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QPSK modulator and demodulator

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Nitin Sapre
Nitin Sapre 2019-8-7
回答： Nitin Sapre 2019-8-12
Can anyone help me How to modulate and demodulate using LLR Data of qpsk in matlab. But without uisng objeccs
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Walter Roberson
Walter Roberson 2019-8-8
What does your textbook say that the theory of qpsk modulation is?
Nitin Sapre
Nitin Sapre 2019-8-8
It says that we need to take two bit at a time even and odd bits then multipy signals with inphase and quadratuer phase components. ul get modulated output. But How to get demodulated output using LLR I am not able to understand

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回答（2 个）

Kaashyap Pappu
Kaashyap Pappu 2019-8-12
To perform QPSK modulation and demodulation, you can use the “pskmod” and “pskdemod” functions by setting the order of modulation to 4.
The “pskmod” function is elaborated upon here, with the example of QPSK modulation provided, and the “pskdemod” function is elaborated upon here, with an example of the entire process of modulation, channel modelling and demodulation.
Hope this helps!
Nitin Sapre
Nitin Sapre 2019-8-12
Thanks for soln, but I have done with this method. I have already said that i Dont want to use objects. i need to code it fully by own means. if anyone can help me to design a modulator without using objects it will be much appretiated.

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