Q 18,page 2,june 12. Page Shift Keying (PSK) Method is used to modulate digital signal at 9600 bps using 16 level. Find the line signals and speed (i.e. modulation rate).

 Options (A) 2400 bauds            (B) 1200 bauds             (C) 4800 bauds (D) 9600 bauds

Answer (A) 2400 bauds.

Explanation.

Bit rate is the number of bits per second where as baud rate is the number of signals per second. If a signal is made of n bits then bit rate is n times higher than baud rate. ex if a signal is of 4 bits and 1000 signals are sent per second then baud rate is 1000baud/sec and bit rate is 4000bps.psk is noise immune and requires low bandwidth.

In psk of 16 levels,uses 4 bits (log ₂16=4)per signal. When bit rate is 9600bps then baud rate is 2400.