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Unit 5
CHOOSE THE CORRECT ANSWER
1. If ‘a‘ is an element of a Field ‘F‘, then its additive inverse is
(a) -a
(b) 0
(c) a
(d) 1
2. Relative to Hard decision decoding, soft decision decoding results in
(a) better coding gain
(b) lesser coding gain
(c) less circuit complexity
(d) better bit error probability
3. .Under error free reception, the syndrome vector computed for the received cyclic
codeword consists of
(a) alternate 0‘sand1‘sstartingwitha0
(b) all zeros
(c) all ones
(d) alternate1‘s and 0‘ss tartingwitha1
4. Error free communication may be possible by
(a) increasing transmission power to the required level
(b) providing redundancy during transmission
(c) increasing the channel bandwidth
(d) reducing redundancy during transmission
5. A discrete source X is transmitting m messages and is connected to the receiver Y through
asymmetric channel. The capacity of the channel is given as
(a) H(X)+H(Y)-H(X,Y)bits/symbol
(b) log m-H(X/Y)bits/symbol
(c) log m-H(Y/X)bits/symbol