2022 无线通信原理（双语）(南京邮电大学) 最新满分章节测试答案

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本课程起止时间为:2022-03-02到2022-05-03
本篇答案更新状态:已完结

Chapter 1 Introduction to Wireless Communications Introduction to Wireless Communications

1、 问题:If a carrier frequency f = 60 GHz is adopted for a wireless communication, the wavelength λ of the carrier wave is ___ .
选项：
A:5 mm
B:10 mm
C:20 mm
D:50 mm
答案: 【5 mm】

2、 问题:The Bluetooth systems belong to the wireless network of ___ .
选项：
A:WMAN
B:WLAN
C:WPAN
D:WWAN
答案: 【WPAN】

3、 问题:In 2000, ITU approved three standards of WCDMA, CDMA2000 and ___ .
选项：
A:TD-CDMA
B:IS-95
C:GSM
D:TD-SCDMA
答案: 【TD-SCDMA】

4、 问题:For a wireless communication system, if the input power is 8 dBm, and the output power is 5 dBm, the system attenuation is ___ .
选项：
A:3 dBm
B:3 dB
C:13 dBm
D:13 dB
答案: 【3 dB】

5、 问题:Most cell phones operate in the frequency range of 800 to 2,200 KHz.
选项：
A:正确
B:错误
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
答案: 【错误】

7、 问题:Frequency division duplexing system uses different time slots for the forward and reverse channels.
选项：
A:正确
B:错误
答案: 【错误】

8、 问题:The Shannon capacity determines the theoretical limit on channel capacity for a given bandwidth and signal-to-noise ratio.
选项：
A:正确
B:错误
答案: 【正确】

【作业】Chapter 1 Introduction to Wireless Communications Introduction to Wireless Communications

1、 问题:What types can the wireless communication networks be divided into ? Please take at least one application for each type of them.
评分规则: 【 主要考察概念的具体描述
】

2、 问题:What are the differences among the simplexing, half-duplexing and full-duplexing ?
评分规则: 【 主要考察概念的具体描述
】

3、 问题:Please describe the TDD and FDD, and the differences between them.
评分规则: 【 主要考察概念的具体描述
】

4、 问题:100 W = ? dBW= ? dBm
评分规则: 【 主要考察单位的理解和转换计算
】

Chapter 2 The Cellular Concept ： System Design Fundamentals The Cellular Concept ： System Design Fu

1、 问题:In the cellular networks, the coverage area of each base station is named as cell.
选项：
A:正确
B:错误
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
答案: 【正确】

3、 问题:In a dynamic channel assignment strategy, each cell is allocated a predetermined set of channels.
选项：
A:正确
B:错误
答案: 【错误】

4、 问题:For a proper handoff situation, the handover threshold should be set slightly weaker than Minimum usable signal level
选项：
A:正确
B:错误
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
答案: 【错误】

6、 问题:A small value of the co-channel reuse ratio provides larger capacity.
选项：
A:正确
B:错误
答案: 【正确】

7、 问题:Cellular radio systems rely on trunking to accommodate a large number of users in a limited radio spectrum.
选项：
A:正确
B:错误
答案: 【正确】

8、 问题:A radio channel that is occupied for 20 minutes during an hour carriers 20 Erlangs of traffic.
选项：
A:正确
B:错误
答案: 【错误】

9、 问题:Cell splitting is used in high density subscriber areas to decrease system capacity.
选项：
A:正确
B:错误
答案: 【错误】

10、 问题:Sectoring has the capability of decreasing the co-channel interference and thus increasing system performance.
选项：
A:正确
B:错误
答案: 【正确】

【作业】Chapter 2 The Cellular Concept ： System Design Fundamentals The Cellular Concept ： System Desig

1、 问题:If 20MHz of total spectrum is allocated for a duplex wireless cellular system and each simplex channel has 25kHz RF bandwidth, find(a) the number of duplex channels.(b) the total number of channels per cell site, if N=4 cell reuse is used.
评分规则: 【 每问3分，主要考察公式的使用。
】

2、 问题:For a N=7 system with a Pr[Blocking]=1% average call length for two minutes, find the traffic capacity loss due to trunking for 57 channels when going from omnidirectional antennas to 60 degree sectored antennas. (Assume that blocked calls are cleared and the average per user call rate is λ=1 per hour.)
评分规则: 【 主要考察公式使用
】

3、 问题:A certain area is covered by a cellular radio system with 84 cells and a cluster size N. 300 voice channels are available for the system. Users are uniformly distributed over the area covered by the cellular system, and the offered traffic per user is 0.04 Erlang. Assume that blocked calls are cleared and the designated blocking probability is Pb=1%(a) Determine the maximum carried traffic per cell if cluster size N=4 is used.(b) Determine the maximum number of users that can be served by the system for a blocking probability of 1% and cluster size N=4.
评分规则: 【 每问4分，其中每种情况占10分。
】

Chapter 3 Mobile Radio Propagation ： Large-Scale Path Loss Mobile Radio Propagation ： Large-Scale P

1、 问题:The effective radiated power denotes the maximum radiated power as compared to the ___ .
选项：
A:isotropic antenna
B:monopole antenna
C:half-wave dipole antenna
D:parabolic antenna
答案: 【half-wave dipole antenna】

2、 问题:The growth rate of the path loss in free space is ___ .
选项：
A:1 dB/decade
B:10 dB/decade
C:20 dB/decade
D:100 dB/decade
答案: 【20 dB/decade】

3、 问题:___ occurs when a propagating wave impinges upon an object which has very large dimensions when compared to the wavelength of the wave.
选项：
A:Reflection
B:Diffraction
C:Scattering
D:Reflection or diffraction
答案: 【Reflection】

4、 问题:The Q-function is determined by the factors except the ___ of the received signal.
选项：
A:threshold level
B:average power
C:coverage area
D:standard deviation
答案: 【coverage area】