CDMA. Using Wireless slide $19$ and $20$ as references to show the procedures that receiver $2,$ who has the same code as the sender $2,$ can recover the received encoded data.

Assume sender $1$ has the code $+1,+1,+1,-1,+1,-1,-1,-1$ and

sender $2$ has the code $+1,-1,+1,+1,+1,-1,+1,+1.$

Assume sender $1$ sends $2$ bits $-1,+1,$ and sender $2$ sends $2$ bits $-1,-1.$