Overview on Linear Multiuser Equalizers for DS-CDMA Systems

The ideas and basic principles of multiuser receivers for code-division multiple-access (CDMA) systems are summarized and reviewed. Linear multiuser receiver formulation and combination of MAI suppression with multipath and antenna combining is the main contribution of the chapter. The multiuser equalization can be performed either after maximal ration combining or there can be a separate equalizer in each rake receiver branch. If the latter choice is made, the correlation of noise in the equalizer outputs needs to be taken into consideration when selecting the combining weights. Efficient bit error probability (BEP) evaluation methods for such linear receivers with uncoded transmission are also presented. Thirdly, chip equalizers for downlink are described. Their major advantage is that they are applicable also in CDMA systems where the period of spreading sequences is significantly longer than the data symbol period.

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