The maximum data rate of any single wireless link can be described by the shannon’s theorem which is related to the（）in hertz，and the（）on the channelA．signal frequency B．bandwidth C．carrier frequency D．noise frequency A．signal B．caeeier C．noise D．da

题目

The maximum data rate of any single wireless link can be described by the shannon’s theorem which is related to the（）in hertz，and the（）on the channel

A．signal frequency B．bandwidth C．carrier frequency D．noise frequency A．signal B．caeeier C．noise D．data signal

相似考题

1.● Although a given waveform. may contain frequencies over a very broad range, as a practical matter any transmission system will be able to accommodate only a limited band of （71） . This, in turn, limits the data rate that can be carried on the transmission （72） . Asquare wave has an infinite number of frequency components and hence an infinite （73） . However, the peak amplitude of the kth frequency component, kf, is only 1/k, so most of the （74） in this waveform. is in the first few frequency components. In general, any digital waveform. will have （75） bandwidth. If we attempt to transmit this waveform. as a signal over any medium, the transmission system will limit the bandwidth that can be transmitted.（71）A. frequencies B. connections C. diagrams D. resources（72）A. procedure B. function C. route D. medium（73）A. source B. bandwidth C. energy D. cost（74）A. frequency B. energy C. amplitude D. phase（75）A. small B. limited C. infinite D. finite（71）A. frequenciesB. connectionsC. diagramsD. resources（72）A. procedureB. functionC. routeD. medium（73）A. sourceB. bandwidthC. energyD. cost（74）A. frequencyB. energyC. amplitudeD. phase（75）A. smallB. limitedC. infiniteD. finite

2.An alternator is being paralleled with one on the line At the instant the circuit breaker is close, the frequency of the incoming alternator will normallyA.increaseB.not changeC.decreaseD.be exactly 60 hertz

3.In(71), multiple transmission can occupy a single link sectioned by time rather than frequency.A．FDMB．TDMC．WDMD．CDM

4.Although a given waveform. may contain frequencies over a very broad range，as a practical matter any transmission system will be able to accommodate only a limited band of (71) ．This，in turn，limits the data rate that can be carried on the transmission (72) ．Asquare wave has an infinite number of frequency components and hence an infinite (73) ．However, the peak amplitude of the kth frequency component，kf，is only 1/k，so most of the (74) in this wavefonn is in the first few fiequency components．In general，any digitalwaveform. will have (75) bandwidth．If we attempt to transmit this waveform. as a signalover any medium，the transmission system will limit the bandwidth that can be transmitte（71）A．frequenciesB．connectionsC．diagramsD．resources

更多“The maximum data rate of any single wireless link can be described by the shannons theorem which is related to the（）in hertz，and the（）on the channelA．signal frequency B．bandwidth C．carrier frequency D．noise frequency A．signal B．caeeier C．noise D．data sign”相关问题

  • 第1题：

    Which of the following wireless standards has the highest maximum data rate?()

    A.802.11n

    B.802.11b

    C.802.11a

    D.802.11g


    参考答案：A

  • 第2题：

    CDMA for cellular system can be described as follows. As with FDMA, each cell is allocated a frequency （71） , when is split into two parts, half for reverse (mobile unit to base station) and half for （72） (base station to mobile unit). For full-duplex （73） , a mobile unit both reverse and forward channels. Transmission is in the form. of direct-sequence spread （74） , which used a chipping code to increase the data rate of the transmission, resulting is an increased signal bandwidth. Multiple access is provided by assigning （75） chipping codes to multiple users, so that the receiver can recover the transmission of an individual unit from multiple transmissions.

    A.ware

    B.signal

    C.bandwidth

    D.domain


    正确答案：C
    用于蜂窝系统的CDMA技术可以描述如下。就像FDMA一样，每一个小区被分配了一个频带，该频带划分为两半，一半用于反向信道（从移动终端到基站），一半用于正向信道（从基站到移动终端）。在全双工通信中，移动终端使用了反向和正向两个信道。传输以直接序列扩频方式进行，用一个码片来增加传输的数据速率，同时也产生了额外的信号带宽。通过把正交的各个码片指定给不同的用户就可以实现多路访问，这样接收者就能够从多个传输中提取并恢复需要的传输单元。

  • 第3题：

    Loran-C is which type of navigation system ________．

    A.Hyperbolic，long-range navigation system

    B.Short-range electronic

    C.Long-range，high frequency navigation system

    D.Long-range，with a frequency of 1950 kHz


    正确答案：A

  • 第4题：

    When can routine communications be resumed on a frequency or channel on which radio silence has been imposed ________．

    A.After determining that the frequency or channel appears to be no longer in use

    B.After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications

    C.After the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded

    D.Routine communications can resume if，in the Master's opinion，communications on that frequency or channel will not interfere with emergency communications


    正确答案：C

  • 第5题：

    CDMA for cellular systems can be described as follows.As with FDMA，each cell is allocated a frequency（ ），which is split into two parts,half for reverse（mobile unit to base station）and half for（ ）（base station to mobile unit）.For full-duplex（ ）.a mobile unit uses both reverse and forwardchannels.Transmission is in the form of direct-sequence spread（本题）,which uses a chipping code to increase the data rate of the transmission,resulting inan increased signal bandwidth.Multiple access is provided by assigning（ ）chipping codes to multiple users,so that the receiver can recover the transmission of an individual unit from multiple transmissions.

    A.structure
    B.spectrum
    C.stream
    D.strategy

    答案：B
    解析：
    见下题

  • 第6题：

    Which of the following wireless technologies is primarily setup for video/audio and the frequency is 5 GHz?（）

    • A、Cellular
    • B、802.11a
    • C、802.11b
    • D、Satellite

    正确答案:B

  • 第7题：

    FDM的英文是（）

    • A、Overload Frequency Division Multiplexing 
    • B、Orthogonal Frequency Division Multiplexing 
    • C、Overwhelming Frequency Division Multiplexing 
    • D、Outstanding Frequency Division Multiplexing

    正确答案:B

  • 第8题：

    Which of the following displays has the HIGHEST Hz frequency?（）

    • A、Plasma
    • B、LED
    • C、CRT
    • D、LCD

    正确答案:A

  • 第9题：

    单选题
    If you know that the vessel you are about to call on the VHF radio maintains a radio watch on both the working and the calling frequencies，which frequency should you call on? （）
    A

    Calling frequency

    B

    Distress frequency

    C

    Urgency frequency

    D

    Working frequency


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    When it is accepted to remain on the frequency indicated，you should say（）.
    A

    Standing by on VHF frequency

    B

    Coming to VHF frequency

    C

    VHF frequency. is the best place for you to stay by

    D

    remaining in frequency. and do not change


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    A call between any two ship stations on an intership working frequency shall have a maximum duration of（）.
    A

    2 minutes

    B

    3 minutes

    C

    4 minutes

    D

    5 minutes


    正确答案： B
    解析： 暂无解析

  • 第12题：

    单选题
    When can routine communications be resumed when radio silence has been imposed?（）
    A

    After determining that the frequency or channel appears to be no longer in use

    B

    After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications

    C

    Routine communications can resume after the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded

    D

    If，in the Master's opinion，communications on that frequency will interfere with emergency communications


    正确答案： B
    解析： 暂无解析

  • 第13题：

    OFDM的英文是()

    A.OverloadFrequencyDivisionMultiplexing

    B.Orthogonal?Frequency?Division?Multiplexing

    C.Overwhelming?Frequency?DivisionMultiplexing

    D.Outstanding?Frequency?Division?Multiplexing


    正确答案：B

  • 第14题：

    You are attempting to parallel two AC generators, and the synchroscope(同步器) pointer is revolving in the fast direction. This indicates that the frequency of the incoming machine is ______.

    A.higher than the bus frequency

    B.lower than the bus frequency

    C.the same as the bus frequency but out of phase with it

    D.the same as the bus frequency and the circuit breaker may be closed at any pointer position


    正确答案：A

  • 第15题：

    What is the action that a GMDSS Radio Operator should take when a DSC distress alert is received ________．

    A.No action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequency

    B.The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was received

    C.The Operator should immediately set continuous watch on VHF channel 70

    D.The Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received


    正确答案：B

  • 第16题：

    If you know that the vessel you are about to call on the VHF radio maintains a radio watch on both the working and the calling frequencies, which frequency should you call on ?______.

    A.Calling frequency

    B.Distress frequency

    C.Urgency frequency

    D.Working frequency


    正确答案：D
    如果你知道你船在甚高频上呼叫保持工作和职守频率，你将呼叫哪个频率？工作频率。

  • 第17题：

    Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）


    正确答案:正确

  • 第18题：

    Which of the following is not necessary to consider when surveying a potential site? （）

    • A、Space for antennas
    • B、Frequency allocation
    • C、Electrical power availability
    • D、Permission/Contract with owner
    • E、Availability of PCM link to the BSC

    正确答案:B

  • 第19题：

    OFDM的英文全称是（）

    • A、Orthogonal Frequency Division Multiplexing
    • B、Outstanding Frequency Division Multiplexing
    • C、Overwhelming Frequency Division Multiplexing
    • D、Orthogonal Frequency Division Modulation

    正确答案:A

  • 第20题：

    跳频为（）。

    • A、frequency hopping
    • B、frequency spreading
    • C、frequency sequence
    • D、chirp

    正确答案:A

  • 第21题：

    单选题
    Which of the following wireless standards uses the 5GHz frequency?（）
    A

    802.11g

    B

    802.2

    C

    802.11a

    D

    802.3


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    When can routine communications be resumed on a frequency or channel on which radio silence has been imposed? （）
    A

    After determining that the frequency or channel appears to be no longer in use

    B

    After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications

    C

    After the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded

    D

    Routine communications can resume if，in the Master's opinion，communications on that frequency or channel will not interfere with emergency communications


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    You are attempting to parallel two AC generators, and the syncope pointer is revolving in the fast directionThis indicates that the frequency of the incoming machine is （）.
    A

    higher than the bus frequency

    B

    lower than the bus frequency

    C

    the same as the bus frequency but out of phase with it

    D

    the same as the bus frequency and the circuit breaker may be closed at any pointer position


    正确答案： C
    解析： 暂无解析

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