flip negative value as shown bellow

if

x=[1 2 -5 7 -9 4 -6 7 -6 8 -5 2 -1 5 -6 -8 -9 7 4 -1 ]

x + = if x(k) ≥ 0

0 otherwise

x-= if x(k) < 0

0 otherwise

. The positive signal x +(k) is transmitted in the first subframe .

the second subframe is used to carry the flipped (inverted polarity) signal −x −(k)

then send full signal

[darova]

Do you have any attempts? Any ideas how to implement this?

[abdullah qasim]

yes by using " if and otherelse "

or using another method

[madhan ravi]

Post the attempted code.

[darova]

please

Answer 1

[Gokul]

You question is not very clear to me, but for the first part of it, I belive you want to this:

x=[1 2 -5 7 -9 4 -6 7 -6 8 -5  2 -1 5 -6 -8 -9 7 4 -1];
y=x+(x>=0)*2-1