What is QPSK modulation technique?
Quadrature Phase Shift Keying (QPSK) is a form of Phase Shift Keying in which two bits are modulated at once, selecting one of four possible carrier phase shifts (0, 90, 180, or 270 degrees). QPSK allows the signal to carry twice as much information as ordinary PSK using the same bandwidth.
What is QPSK Wikipedia?
Offset QPSK (OQPSK) Offset quadrature phase-shift keying (OQPSK) is a variant of phase-shift keying modulation using four different values of the phase to transmit. It is sometimes called staggered quadrature phase-shift keying (SQPSK).
What is offset QPSK?
Offset QPSK, which involves adding a delay to one of two digital data streams used in the modulation process, reduces the maximum phase jump to 90°. Another option is π/4-QPSK, which reduces the maximum phase jump to 135°.
What is QPSK transmitter?
The transmitter includes the Bit Generation subsystem, the QPSK Modulator block, and the Raised Cosine Transmit Filter block. The Bit Generation subsystem uses a MATLAB workspace variable as the payload of a frame, as shown in the figure below. Each frame contains 20 ‘Hello world ###’ messages and a header.
Where is QPSK modulation used?
QPSK (Quadrature Phase Shift Keying) scheme is used in various applications in modern digital communication system; it provides high performance on bandwidth efficiency and bit error rate. The areas include wireless communication, mobile communication and Satellite Communication.
What is QPSK 16QAM 64QAM?
LTE devices use QPSK, 16QAM and 64QAM to modulate data and control information. The eNodeB supports all of these modulation techniques for the Down Link direction. However, 64QAM is optional in the Uplink direction. A modulation technique is selected based on the measured Signal to Noise Ratio (SNR).
Is QPSK better than PSK?
Advantages of QPSK BPSK scheme are having less probability of error but requires large bandwidth. It is possible to compress bandwidth required without increasing probability of error . This is achieved by generating mor number of symbol by combining few successive bits.
What is QPSK in LTE?
LTE devices use QPSK, 16QAM and 64QAM to modulate data and control information. The eNodeB supports all of these modulation techniques for the Down Link direction. However, 64QAM is optional in the Uplink direction. QPSK is associated with SNR 9 dB.