MMSE multiuser detection for multi-rate wideband CDMA communications

By generalizing and extending the effective user data model for multi-rate access, we precisely study the general performance of various proposed multi-rate schemes for wideband CDMA systems. A linear multiuser receiver structure with antenna arrays that can fit all the considered multi-rate schemes is therefore presented. With the extended data model and the proposed receiver structure, each multi-rate scheme is only distinguished by the bandwidth requirement and the spreading codes used. The numerical results suggest that the decision on employing which multi-rate scheme can be viewed as a trade-off between the power consumption and the hardware complexity of the receivers, as well as operating scenarios