMA2000 and _ .选项:A、TD-CDMAB、IS-95C、GSMD、TD-SCDMA正确答案:【TD-SCDMA】4、问题:For a wireless communication system, if the input power is 8 dBm, and theoutput power is 5 dBm, the syst
3、em attenuation is _ .选项:A、3 dBmB、3 dBC、13 dBmD、13 dB正确答案:【3 dB】 5、问题:Most cell phones operate in the frequency range of800 to 2,200 KHz.选项:A、正确B、错误正确答案:【错误】6、问题:WIFI is a wireless local network that runs of the IEEE 802.15 standards set.选项:A、正确B、错误正确答案:【错误】7、问题:Frequency division duplexing system us
4、es different time slots for the forwardand reverse channels.选项:A、正确B、错误正确答案:【错误】8、问题:The Shannon capacity determines the theoretical limit on channel capacity fora given bandwidth and signal-to-noise ratio.选项:A、正确B、错误正确答案:【正确】The Cellular Concept : System Design FundamentalsThe Cellular Concept : Sy
5、stem Design Fundamentals1、问题:In the cellular networks, the coverage area of each base station is named ascell.选项:A、正确B、错误正确答案:【正确】2、问题:In the N-Cell reuse pattern, the frequency reuse factor is 1/N.选项:A、正确B、错误正确答案:【正确】 3、问题:In adynamicchannel assignment strategy, each cell is allocated apredetermine
6、d set of channels.选项:A、正确B、错误正确答案:【错误】4、问题:For a proper handoff situation, the handover threshold should be set slightlyweakerthan Minimum usable signal level选项:A、正确B、错误正确答案:【错误】5、问题:In an N-cell reuse pattern, N can choose any positive number.选项:A、正确B、错误正确答案:【错误】6、问题:A small value of the co-channel
7、 reuse ratio provides largercapacity.选项:A、正确B、错误正确答案:【正确】7、问题:Cellular radio systems rely on trunkingto accommodate a large number ofusers in a limited radio spectrum.选项:A、正确B、错误正确答案:【正确】8、问题:A radio channel that is occupied for 20 minutes during an hour carriers 20Erlangs of traffic.选项:A、正确B、错误正确答案
8、:【错误】9、问题:Cell splitting is used in high density subscriber areas to decreasesystemcapacity.选项: A、正确B、错误正确答案:【错误】10、问题:Sectoringhas the capability of decreasing the co-channel interference andthus increasing system performance.选项:A、正确B、错误正确答案:【正确】Mobile Radio Propagation : Large-Scale Path LossMobil
9、e Radio Propagation : Large-Scale Path Loss1、问题:The effective radiated power denotes the maximum radiated power ascompared to the _ .选项:A、isotropic antennaB、monopole antennaC、half-wave dipole antennaD、parabolic antenna正确答案:【half-wave dipole antenna】2、问题:The growth rate of the path loss in free space
10、 is _ .选项:A、1 dB/decadeB、10 dB/decadeC、20 dB/decadeD、100 dB/decade正确答案:【20 dB/decade】3、问题:_ occurs when a propagating wave impinges upon an object which has verylarge dimensions when compared to the wavelength of the wave.选项:A、ReflectionB、DiffractionC、ScatteringD、Reflection or diffraction正确答案:【Refle
11、ction】4、问题:The Q-function is determined by the factors except the _ of the receivedsignal. 选项:A、threshold levelB、average powerC、coverage areaD、standard deviation正确答案:【coverage area】5、问题:In free space, the received power is proportional to the carrier wavelength.选项:A、正确B、错误正确答案:【正确】6、问题:The path loss
12、 represents signal gain as a positive difference between theeffective transmitted power and the received power.选项:A、正确B、错误正确答案:【错误】7、问题:When the medium consists of a large number of objects with dimensions thatare small compared to the wavelength, scattering wave can be observed.选项:A、正确B、错误正确答案:【正确】
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