Correct Answer - Option 3 : 600 symbols / sec
Concept:
Baud rate is defined as the number of symbols transmitted per second. It is also known as the symbol rate.
For M -array PSK baud rate is given as:
\(Baud\;rate = \frac{{Bit\;rate}}{{{{\log }_2}M}}\)
For QPSK, M = 4
\( Baud \ Rate = \ \frac{R_b}{log_24}=\frac{R_b}{2}\)
So, Baud Rate and symbols per second are often used interchangeably.
Calculation:
Given:
Information Rate = 900 bits/sec
\(Forward \ Error \ Correction \ (FEC)=\frac{3}{4}\)
\(R_b =900 \ \times \ \frac{4}{3}\)
Rb = 1200 bits/sec
For QPSK modulation,
\(Symbol \ Rate=\frac{1200}{2}\)
Symbol Rate =600 symbols/sec
