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it is not a rule that bandpass filter should be symmetric, examples are given by FvM.
Usually FIR filters are designed to be symmetrical so that they have a linear phase response.
1. convert -140dB into linear scale. Say it is NoiPow
2. let Sig is a vector containing your other signals
3. In Matlab type
Noise = [randn(1,length(Sig))+j*randn(1,length(Sig))]/sqrt(2);
NoisySignal = Sig + Noise*sqrt(NoiPow)
I hope I have not made a mistake here.
by the way, a noise of...
I think so.
There is a capacitance in electric cables such that they distort signals at high frequencies. So yeah I think they are frequency selective.
1. square waves? Nope, that wont generate square waves
2. initial seed is a random number that defines the generation pattern of the data. It is random so you can use any seed you like. It would not make a difference
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