GATE EC 2026 Set 1 — Question 32
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Communications → Digital Modulation & Detection → Bandwidth of Digital Modulation
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Question
A wireless digital transmission scheme is using -QAM over an additive white Gaussian noise channel and a maximum-likelihood receiver. Consider the information bit rate from source to be bits per second.The minimum transmission bandwidth (in MHz) of the modulated signal necessary for optimum recovery of information at the receiver is __.
(rounded off to two decimal places)
(rounded off to two decimal places)
Correct answer
0.95 to 1.05
Solution
Given:
- Modulation scheme: -QAM, which means the number of symbols .
- Number of bits per symbol bits/symbol.
- Information bit rate bits per second.
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