Sender Channel output Zm Data bits Code 1111 Time slot 1 channel output Time slot o channel output 11-11-1 Time slot 1 Time slot o Receiver d1 =-1 Time slot 1 received input receved input Time slot o Code 1 111 Figure 6.5 A simple CDMA example: sender encoding, receiver ing Q # 9: for the two-sender , two-receiver example, give an example of two CDMA codes containing 1 and -1 values that do now allow the two receivers to extract the original transmitted bits from the two CDMA senders