Spread Spectrum MCQ

Test your knowledge with important Spread Spectrum MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Spread Spectrum MCQs at Bissoy

• In DSSS the signal is recovered using
  ক

  Low pass filter

  খ

  High pass filter

  গ

  Band pass filter

  ঘ

  Band stop filter
• The original bandwidth of the unspread signal in spread spectrum is ____ to data rate.
  ক

  Proportional

  খ

  Inversely proportional

  গ

  Not related

  ঘ

  None of the mentioned
• In CDMA the incoming signal is _____ with the spreading code.
  ক

  Added

  খ

  Multiplied

  গ

  XOR-ed

  ঘ

  None of the mentioned
• Which filter is used to get the final FHSS signal?
  ক

  Low pass filter

  খ

  High pass filter

  গ

  Band pass filter

  ঘ

  Band stop filter
• The transmitter of frequency hopping system is fed with encoding scheme such as
  ক

  Frequency shift keying

  খ

  Binary phase shift keying

  গ

  Frequency & Binary phase shift keying

  ঘ

  None of the mentioned
• The width of each channel in frequency hopping spread spectrum corresponds to
  ক

  Bandwidth of input signal

  খ

  Pseudorandom sequence used

  গ

  Carrier frequency

  ঘ

  None of the mentioned
• Spread spectrum has immunity from
  ক

  Noise

  খ

  Multi-path distortion

  গ

  Noise & Multi-path distortion

  ঘ

  None of the mentioned
• Spread spectrum makes ______ difficult.
  ক

  Jamming

  খ

  Interception

  গ

  Jamming & Interception

  ঘ

  None of the mentioned
• Spread spectrum can be used to transmit
  ক

  Analog data

  খ

  Digital data

  গ

  Analog & Digital data

  ঘ

  None of the mentioned
• Spread spectrum is a ______ technique.
  ক

  Encoding

  খ

  Decoding

  গ

  Encoding & Decoding

  ঘ

  None of the mentioned
• In a fast FH spread spectrum system, the information is transmitted via FSK with non coherent detection. Suppose there are N = 3 hops/bit with hard decision decoding of the signal in each hop. The channel is AWGN with power spectral density 0.5No and an SNR 20 ~13 dB (total SNR over the three hops). The probability of error for this system is
  ক

  0.013

  খ

  0.0013

  গ

  0.049

  ঘ

  0.0049
• An FH binary orthogonal FSK system employs an m 15 stage liner feedback shift register that generates an ML sequence. Each state of the shift register selects one of L non over lapping frequency bands in the hopping pattern. The bit rate is 100 bits/s. The demodulator employ non coherent detection. Suppose the hop rate is increased to 2 hops/bit and the receiver uses square law combining the signal over two hops. The hopping bandwidth for this channel is?
  ক

  3.2767 MHz

  খ

  13.1068 MHz

  গ

  26.2136 MHz

  ঘ

  1.6384 MHz
• An FH binary orthogonal FSK system employs an m 15 stage liner feedback shift register that generates an ML sequence. Each state of the shift register selects one of L non over lapping frequency bands in the hopping pattern. The bit rate is 100 bits/s. The demodulator employ non coherent detection. If the hop rate is one per bit, the hopping bandwidth for this channel is?
  ক

  6.5534 MHz

  খ

  9.4369 MHz

  গ

  2.6943 MHz

  ঘ

  None of the mentioned
• A rate 1/2 convolution code with dfrec = 10 is used to encode a data sequence occurring at a rate of 1 kbps. The modulation is binary PSK. The DS spread spectrum sequence has a chip rate of 10 MHz. The processing gain is?
  ক

  14 dB

  খ

  37 dB

  গ

  58 dB

  ঘ

  104 dB
• A rate 1/2 convolution code with dfrec = 10 is used to encode a data sequence occurring at a rate of 1 kbps. The modulation is binary PSK. The DS spread spectrum sequence has a chip rate of 10 MHz.The coding gain is?
  ক

  7 dB

  খ

  12 dB

  গ

  14 dB

  ঘ

  24 dB
• A fast FH/MFSK system has the following parameters. Number of bits per MFSK symbol = 4 Number of pops per MFSK symbol = 4 The processing gain of the system is
  ক

  0 dB

  খ

  7 dB

  গ

  9 dB

  ঘ

  12 dB
• A slow FH/MFSK system has the following parameters. Number of bits per MFSK symbol = 4 Number of MFSK symbol per hop = 5 The processing gain of the system is
  ক

  13.4 dB

  খ

  37.8 dB

  গ

  6 dB

  ঘ

  26 dB
• A pseudo-noise (PN) sequence is generated using a feedback shift register of length m = 4. The chip rate is 107 chips per second. The period of PN sequence is?
  ক

  1.5 µs

  খ

  15 µs

  গ

  6.67 ns

  ঘ

  0.67 ns
• A pseudo-noise (PN) sequence is generated using a feedback shift register of length m = 4. The chip rate is 107 chips per second. The chip duration will be?
  ক

  1µs

  খ

  0.1 µs

  গ

  0.1 ms

  ঘ

  1 ms
• A pseudo-noise (PN) sequence is generated using a feedback shift register of length m = 4. The chip rate is 107 chips per second. What is the PN sequence length?
  ক

  10

  খ

  12

  গ

  15

  ঘ

  18