Using MIMO with DS-CDMA and spread spectrum

1. How is spread spectrum used in CDMA?
2. What is DS CDMA?

How is spread spectrum used in CDMA?

To permit this without undue interference between the users, CDMA employs spread spectrum technology and a special coding scheme (where each transmitter is assigned a code). CDMA optimizes the use of available bandwidth as it transmits over the entire frequency range and does not limit the user's frequency range.

What is DS CDMA?

DS-CDMA (Direct-Sequence Code Division Multiple Access) is a multiple access scheme based on DSSS, by spreading the signals from/to different users with different codes. It is the most widely used type of CDMA.