My goal was to visualize the time domain response of this modulation, before and after the channel(Ignore the square root filter).
To do that I had to build a separate block that multiplies the real component of the output of the BPSK modulator with cosine and imag component with the sinusoid.
These sinusoids have 1000 samples in 1 bit interval.
My question here is:
Why do I have to change the input power in the Gaussian Channel(I am using EbNo mode), when I am not directly influencing the path?
If you look at the third picture, I get bad results.
If you look the input sequence and the output sequence, you can see that they are nothing alike. Output sequence is just gibberish.
http://pokit.org/get/?6d63083533acaff03ad39facfc2d562c.jpg
And all of this because I took the output of the AWGN channel, ran it through my block(to multiply and all that) and plot it on the scope.(We are talking about subsystem6 on the picture)
If I however change the input power to be 0.001 Watts, instead of 1 OR delete the subsystem6 entirely(so I am not plotting output of the AWGN channel) this problem is gone
I get this:
http://pokit.org/get/?7951de81dcbc9e3591e149b6ddc64f43.jpg![]()
To do that I had to build a separate block that multiplies the real component of the output of the BPSK modulator with cosine and imag component with the sinusoid.
These sinusoids have 1000 samples in 1 bit interval.
My question here is:
Why do I have to change the input power in the Gaussian Channel(I am using EbNo mode), when I am not directly influencing the path?
If you look at the third picture, I get bad results.
If you look the input sequence and the output sequence, you can see that they are nothing alike. Output sequence is just gibberish.
http://pokit.org/get/?6d63083533acaff03ad39facfc2d562c.jpg
And all of this because I took the output of the AWGN channel, ran it through my block(to multiply and all that) and plot it on the scope.(We are talking about subsystem6 on the picture)
If I however change the input power to be 0.001 Watts, instead of 1 OR delete the subsystem6 entirely(so I am not plotting output of the AWGN channel) this problem is gone
I get this:
http://pokit.org/get/?7951de81dcbc9e3591e149b6ddc64f43.jpg