What is QPSK transmitter and receiver?
This model shows the implementation of a QPSK transmitter and receiver with Simulink®. The receiver addresses practical issues in wireless communications, such as carrier frequency and phase offset, timing drift and frame synchronization.
What is QPSK transmitter?
The Quadrature Phase Shift Keying QPSK is a variation of BPSK, and it is also a Double Side Band Suppressed Carrier DSBSC modulation scheme, which sends two bits of digital information at a time, called as bigits.
How does QPSK transmitter work?
At the transmitter input, the message signal bits are separated as even bits and odd bits using a bit splitter. These bits are then multiplied with the same carrier waveform to generate Even QPSK and Odd QPSK signals. The Even QPSK signal is phase shifter by 90°, using a phase shifter, before modulation.
Which is the first block in the QPSK modulator system?
The first value is the BER, the second value is the number of incorrect bits, and the third value is the total number of bits received. Set the simulation time to 10 seconds. In both QPSK Modulator and Demodulator blocks, set the Constellation ordering to Gray. Take a note of the constellation points.
Why is QPSK used?
QPSK allows the signal to carry twice as much information as ordinary PSK using the same bandwidth. QPSK is used for satellite transmission of MPEG2 video, cable modems, videoconferencing, cellular phone systems, and other forms of digital communication over an RF carrier.
What is a symbol duration of QPSK?
In QPSK, the phase-shift θ(t) assumes one of the four constant values for every two input bits (i.e., the entire duration of a symbol), depending on the two consecutive bits being transmitted.
What is the phase shift introduced in QPSK?
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 the principle of QPSK?
What are the components of a QPSK transmitter and receiver?
The QPSK Transmitter is shown in the figure below, which mainly consists of a baseband QPSK modulator, a raised cosine filter, and a gain block to scale up the signals before transmission: The QPSK receiver is shown in the figure below, which consists of the following blocks:
What is the difference between qpsktransmitter and qpskchannel?
1) QPSKTransmitter.m: generates the bit stream and then encodes, modulates and filters it. 2) QPSKChannel.m: models the channel with carrier offset, timing offset, and AWGN. 3) QPSKReceiver.m: models the receiver, including components for phase recovery, timing recovery, decoding, demodulation, etc.
How do I configure the QPSK transmitter in the ad9361?
You can double click the ad9361 block in the model to find out the properties dialog settings. You can open the ad9361.cfg to look into the configuration file. The QPSK Transmitter is shown in the figure below, which mainly consists of a baseband QPSK modulator, a raised cosine filter, and a gain block to scale up the signals before transmission:
How does QPSK work in Simulink®?
For the Simulink® implementation of the same system, refer to the QPSK Transmitter and Receiver in Simulink example. The transmitted QPSK data undergoes impairments that simulate the effects of wireless transmission such as addition of Additive White Gaussian Noise (AWGN), introduction of carrier frequency and phase offset, and timing drift.