Use cdma to construct the aggregate frame for two denders s1 frame 0 , s2 frame 1, the code for s1 is (+1,-1,+1,+1,+1,-1,+1,+1), the code for s2 is (-1,+1,-1,-1,-1,+1,-1,-1)

I tried to solve it but I am not sure.
I multiplied s1 code by -1 and s2 code by +1

and then I added the two codes , and i got this answer : ( -2,+2,-2,-2,-2,+2,-2,-2)
Is this correct?

This question needs expansion. Supply some background since the topic is pretty specific to some system not all of us have used.

Me? Yes I worked in cellular design but mostly on the control section of base stations. Hardware design mostly and working with the team that did the actual coding.

Read https://www.daniweb.com/programming/threads/435023/read-this-before-posting-a-question

I bet that some classroom text book is required to put your post into context. Be sure to add that book title or what class exercise this is from.