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【百年教育职业培训中心】通信原理-章节资料考试资料-东南大学 (2)

来源：百年教育职业培训中心　更新时间：2022-06-04 06:06:58

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第零章单元测验

1、【单选题】<img src="http://edu-image.nosdn.127.net/E43E5BF6C949F92D8456ABD8FF9FF356.png?imageView" />

A、a continuous rectangular pulses

B、a periodic sequence of rectangular pulses

C、a continuous sinusoidal signal

D、a periodic sinusoidal signal

2、【单选题】The reverse of modulation is .

A、encoding

B、demodulation

C、decoding

D、modulator

3、【单选题】A common problem with electromagnetic wave propagation via sky wave in thehigh fequency (HF) range is .

A、Wide transmission bandwidth

B、signal multipath

C、Linear time-varying channel

D、Broad-area coverage

4、【多选题】Two primary resources employed in communication systems are and .

A、 power

B、bandwidth

C、frequency

D、source of Information

5、【多选题】The three commonly used method of multiplexing are ， and .

A、FDM

B、TDM

C、CDM

D、FDMA

6、【多选题】<img src="http://edu-image.nosdn.127.net/38367D04E3BE0A7872377AF900A38841.png?imageView" />

A、transmitter

B、channel

C、receiver

D、source of imformation

7、【多选题】<img src="http://edu-image.nosdn.127.net/4732E4D7D09F85465AFEB8EAE76AA4F8.png?imageView" />

A、coaxial cable

B、telephone channel

C、universal Serial Bus

D、optical fiber

8、【多选题】<img src="http://edu-image.nosdn.127.net/1497AF2D06B458071948FF433D46BAA8.png?imageView" />

A、wireless broadcast channel

B、underwater acoustic channel

C、 satellite channel

D、 mobile radio channel

9、【判断题】<img src="http://edu-image.nosdn.127.net/00B3D4AED1C819A535C2FE676AA016C0.png?imageView&thumbnail=890x0&quality=100" />

A、正确

B、错误

10、【判断题】<img src="http://edu-image.nosdn.127.net/448DF4FD7A4798EF5DB49718F765857E.png?imageView&thumbnail=890x0&quality=100" />

A、正确

B、错误

11、【判断题】<img src="http://edu-image.nosdn.127.net/C9F14CA37030DC7EA5C062E25A40970E.png?imageView

A、正确

B、错误

12、【判断题】<img src="http://edu-image.nosdn.127.net/F85874931B0834A776D7954D68CA7CDD.png?imageView&thumbnail=890x0&quality=100" />

A、正确

B、错误

13、【判断题】<img src="http://edu-image.nosdn.127.net/37EE8F0FA63AFC9AE86C0183FFD19399.png?imageView

A、正确

B、错误

14、【判断题】<img src="http://edu-image.nosdn.127.net/4661F372AAC2E479BD6DB2423B92C845.png?imageView&thumbnail=890x0&quality=100" />

A、正确

B、错误

15、【判断题】<img src="http://edu-image.nosdn.127.net/BD39EA9A655FB0A0D966B7D525CD50A9.png?imageView

A、正确

B、错误

16、【判断题】<img src="http://edu-image.nosdn.127.net/95607B669976381DF432CF889F5EE48D.png?imageView&thumbnail=890x0&quality=100" />

A、正确

B、错误

17、【判断题】<img src="http://edu-image.nosdn.127.net/5DE9959186388BCDF9F60D40C95E8FF0.png?imageView&thumbnail=890x0&quality=100" />

A、正确

B、错误

18、【填空题】<img src="http://edu-image.nosdn.127.net/38367D04E3BE0A7872377AF900A38841.png?imageView&thumbnail=890x0&quality=100" />

A、

19、【填空题】<img src="http://edu-image.nosdn.127.net/DC31739862751AA01D862C654CDC2CF9.png?imageView&thumbnail=890x0&quality=100" />

A、

20、【填空题】<img src="http://edu-image.nosdn.127.net/ADAD4EAFCBC23C60D245710E88D1B7E2.png?imageView&thumbnail=890x0&quality=100" />

A、

21、【填空题】<img src="http://edu-image.nosdn.127.net/64BC3878FE55B175900EFC78E242D4C6.png?imageView

A、

22、【填空题】<img src="http://edu-image.nosdn.127.net/E43E5BF6C949F92D8456ABD8FF9FF356.png?imageView&thumbnail=890x0&quality=100" />

A、

23、【填空题】<img src="http://edu-image.nosdn.127.net/2B764DFB7AF958A60A27ECCCDCE346FC.png?imageView

A、

24、【填空题】<img src="http://edu-image.nosdn.127.net/E5C631767E8196624BA6BB06E0D4E81B.png?imageView&thumbnail=890x0&quality=100" />

A、

第一章单元测验-1

1、【单选题】This random process X (t) =cos(2πfct). the frequencies can be 100, 200, . . . , 600 Hz，then:

A、The possible values of X (0.001) could be cos(0.2π), cos(0.4π), . . . , cos(l .2π)，and each has a probability 1/6.

B、The possible values of X (0.001) could be cos(0.1π), cos(0.2π), . . . , cos(0.6π), and each has a probability 1/6.

C、The possible values of X (0.001) could be cos(0.2π), cos(0.4π), . . . , cos(l .2π)

D、The possible values of X (0.001) could be cos(0.1π), cos(0.2π), . . . , cos(0.6π)

2、【单选题】<img src="http://edu-image.nosdn.127.net/1689B23B5657D5D344202C2207B0189B.png?imageView&thumbnail=890x0&quality=100" />

A、<img src="http://edu-image.nosdn.127.net/014764C0254CACD336CA64B0F4429C50.png?imageView&thumbnail=890x0&quality=100" />

B、<img src="http://edu-image.nosdn.127.net/442FC74933F55461779007FCB8D11775.png?imageView&thumbnail=890x0&quality=100" />

C、<img src="http://edu-image.nosdn.127.net/AEBD28AA1099BB4B6382BC65BD4DC4E2.png?imageView&thumbnail=890x0&quality=100" />

D、<img src="http://edu-image.nosdn.127.net/1414CFF89DE63FFF685E38B3D68604AD.png?imageView&thumbnail=890x0&quality=100" />

3、【多选题】Which one of the following functions can be the autocorrelation function of a random process?

A、<img src="http://edu-image.nosdn.127.net/AC2FFE3975B29324D4E55FF34DD1A701.png?imageView&thumbnail=890x0&quality=100" />

B、<img src="http://edu-image.nosdn.127.net/4C4D5FC9086D0803192F2BA6505EFA18.png?imageView&thumbnail=890x0&quality=100" />

C、<img src="http://edu-image.nosdn.127.net/66CA5478405DB01BBE183F0D762D51A3.png?imageView&thumbnail=890x0&quality=100" />

D、<img src="http://edu-image.nosdn.127.net/FBFDDBA381ACD14DDFAF9E8675251FE4.png?imageView&thumbnail=890x0&quality=100" />

4、【判断题】<img src="http://edu-image.nosdn.127.net/958B4F42980D16EF18FCB675A4704B06.png?imageView height: 67px;" />

A、正确

B、错误

5、【判断题】<img src="http://edu-image.nosdn.127.net/098FB45E056DE6DD23B7951ACED981E4.png?imageView&thumbnail=890x0&quality=100" />

A、正确

B、错误

6、【判断题】<img src="http://edu-image.nosdn.127.net/B16392B0ACA1A78A96252F87C9699FA1.png?imageView height: 47px;" />

A、正确

B、错误

第一章作业

第一章测试

1、【多选题】Considering the properties of the autocorrelation function Rx(τ) of a random process X(t).

A、<img src="http://edu-image.nosdn.127.net/638FE935EC45FA451B827E6FE4E9A07B.png?imageView&thumbnail=890x0&quality=100" />

B、<img src="http://edu-image.nosdn.127.net/844D2DDC05A8AF3454A35219DCE2BB43.png?imageView&thumbnail=890x0&quality=100" />

C、<img src="http://edu-image.nosdn.127.net/F2F3587B35E688E5E680E9948F5B10C4.png?imageView&thumbnail=890x0&quality=100" />

D、<img src="http://edu-image.nosdn.127.net/94A8B6F622E17909DF3C51E6DFC8A738.png?imageView&thumbnail=890x0&quality=100" />

2、【多选题】Considering the properties of the sine wave plus narrowband noise.

A、If the narrowband noise is Gaussian, the in-phase and quadrature components are jointly Gaussian.

B、Both the in-phase and quadrature component have the same variance.

C、Both the in-phase and quadrature component have the same mean.

D、The envelope and phase components are statistically independent.

3、【多选题】<img src="http://edu-image.nosdn.127.net/9CABD2D409ADE7AA165B47925E6D5616.png?imageView&thumbnail=890x0&quality=100" />

A、The mean of Y is 0.

B、<img src="http://edu-image.nosdn.127.net/2FEE6CAF28BB50F45F1012D57336309E.png?imageView&thumbnail=890x0&quality=100" />

C、<img src="http://edu-image.nosdn.127.net/A8283A900E6731251575A4DF6A8C550D.png?imageView&thumbnail=890x0&quality=100" />

D、Y is also Gaussian

4、【多选题】<img src="http://edu-image.nosdn.127.net/90D2DD8B8B0EBCFA14AEBEF10B58D3D9.png?imageView

A、<img src="http://edu-image.nosdn.127.net/D88D63764D2B4162EF98932BFD7DFD61.png?imageView&thumbnail=890x0&quality=100" />

B、<img src="http://edu-image.nosdn.127.net/06EAC547A6916B7739F04C1D05558B9E.png?imageView&thumbnail=890x0&quality=100" />

C、The power in X(t) is 4W.

D、The power in X(t) is 8W.

5、【判断题】<img src="http://edu-image.nosdn.127.net/1E9512879727696670FB0E139993FEA7.png?imageView height: 53px;" />

A、正确

B、错误

6、【判断题】<img src="http://edu-image.nosdn.127.net/3470531F56CE9B674E5C48EA0E0A4133.png?imageView&thumbnail=890x0&quality=100" />

A、正确

B、错误

7、【判断题】<img src="http://edu-image.nosdn.127.net/D8CD637A37E635728985A1D9B1BFA328.png?imageView

A、正确

B、错误

8、【判断题】Thermal noise is a stationary, zero-mean Gaussian process.

A、正确

B、错误

9、【判断题】If two processes are statistically independent, they are orthogonal.

A、正确

B、错误

10、【判断题】For stationary processes, means, variances and covariance are independent of time.

A、正确

B、错误

第二章单元测试-1

1、【判断题】In Amplitude Modulation (AM), if the carrier wave is over-modulated, envelop detection cannot be used to recover the message signal.

A、正确

B、错误

2、【判断题】For the same modulating wave, the transmission bandwidth of double sideband-suppressed carrier (DSB-SC) modulation is the same as that of amplitude modulation (AM).

A、正确

B、错误

3、【判断题】The effect of a small, constant phase error between the incoming carrier and the local oscillator in the coherent demodulation of SSB is overmodulation.

A、正确

B、错误

4、【判断题】AM, DSB-SC, SSB, VSB can use coherent demodulation.

A、正确

B、错误

5、【填空题】If the highest frequency component of the message signal is at 10 kHz, then the lowest value of carrier frequency that keeps the Double Sideband-Suppressed Carrier (DSB-SC) modulation from sideband overlap is kHz

A、

6、【填空题】<img src="http://edu-image.nosdn.127.net/B80471937E9CD11BADBD50C45B4A71BB.png?imageView&thumbnail=890x0&quality=100" />

A、

7、【填空题】<img src="http://edu-image.nosdn.127.net/C88864D8315136318D11B2441935A386.png?imageView&thumbnail=890x0&quality=100" />

A、

第二章单元测试-2

1、【判断题】Both AM and NBFM have same transmission bandwidth, they are linear modulation schemes.

A、正确

B、错误

2、【判断题】 Angle modulation can provide better discrimination against noise and interference than AM modulation.

A、正确

B、错误

3、【填空题】Among these modulation schemes including AM，DSB，SSB and VSB , is easiest to demodulation.

A、

4、【填空题】12 different message signals, each with a bandwidth of 20 kHz, are to be multiplexed and transmitted. If the multiplexing and modulation methods are frequency-division multiplexing (FDM) and sideband-suppressed carrier (SSB-SC) modulation, respectively, then the minimum bandwidth required is kHz.

A、

5、【填空题】In a single tone Frequency Modulation (FM), the modulating wave is m(t) = Amcos(2pfmt) = 4cos(200pt) V, the frequency sensitivity of the modulator kf = 0.5, then the frequency deviation of FM is Hz.

A、

6、【填空题】A single tone frequency modulation (FM) signal with carrier frequency fc = 1 MHz is described by the equation s(t)=50cos(2πfct+5sin(2000πt)). Then the modulation index β is ____.

A、

第二章作业

第二章章节测试

1、【判断题】 FM can improve noise performance via increasing transmission bandwidth.

A、正确

B、错误

2、【判断题】Coherent detection of Double Sideband-Suppressed Carrier (DSB-SC) signal and envelope detection of Frequency Modulation (FM) signal both have the threshold effect.

A、正确

B、错误

3、【判断题】AM can improve noise performance via increasing transmission bandwidth.

A、正确

B、错误

4、【判断题】10 different message signals, each with a bandwidth of 20 kHz, are to be multiplexed and transmitted. If the multiplexing and modulation methods are frequency-division multiplexing (FDM) and double sideband-suppressed carrier (DSB-SC) modulation, respectively, then the minimum bandwidth required is 200 kHz.

A、正确

B、错误

5、【判断题】The envelop of a PM or wideband FM signal is constant,whereas the envelop of an AM or narrowband FM signal is depent on the message signal.

A、正确

B、错误

6、【填空题】<img src="http://edu-image.nosdn.127.net/68BC0B433CFD1BAE6FAC9B1CCD151C1B.png?imageView Then the power of the modulated signal W;

A、

7、【填空题】<img src="http://edu-image.nosdn.127.net/18E6DC5B2E4AC972BABF8F985AA2418D.png?imageViewthen the frequency deviation of the signal is Hz

A、

8、【填空题】<img src="http://edu-image.nosdn.127.net/D8F1EC73C09917F12DD1DC0B433F20F2.png?imageViewThen the deviation ratio is

A、

9、【填空题】<img src="http://edu-image.nosdn.127.net/C6C771990CCF862EB05D2C9264A89618.png?imageView by Carson’rule, the transmission bandwidth of s(t) is kHz

A、

10、【填空题】An FM signal is modulated by m(t)=sin(2000πt), kf=100. The bandwidth B of the baseband signal m(t) is __Hz.

A、

第三章单元测试-1

1、【单选题】The resolution of full high definition television (Full HD) is 1920×1080 and the frame rate is 60 Hz. For each pixel, the quantization levels of different color samplings (R, G, B) are all set to 256. Then, the number of bits per second and the minimum bandwidth required to transmit this video signals are about T and W (Hz), respectively, where the channel SNR=30(dB). Hint: C=W*log2(1+SNR).

A、T=300M, W=30M

B、T=3000M, W=1000M

C、T=3000M, W=300M

D、T=1000M, W=300M

2、【单选题】In a digital communication system, the Nyquist interval of signal <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_61baa20a-4447-4874-9d15-5d24edfa2862.png" /> should be millisecond (ms).

A、1.25

B、2.5

C、5

D、10

3、【单选题】An analog signal m(t) with zero mean is a stationary process. Its frequency range is 0(Hz) ~ 8000(Hz) and its amplitude is uniformly distributed between -5(V) ~ +5(V). Then, the minimum Nyquist sampling frequency for this signal m(t) is f (Hz) , the average power is P (W). Assuming a uniform quantizer for this signal and the step size is D=0.04(V), the minimum number of quantization bits is R .

A、f=8000, P=25, R=8

B、f=16000, P=25/2, R=7

C、f=8000, P=25/3, R=9

D、f=16000, P=25/3, R=8

4、【单选题】A signal s(t)=3cos(20pt) (V) is quantized by a uniform quantizer, the step size of the quantizer is 0.1(V), then the minimal number of quantization level is L , the number of bits per sample is at least R , and the variance of the quantization error is T (<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_403581f1-b813-47ec-998f-ab1aeca9e6ca.png" />).

A、L=60, R=5, T=0.000833

B、L=30, R=5, T=0.000833

C、L=60, R=5, T=0.001667

D、L=60, R=6, T=0.000833

5、【单选题】A compact disk (CD) is used to store music. Suppose that both the two independent channels of the true stereo music with the highest frequency 22.05 kHz are sampled at the Nyquist sampling rate, then the sampling rate for each channel is f (kHz). The encoded PCM is to have an average SNR of at least 96 dB. Then, the minimum number of the uniform quantization of the sampled data should be R bits. If the Beethoven's Symphony No. 9 with 74 minutes in PCM data can be stored in CD, the minimum storage capacity of the CD should be T (MB, Megabyte). (Hint: <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_c604d8b7-2492-4154-ad98-49f07efcbd8f.png" />).

A、f=44.1, R=16, T=783

B、f=22.05, R=16, T=392

C、f=44.1, R=15, T=700

D、f=44.1, R=16, T=392

6、【单选题】A 1G bytes flash memory is used to store PCM data. Suppose that a VF (voice-frequency) signal is sampled at 8kHz and the PCM data with R bits quantization is to have an average SNR of at least 30dB. Then, about T hours of VF signal in PCM data can be stored in this flash memory. (Hint: <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f2b6d9ce-c2fc-47e2-b407-ce5bcb0b1c3b.png" />).

A、T=111.11

B、T=55.56

C、T=27.78

D、T=13.89

第三章单元作业

第三章章节测试

1、【单选题】In a voice transmission system, the sampling frequency is 8000Hz, and it is used to multiplex 12 independent voice inputs based on an 8-bit PCM word. The bit duration is about (ms, microsecond)

A、125

B、15.6

C、1.3

D、10.4

2、【单选题】32 voice signals are sampled uniformly and then time-division multiplexed. The sampling operation uses flat-top with 1(μs) duration. The highest frequency component of each voice signal is 3.4 kHz. Assuming a sampling rate of 8 kHz, the spacing between successive pulses of the multiplexed signal is (μs). If the Nyquist rate sampling rate is used, repeat the calculation is (μs)

A、2.9, 3.6

B、3.9, 4.6

C、125, 147

D、4.9, 5.6

3、【单选题】A linear delta modulator is designed to operate on speech signals limited to 3.4 kHz. The sampling rate is 12 fs, where fs is the Nyquist rate of speech signal. The step size Δ=100(mV). The modulator is tested with a 1 (kHz) sinusoidal signal. The maximum amplitude of this test signal required to avoid slope overload is ______(V).

A、8.16

B、0.1

C、1.3

D、1.5

4、【单选题】In a Delta Modulation (DM) system, A sinusoidal test signal of amplitude Am=1(V) and frequency fm = 1 (kHz) is applied to the system. The sampling rate is fs = 8 (kHz) ，to avoid slope overload, the step size Δ is at least (V).

A、0.125

B、0.785

C、1.57

D、0.3925

5、【单选题】There are eight analog signals, each of bandwidth W=2(kHz). Samples of these signals are time-division-multiplexed, quantized and binary-coded. The step size Δ of the quantizer cannot be greater than 0.5% of the peak amplitude mp. The sampling rates (kHz) is 50% above the Nyquist rate and the minimum number of quantization levels should be .

A、6, 100

B、12, 200

C、24, 200

D、48, 400

6、【单选题】In a voice transmission system (the highest frequency fh = 4kHz), the Nyquist sampling frequency is used, and it is used to multiplex _______ independent voice inputs. Each input voice signal is quantized by an R-bits PCM word to achieve average SNR of at least 48(dB), where the maximum bit duration is set to Tb = 3.125(ms)

A、3

B、4

C、5

D、6

7、【判断题】DM requires a sampling rate much higher than the Nyquist Rate.

A、正确

B、错误

8、【判断题】Aliasing refers to the phenomenon of a high-frequency component in the spectrum of the signal seemingly taking on the identity of a lower frequency in the spectrum of its sampled version.

A、正确

B、错误

9、【判断题】For both m-law and A-law, the signal-to-noise (SNR) of low-level and high-level signals improve with the increasing m and A.

A、正确

B、错误

10、【判断题】Performance of a PCM system is only affected by quantization noise.

A、正确

B、错误

11、【判断题】In the sampling process, if the sampling period is larger than the Nyquist interval, then the sampled signal can be completely described by the sample values.

A、正确

B、错误

12、【判断题】One of the important advantages of pulse-code modulation (PCM) is the robustness to channel noise and interference.

A、正确

B、错误

13、【填空题】Noise in a pulse-code modulation (PCM) system includes noise and noise. While, in a linear delta modulator, there is a special quantization error caused by distortion.

A、

14、【填空题】Basic operations performed in the transmitter of a pulse code modulation system include , , and .

A、

15、【填空题】In a differential encoding system, a transition denotes symbol 0 and no transition denotes symbol 1. Symbol 1 is used as reference bit. If a binary data sequence with length eight bits { 1011 } is the input to this system, the output sequence is { 1 , 10000110}.

A、