Digital Communication Questions and Answers
Q1.
Processing gain is given as
Answer :
Wss/R & Rch/R
Q2.
In which technique is phase coherence hard to maintain?
Answer :
Frequency hopping
Q3.
Fast frequency hopping is
Answer :
1. Several modulations per hop
2. Several modulations per symbol
3. Several symbols per modulation
Q4.
A linear feedback shift register consists of
Answer :
1. Feedback path
2. Modulo 2 adder
3. Four stage register
Q5.
Which method is better?
Answer :
To share different bandwidth
Q6.
The broadband jammer jams the entire
Answer :
Wss
Q7.
Public key cryptosystem is used for the encryption of
Answer :
Session key
Q8.
These three ciphers can operate of ______ of plaintext and cipher text.
Answer :
64 bit blocks
Q9.
Which should be used first to decrypt?
Answer :
Private key
Q10.
Cipher system can be solved effectively by statistically using
Answer :
Frequency of occurrence
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