How to convert binary wave to analog sine wave in simulink matlab r2016b?

I want to convert a digital/binary signal received at "Rectangular 16QAM demodulator" block into an analog sine wave signal in the simulink, matlab.

Please help.

Answer 1

[Walter Roberson]

You need a hardware output block of some kind. The appropriate blocks to use are going to depend upon the digital to analog hardware that you have available.

[kshama PATEL]

Thank you for your quick response.

i would like to describe my project that i am currently working on.

I am working on matlab r2016b simulink with the already available model in the documentation "RF Satellite Link". (Please click the link here to see the model https://in.mathworks.com/help/comm/examples/rf-satellite-link.html?s_tid=srchtitle. OR Please open the model by typing "RF satellite link" in the 'help' menu of matlab r2016b. And run the simulation to obtain the results.

(You can find the photo of the model as an attachment to this message.))

This model simulates RF signal in the form of bernoulli binary numbers as an input to the satellite downlink transmitter and hence, getting received at the satellite downlink receiver section. The results are then seen in the form of constellation diagrams and power spectrum.

My project work in this model is to replace the "bernoulli binary" block in the tramsmitter section with a "sine wave" block and hence simulate the model to obtain the output in the form of a sine wave.

Please help to simulate this model with the sinusoidal wave as the input(in the satellite downlink transmitter section) and to get a sinusoidal wave in analog form as the output(in the satellite downlink receiver section).

Please Help.

[Walter Roberson]

I think you are falling into the same error as I discussed in https://www.mathworks.com/matlabcentral/answers/321197-how-do-i-write-matlab-code-for-a-1-bit-dac#comment_430543

Analog means a real physical signal of some sort. It could be vibrating air carrying sound waves; it could be an electric current; it could be an electromagnetic wave; it could be a laser being beamed through a fibre optic cable; and so on. If it is not being acted upon by physical processes, then it is not an analog signal.

Therefore if you want to convert to analog, as you have indicated that you do, then you need to pick an actual output device.

My guess is that you do not want to convert to analog: I think you want to simulate analog. If I am correct, then you need to decide what kind of analog processes you want to simulate.

[kshama PATEL]

yes, i want to simulate analog.

Basic idea is to make a "sinusoidal signal" at the input of the transmitter section of "RF Satellite Link model" compatible with the "rectangular 16-QAM modulator" block and obtain the results in the form of constellation diagram.

Please click the link to have a look at the model https://in.mathworks.com/help/comm/examples/rf-satellite-link.html. or find its picture an an attachment to this message.

I want to replace "bernoulli binary generator" block with a "sine wave" block and then simulate the same.

I tried doing the simulation but i am getting only 8 constellation points out of 16. you can find the picture of modified sinewave model and the corresponding simulated result as an attachment to this message.

Please help me to obtain all the 16 constellation points in the constellation diagram with the input as sine wave at the transmitter section of the "RF Satellite Link" model.

Thank you.