an important role

CDMA has become the mainstream technology of the third generation mobile telecommunication.CDMA system distributes orthogonal(or as orthogonal as chi hair straighteners possible) code to different users in order to realize multiple users to access the system at the same time and frequency. Due to random access and the correlation of spreading code, i.e. complete orthogonal between multiple users, it will cause the multiple access interference(MAI) in the end when hair straighteners multiple users are communicating. In order to get rid of the multiple access interference, Multiple User Detection (MUD) plays an important role.At first, this dissertation introduced the principle of cheap ralph lauren polo shirts multi-user detection and some sub-optimal multi-user detectors, and then summarized advantages and shortcomings and practical applications of MUD. The blind multiuser detection Lacoste Polo does not need any prior knowledge of the channel and the training sequence, so it is widely used in the chi dazzle mobile communication field.Secondly, this dissertation studied ICA (Independent Component ralph lauren polo shirts Analysis) algorithm, the purpose of which is to separate the independent components from the observed linear mixed independent signals from multiple channel measuring.
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