第一章 单元测试

1、 问题:The mobile telephone network in New York could only support small number of subscribers mainly because the power of the base station is too low. （ ）
选项：
A:对
B:错
答案: 【
错
】

2、 问题:The first generation WLAN devices had to use low power density scheme because high power devices are very expensive. （ ）
选项：
A:对
B:错
答案: 【
错
】

3、 问题:__ is not the reason that why the 1st generation WLAN is not widely used. （ ）
选项：
A:Lack of mobility.
B:Low data rate.
C:Short coverage.
D:Lack of standardization.
答案: 【
Lack of mobility.
】

4、 问题: and are two main disadvantages for high altitude orbits satellite communications. （ ）
选项：
A:High path loss
B:small coverage.
C:big propagation delay
D:multipath interference.
答案: 【
High path loss
big propagation delay
】

5、 问题:The first wireless communication networks in the Pre-industrial age transmitted information by using some simple signals, such like signals, signal, signal ___, or beating drums. （ ）
选项：
A:smoke
B:fire
C:flares
D:laser
答案: 【
smoke
fire
flares
】

第二章 单元测试

1、 问题:What can cause power variation in the received signal over the distance? （ ）
选项：
A:free-space propagation
B:constant signal source power
C:path loss
D:shadowing effects
答案: 【
path loss
shadowing effects
】

2、 问题:

Which frequency band is used for television communications and radio navigation systems? （ ）

选项：
A:3 kHz -30 kHz
B:3 MHz -30 MHz
C:30 MHz -300 MHz
D:300 MHz -3 GHz
答案: 【
30 MHz -300 MHz
】

3、 问题:Path loss and Shadowing are generally referred as large scale propagation effects. （ ）
选项：
A:对
B:错
答案: 【
对
】

4、 问题:Fresnel knife edge diffraction model is commonly used diffraction model. （ ）
选项：
A:对
B:错
答案: 【
对
】

5、 问题:Shadowing is caused by the amplification of the power radiated by the transmitter and the reflective effects of the propagation channel. （ ）
选项：
A:对
B:错
答案: 【
错
】

第三章 单元测试

1、 问题:There are many physical factors in the radio propagation environment influence small-scale fading，such as ____. （ ）
选项：
A:Multipath propagation
B:The signal bandwidth
C:Relative motion of the receiver and transmitter
D:Relative motion of the receiver and surrounding objects
答案: 【
Multipath propagation
The signal bandwidth
Relative motion of the receiver and transmitter
Relative motion of the receiver and surrounding objects
】

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