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】
13、8、问题：The close-in reference distance, the path loss exponent and the standarddeviation statistically describe the path loss model considering random shadowingeffects.选项：A、正确B、错误正确答案:【正确】Small-Scale Fading and Multipath, and Introduction of MIMOTechnologiesSmall-Scale Fading and Multipath, and Introd
14、uction of MIMOTechnologies1、问题：Fading can be classified into small scalefading and large scale fading.选项： A、正确B、错误正确答案:【正确】2、问题：Small-scale fades are characterized by deep and slow amplitude fluctuationswhich occur as the mobile moves over distances of just a few wavelengths.选项：A、正确B、错误正确答案:【错误】3、问题
15、：What is frequency flat fading? A type of small scale fading where frequencysignal components experience different magnitudes of fading.选项：A、正确B、错误正确答案:【错误】4、问题：If the attenuation and path delay of a complex channel response vary withfrequency, the channel is called a time-variant complex channel.选项
16、：A、正确B、错误正确答案:【错误】5、问题：For simulating a frequency selective channel, discrete-time TDL filters ismandatory to haveN = 1 while N is the number taps of the filter.选项：A、正确B、错误正确答案:【错误】6、问题：There are many diversity methods to realize Independent fading paths, such asSpace Diversity, Polarization Diversi
17、ty, Frequency diversity and timediversity.选项：A、正确B、错误正确答案:【正确】7、问题：Small Scale Fading is divided into two main, i.e., multipath delay spread andfrequency spread.选项：A、正确 B、错误正确答案:【错误】8、问题：MIMO stands forMultiple Input, Multiple Output, and is a form of radioantenna that increases efficiency by increa
18、sing the number of transmitters and receivers.选项：A、正确B、错误正确答案:【正确】9、问题：MIMO capacity is independent on propagation channel.选项：A、正确B、错误正确答案:【错误】10、问题：For a bad MIMO channels, spatial correlation is high and the capacity is low.选项：A、正确B、错误正确答案:【正确】Multiple Access Techniques for Wireless Communications
19、Multiple Access Techniques for Wireless Communications1、问题：CDMA uses the power control to combat the .选项：A、self-jammingB、near-far problemC、multi-user interferenceD、noise interference正确答案:【near-far problem】2、问题：Which system needs the equalization?选项：A、OFDMAB、FDMAC、CDMAD、TDMA正确答案:【TDMA】 3、问题：Which is
20、the feature of slotted Aloha?选项：A、Time is divided into equal time slots.B、Transmit only at the beginning of a time slot.C、Avoid partial collisions.D、Increase delay, and require synchronization.正确答案:【Time is divided into equal time slots.#Transmit only at the beginning of atime slot.#Avoid partial co
21、llisions.#Increase delay, and require synchronization.】4、问题：Which are features of the CDMA system?选项：A、Soft handoffB、near-far problemC、self-jamming and soft capacity limitD、RAKE receiver正确答案:【Soft handoff#near-far problem#self-jamming and soft capacity limit#RAKEreceiver】5、问题：_ and _ can improve the
22、 capacity of CDMA system.选项：A、Antenna SectorizationB、Cell splittingC、Voice activityD、Coverage zoom正确答案:【Antenna Sectorization#Voice activity】6、问题：There areTDMA/TDD and TDMA/FDD.选项：A、正确B、错误正确答案:【正确】7、问题：CDMA is superior to TDMA and FDMA.选项：A、正确B、错误正确答案:【错误】8、问题：Spread spectrum lowers the signal lever
23、 and reducesthe bandwidth of channel.选项：A、正确 B、错误正确答案:【错误】9、问题：The vulnerable period in pure Aloha is two packets, and the vulnerable periodin slotted Aloha is a packet.选项：A、正确B、错误正确答案:【正确】10、问题：The capacity of FDMA and TDMA system is interferencelimited, while thecapacity of CDMA system is bandwidt
24、h limited.选项：A、正确B、错误正确答案:【错误】Introduction of New Cellular Communication TechnologyIntroduction of New Cellular Communication Technology1、问题：OFDMA is the hybird of FDMA and .选项：A、CDMAB、TDMAC、FHMAD、CSMA正确答案:【TDMA】2、问题：In the OFDMA, each sub-band has _ sub-carriers.选项：A、12B、10C、8D、14正确答案:【12】3、问题：5G d
25、enotes the proposed next major phase of mobile telecommunicationstandards beyond the current LTE-Advanced standards. The end-to-end latencyrequirement in 5G system is .选项：A、0.01 msB、0.1 ms C、1 msD、10 ms正确答案:【1 ms】4、问题：mMTC of 5G denotes massive machinetype communications.选项：A、正确B、错误正确答案:【正确】5、问题：5G Bands have been broadly divided into two categories: sub-6 GHz (FR1)and visible light(FR2).选项：A、正确B、错误正确答案:【错误】
