8. (15 pts) In an CDMA coding scheme shown below, there are two senders using two spreading codes. First, prove that the two spreading codes of sender 1 and sender 2 are orthogonal, and show your calculation process. Secondly, please show how to calculate receiver 2's received data, and then verify whether it is the same data sent by sender 2. senders channel sums together transmissions by sender and 2 d. = 1 data bits Sender Code door channel, Zim PEAA + - 1 data Sender 2 bits code 10 Zima di com M ma M slot 1 received input slot 0 received input using same code as sender 1, receiver recovers sender l's original data from summed channel data! receiver 1 code 30