GATE 2022 EC – Question 35
A symbol stream contains alternate QPSK and 16-QAM symbols. If symbols from this stream are transmitted at the rate of 1 mega-symbols per second, the raw (uncoded) data rate is ________ mega-bits per second (rounded off to one decimal place).
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Correct answer: 3
Explanation
QPSK carries 2 bits per symbol and 16-QAM carries 4 bits per symbol. With the two alternating, the average is $\frac{2+4}{2}=3$ bits per symbol, so the rate is $3\times1=3$ Mbps.