GATE EC 2014 Set 4 — Question 61
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Communications → Digital Modulation & Detection → Bandwidth of Digital Modulation
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Question
An -level PSK modulation scheme is used to transmit independent binary digits over a band-pass channel with bandwidth kHz. The bit rate is kbps and the system characteristic is a raised-cosine spectrum with excess bandwidth. The minimum value of is ________.
Correct answer
15.9 to 16.1
Solution
For an -ary PSK modulation scheme with a raised-cosine spectrum, the transmission bandwidth () is given by:where is the symbol rate and is the roll-off factor (excess bandwidth).The symbol rate is related to the bit rate by:Given:
- Bandwidth kHz Hz
- Bit rate kbps bps
- Excess bandwidth
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