How to analyse spectrum for frequency and magnitude in simulink

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rotmart 2016-5-9

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https://ww2.mathworks.cn/matlabcentral/answers/283338-how-to-analyse-spectrum-for-frequency-and-magnitude-in-simulink

评论： Jyotish Robin 2016-8-1

Hi,

my goal is to analyse an ofdm-signal at the receiver site. I think therefor i have to sweep the FFT output for frequency and magnitude detection. With the magnitude i will conclude on the transmitted data for each subcarrier / frequency.

Now i worked out an easy ofdm-transmitter with three added frequencies, which should be modulated with a bitstream later.

But that output signal wasn't that i expected.

The same in detail:

So what did i wrong with the fft-signal or how can i use the complex signal for my application?

How is the complex signal made of and how can i sweep all frequencies for their magnitude?

Best regards!

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Jyotish Robin 2016-8-1

It is not clear from your model what are some of the inputs of the "add" block you used. Kindly specify them. It will be useful if you could provide the following additional details: