Code Division Multiple Access (chi hair straighteners) systems have been widely applied in the third generation mobile communication (3G) systems due to its huge capacity, soft switch, high frequency utilization and strong ability of interference resistance. In chi flat iron systems, multiple access interference (MAI) is the main factor that influences the system performance and the system capability. How to reduce this kind of interference has draw much attention recently chi hair straighteners years. Multi-user detection (MUD) can effectively reduce multiple access interference and improve system capabilities which make it to be a key technology of 3G systems. Its main purpose is to detect the interest user or all users from a mutually interference sequence.This paper takes Lacoste Polo system as research object. The research significance and current research status were analysis. Firstly, the signal model of hair straighteners system is researched, traditional methods of multi-user detection and their performances is given.
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