Help me model ISI channel in Matlab

[leony]

Hello,
If I have a channel impulse response like δ(t) + 2*δ(t-Ts), how can I model this in Matlab?
I realized it should be like h=[1 0 0] or sth like that. But I do not know what the matrix elements mean. Can anyone help me?
Thanks...

 

[leony]

ISI channel

I am really stuck. Please help...

 

[Sal]

ISI channel

Hi

as you know time is a continuous variable, however in order to manipulate it in Matlab, you need to create a discretized time, then define the variable t = 0:Increment:Limit, where Increment is the minimum sampling time you require and Limit is the highest value in time, (e.g. t=0:0.001:1), now you decide the units, it may be secondos, nanoseconds, or any other.

About your function, Lets choose Incremet in such a way that mod(Ts,Increment) =0; mod is the modulus function which you can find in the matlab help documentation. Then T/Increment = Ats; Now the channel impulse response is something like this

ch = [1 0 ... 2 0 ... 0]; The entry number 2 occurs at the Ats element of ch, and the number of "0s" at the right of 2 depend on you.

I recommed reading the matlab help pages, since this are very basic concepts.

see ya

Sal

 

[changfa]

Re: ISI channel

Put simply, you can work with discrete model, as Sal suggested, and choose your time interval as Ts (for simplicity w.l.o.g.). Then your data sequence should convolve with channel response, which is h=[1 2];