Topic: Communication Systems
The bandwidth required for QPSK modulated channel is
- A. Twice the BW of BPSK
- B. Equal to BPSK
- C. Equal to FSK
- D. Half of the BW of BPSK
Answer: D. Half of the BW of BPSK
Explanation: Quadrature Phase Shift Keying (QPSK) transmits 2 bits per symbol, while Binary Phase Shift Keying (BPSK) transmits 1 bit per symbol. For the same total bit rate, the symbol rate in QPSK is halved, meaning the required transmission bandwidth is half that of BPSK.