PHYSICAL LAYER AND TRANSMISSION MEDIA
BANDWIDTH UTILIZATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -Explanation: Fast frequency hopping occurs if there is more than one frequency hop during each transmitted symbol. Thus, in fast frequency hopping the hopping rate equals or exceeds the information symbol rate.
Detailed explanation-2: -Explanation: A frequency hopped system provides a level of security, especially when a large number of channels are used. Since, an unintended receiver that does not know the pseudorandom sequence of frequency slots must retune rapidly to search for the signal it wishes to intercept.
Detailed explanation-3: -In fast frequency hopping (FFH), multiple frequency hops are utilized for transmitting one data bit. When the fast frequency hopping spread spectrum technique is employed, the ratio TS/TH is greater than unity, where TS is the duration of the information signal or symbol and TH is the frequency hopping time.
Detailed explanation-4: -Explanation: Slow frequency hopping is several modulation per frequency hop. Explanation: Fast frequency hopping is several frequency hops per modulation.