Groupwise successive interference cancellation for multirate CDMA based on MMSE criterion

Document Type

Conference Proceeding

Publication Date

12-3-2000

Abstract

In this work, group-wise successive interference cancellation scheme for multi-rate CDMA signals is proposed. The proposed detector works based on the Minimum Mean Square Error (MMSE) criterion. It has the promise of decision feedback interference cancellation for superior performance comparing to the linear MMSE detection at the cost of moderate increasing in complexity. In group-wise detection, users are grouped according to their processing gain or data rate, i.e., users with same processing gain or data-rate are grouped together, then detected. Users with the lowest processing gain or highest data rate are detected first, neglecting the presence of the other users in the system. Interference between the groups is cancelled in a successive order. The BER of the groupwise successive MMSE interference canceler is compared with the BER multi-rate linear MMSE detector and multi-rate decorrelating detector. The results show that the groupwise successive MMSE interference canceler yields better performance than multi-rate linear MMSE detector and multi-rate decorrelating detector. When the system is highly loaded, the groupwise successive MMSE interference canceler can offer better performance than multi-rate linear MMSE detector and multi-rate conventional detector.

Identifier

0033681685 (Scopus)

Publication Title

IEEE International Conference on Communications

First Page

1174

Last Page

1178

Volume

2

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