Addition of signals in simulink

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Abbey Stock 2020-12-10

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回答： Kranti Balaga 2021-5-24

Hi,

I have two signals I would like to add together using simulink (Inphase and Quadrature). These would have to be added using a signal from t = 0- 1 from inphase, then t = 0-1 quadrature, then t = 1-2 inphase, t = 1-2 quadrature etc..

How would i do this without using the QPSK demodulator block? I already have the inphase and quadrature signals in two differrent 'streams'

Thanks

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Chirag Nighut 2020-12-15

In order to add 2 signals and combine into one signal, you can use the Simulink merge block present in the Signal Routing library.

To know more about the same refer the following link: https://www.mathworks.com/help/simulink/slref/merge.html

Abbey Stock 2020-12-15

Hi, thanks for your answer. However this does not merge the signals in the way i need. Is there a way to add them as in one inphase timestep, one quadrature timestep, one inphase timestep, one quadrature...

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Answer 1

Kranti Balaga 2021-5-24

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Hi,

To demodulate the I and Q signals without using QPSK demodulator block can be done for the hard decision. You can get I and Q signals in two different streams and give it to the hard decision using the following block by setting a constant value to 'zero'

Determine how signal compares to specified constant - Simulink (mathworks.com)

You will get bit outputs.

For combining real I and real Q to complex data, you can use

Convert real and/or imaginary inputs to complex signal - Simulink (mathworks.com)