QPSK implementation in simulink

Jan 21, 2024#数字通信81

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This post is translated from Chinese into English through AI.View Original

AI-generated summary

The given text is a technical description of a digital communication system. It includes information about various modules and parameters involved in the modulation and demodulation processes. It also mentions the QPSK signal power spectrum density and the effects of AWGN channel and carrier synchronization. The text concludes by stating that the system successfully achieves QPSK modulation and demodulation.

Modulation Section#

Overall Framework#

Parameters of Each Module#

Raised cosine roll-off factor for the roll-off filter is 1
image.png|500
Unipolar/Bipolar Conversion

Waveforms of Each Stage#

Buffer#

Demux#

Raised Cosine Transmit Filter#

QPSK Signal Power Spectral Density#

Demodulation Section#

After passing through the AWGN channel, assuming carrier synchronization has been performed

Parameters of Some Modules#

Carrier Module#

image.png|475

Pulse Generator#

image.png|500
Due to the serial-to-parallel conversion, the data rate is halved

Some Waveforms#

After the initial signal is delayed for a certain period of time, it is aligned with the demodulated output signal in the oscilloscope, and it can be found that QPSK modulation and demodulation are basically achieved