This is simplest optimization routine. Using this algorithm optimization parameters are changed separately in each step. Only one parameter can be changed in one step while other are helt as constants.
Xk+1=Xk+ΔXk , k=0,1,2,…
ΔXk step of parameter Xk. Parameter is changed until function growth is noticed, and then next parameter follows and so on. After [...]

Impulse signal can be represented as:
d[n] = 1, if n=0
d[n] = 0, otherwise
it can also be written like d=[1,0,0,0,…]
Impulse Response
The impulse response h(n) is the response of filter L() at time n to unit impulse occurring at time 0.
h(n)=L(d(n))
Lets see how discrete system can be described when impulse response is known
We know that:

In the linear [...]