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(Solved): (4) Suppose a synchronous CDMA network has one base station and three mobile ...
![(4) Suppose a synchronous CDMA network has one base station and three mobile users
\( [10] \) Alice, Bob, and Carol. Below ar](https://media.cheggcdn.com/media/41e/41ec9a60-f8c8-4450-af8b-8e7a52fef9e7/php2T9ENs)
(4) Suppose a synchronous CDMA network has one base station and three mobile users \( [10] \) Alice, Bob, and Carol. Below are the chip sequences of the three users Alice: \( (1,1,-1,-1) \) Bob: \( (-1,1,1,-1) \) Carol: \( (1,1,1,1) \) (a) Base station has received the bits \( (-1,1,-1,-3,1,-1,-3,-1) \). Which mobile user(s) 7' transmitted and what bits they have each transmitted? (d) Another mobile user Ted wants to join the CDMA network. Design a chip sequence 3' for Ted so that transmission of Ted will not interfere with others'.
Expert Answer
(a) To determine which mobile user transmitted the bits (-1, 1, -1, -3, 1, -1, -3, -1), we can use the correlation property of CDMA. Specifically, we