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problem 1: Describe the difference between slow FHSS and fast FHSS.

problem 2: What do you mean by direct sequence spread spectrum?

problem 3: What is the relationship between bit rate of a signal before and after it has been encoded by using DSSS?

problem 4: What do you mean by CDMA?

problem 5: Suppose that we wish to transmit a 56-kbps data stream by using spread spectrum.

a) Find out the channel bandwidth needed when SNR = 0.1, 0.01 and 0.001.

b) In an ordinary (not spread spectrum) system, a reasonable goal for bandwidth efficiency might be 1 bps/Hz. That is to transmit a data stream of 56 kbps; a bandwidth of 56 kHz is used. In this case, Find out the minimum SNR which can be endured for transmission devoid of appreciable errors? Compare to spread spectrum case?

problem 6: An FHSS system employs a total bandwidth of WS = 400 MHz and an individual channel bandwidth of 100 Hz. Find out the minimum number of PN bits needed for each frequency hop?

problem 7: The given table describes the operation of an FHSS system for one complete period of the PN sequence.

563_operation of FHSS system.jpg

a) Determine the period of PN sequence?
b) The system makes use of a form of FSK. What form of FSK is it?
c) Determine the number of bits per symbol?
d) Determine the number of FSK frequencies?
e) Determine the length of a PN sequence per hop?
f) Is this slow or fast FHSS?
g) Determine the total number of possible hops?
h) Show the variation of the dehopped frequency with time.

problem 8: The given table describes the operation of a FHSS system by using the same PN sequence as in the problem above.

1154_pn sequence.jpg

a) Determine the period of PN sequence?
b) The system makes use of a form of FSK. What form of FSK is it?
c) Determine the number of bits per symbol?
d) Determine the number of FSK frequencies?
e) Determine the length of a PN sequence per hop?
f) Is this slow or fast FHSS?
g) Determine the total number of possible hops?
h) Display the variation of the dehopped frequency with time.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M97273

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