Answer / Rajnikant Sharma

QPSK (Quadrature Phase Shift Keying) is used to modulate signals in wireless communication systems. In QPSK, the carrier wave is represented by two orthogonal signals that are 90 degrees out of phase with each other. The signal constellation consists of four points at 0, 90, 180, and 270 degrees. Therefore, QPSK is typically used for quadrants of 45, 135, 225, and 315 degrees to ensure that the signals are well-separated and avoid interference.

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