Question

A communication system uses Quadrature Phase Shift Keying (QPSK) modulation for transmission

When the information symbols are mapped into the carrier phase θ according to the rules shown in Table 1, provide the expressions for the QPSK signals.

Symbol (0,0) (1,0) (1,1) (0,1)
Phase, θ π/4 3π/4 5π/4 7π/4

Answer 1

QPSK signals are obtained by mapping information symbols to specific carrier phases. (0,0) is mapped to π/4, (1,0) to 3π/4, (1,1) to 5π/4, and (0,1) to 7π/4.

Step-by-step explanation:

The QPSK signals are obtained by mapping the information symbols to specific carrier phases. In QPSK modulation, each symbol is represented by two bits.

The symbol (0,0) is mapped to a carrier phase of π/4, symbol (1,0) is mapped to a carrier phase of 3π/4, symbol (1,1) is mapped to a carrier phase of 5π/4, and symbol (0,1) is mapped to a carrier phase of 7π/4.