Qpsk transmitter and receiver ppt

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Quadrature Phase Shift Keying (QPSK) Transmitter and Receiver

Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document.Documentation Help Center. The receiver addresses practical issues in wireless communications, such as carrier frequency and phase offset, timing drift and frame synchronization. The receiver demodulates the received symbols and outputs a simple message to the Diagnostic Viewer.

This example model performs all processing at complex baseband to handle a static frequency offset, a timing drift, and Gaussian noise. To cope with the above-mentioned impairments, this example provides a reference design of a practical digital receiver, which includes correlation-based coarse frequency compensation, PLL-based fine frequency compensation, PLL-based symbol timing recovery, frame synchronization, and phase ambiguity resolution.

The top-level structure of the model is shown in the following figure, which includes the Transmitter subsystem, the channel subsystem, and the Receiver subsystem.

The detailed structures of the Transmitter subsystem and the Receiver subsystem are illustrated in the following figures. Raised Cosine Transmit Filter - Uses a rolloff factor of 0. Raised Cosine Receive Filter - Uses a rolloff factor of 0. Coarse Frequency Compensation - Estimates an approximate frequency offset of the received signal and corrects it.

Symbol Synchronizer - Resamples the input signal according to a recovered timing strobe so that symbol decisions are made at the optimum sampling instants. Carrier Synchronizer - Compensates for the residual frequency offset and the phase offset. Frame Synchronizer - Aligns the frame boundaries at the known frame header. Data Decoding - Resolves the phase ambiguity caused by the Carrier Synchronizerdemodulates the signal, and decodes the text message.

Each frame contains 20 'Hello world ' messages and a header. The first 26 bits are header bits, a bit Barker code that has been oversampled by two. The Barker code is oversampled by two in order to generate precisely 13 QPSK symbols for later use in the Data Decoding subsystem of the receiver model.

The remaining bits are the payload. The payload correspond to the ASCII representation of 'Hello world ', where ' ' is a repeating sequence of '', '', '', The payload is scrambled to guarantee a balanced distribution of zeros and ones for the timing recovery operation in the receiver model.

The modulated symbols are upsampled by two by the Raised Cosine Transmit Filter with a roll-off factor 0. The symbol rate of the transmitter system is 50k symbols per second, and the sample rate after the Raised Cosine Transmit Filter is k samples per second.

Then it adds a variable delay with a choice of the following two types of delay to the signal:. Ramp delay - This type of delay is initialized at DelayStart samples, and increases linearly at a rate of DelayStep samples in each frame. When the actual delay reaches one frame, the delay buffer is full, and it maintains a delay of one frame. Triangle delay - This type of delay linearly changes back and forth between MinDelay samples and MaxDelay samples at a rate of DelayStep samples in each frame.

The use of multiple delay characteristics allows you to investigate their effects on receiver performance, particularly on the Symbol Synchronizer block. The Raised Cosine Receive Filter provides matched filtering for the transmitted waveform with a rolloff factor of 0. The received signal amplitude affects the accuracy of the carrier and symbol synchronizer.

Therefore the signal amplitude should be stabilized to ensure an optimum loop design. The AGC output power is set to a value ensuring that the equivalent gains of the phase and timing error detectors keep constant over time.

Simulation of QPSK transmitter and receiver for LTE in SystemVue

The AGC is placed before the Raised Cosine Receive Filter so that the signal amplitude can be measured with an oversampling factor of two, thus improving the accuracy of the estimate. You can refer to Chapter 7. The Coarse Frequency Compensation subsystem corrects the input signal with a rough estimate of the frequency offset. The following diagram shows the subsystem, in which the frequency offset is estimated by averaging the output of the correlation-based algorithm of the Coarse Frequency Compensator block.

There is usually a residual frequency offset even after the coarse frequency compensation, which would cause a slow rotation of the constellation. The Carrier Synchronizer block compensates for this residual frequency.

QPSK Transmitter and Receiver in Simulink

The accuracy of the Coarse Frequency Compensator decreases with its maximum frequency offset value. Ideally, this value should be set just above the expected frequency offset range.Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. See our User Agreement and Privacy Policy. See our Privacy Policy and User Agreement for details.

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qpsk transmitter and receiver ppt

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qpsk transmitter and receiver ppt

The receiver addresses practical issues in wireless communications, such as carrier frequency and phase offset, timing drift and frame synchronization. The receiver demodulates the received symbols and outputs a simple message to the Diagnostic Viewer.

qpsk transmitter and receiver ppt

This example model performs all processing at complex baseband to handle a static frequency offset, a timing drift, and Gaussian noise. To cope with the above-mentioned impairments, this example provides a reference design of a practical digital receiver, which includes correlation-based coarse frequency compensation, PLL-based fine frequency compensation, PLL-based symbol timing recovery, frame synchronization, and phase ambiguity resolution.

The top-level structure of the model is shown in the following figure, which includes the Transmitter subsystem, the channel subsystem, and the Receiver subsystem. The detailed structures of the Transmitter subsystem and the Receiver subsystem are illustrated in the following figures.

Raised Cosine Transmit Filter - Uses a rolloff factor of 0. Raised Cosine Receive Filter - Uses a rolloff factor of 0. Coarse Frequency Compensation - Estimates an approximate frequency offset of the received signal and corrects it. Symbol Synchronizer - Resamples the input signal according to a recovered timing strobe so that symbol decisions are made at the optimum sampling instants.

Carrier Synchronizer - Compensates for the residual frequency offset and the phase offset. Frame Synchronizer - Aligns the frame boundaries at the known frame header. Data Decoding - Resolves the phase ambiguity caused by the Carrier Synchronizerdemodulates the signal, and decodes the text message.

qpsk transmitter and receiver ppt

Each frame contains 20 'Hello world ' messages and a header. The first 26 bits are header bits, a bit Barker code that has been oversampled by two. The Barker code is oversampled by two in order to generate precisely 13 QPSK symbols for later use in the Data Decoding subsystem of the receiver model.

The remaining bits are the payload.

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The payload correspond to the ASCII representation of 'Hello world ', where ' ' is a repeating sequence of '', '', '', The payload is scrambled to guarantee a balanced distribution of zeros and ones for the timing recovery operation in the receiver model.

The modulated symbols are upsampled by two by the Raised Cosine Transmit Filter with a roll-off factor 0. The symbol rate of the transmitter system is 50k symbols per second, and the sample rate after the Raised Cosine Transmit Filter is k samples per second.These signals are then streamed from target to Simulink via the ad block.

The Simulink model is shown in the figure below, where the blocks of Tx and Rx are grouped in two subsystems. In order to run this example, your MATLAB version should be b or higher, and your license needs to include the following components:. In this example, we set up the target using the block's properties dialog and a configuration file. You can double click the ad block in the model to find out the properties dialog settings.

You can open the ad 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 detailed description of each block can be found at MathWorks Help Document. With everything set up properly, we can run the model and get the results below.

As we can see, with the frequency compensation and the timing recovery, we can get a clear QPSK constellation. Analog Devices Wiki. Analog Devices Wiki Resources and Tools.

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Education Content. Engineering Discovery Program. Wiki Help. About Wiki. This version 05 Jun was approved by dpu. The Previously approved version 26 Jan is available. The QPSK receiver is shown in the figure below, which consists of the following blocks: An automatic gain control block.


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