Multi-stage MMSE weighted decision feedback multi-user detector for DS-CDMA and MC-CDMA
Resource
Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th
Journal
Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th
Pages
-
Date Issued
2003-10
Date
2003-10
Author(s)
Hsu, Chen-Chu
Lee, Yumin
DOI
1090-3038
Abstract
This paper proposes the MMSE weighted decision feedback (WDF) multiuser detector (MUD), which is an enhancement of the MMSE decision-feedback MUD. In contrast to MMSE-DF MUD, in MMSE-WDF past decisions are scaled by weighting factors that reflect their reliability. Furthermore, a multistage structure is utilized to improve the decision quality. An algorithm is also presented for jointly optimizing the reliability weighting factors and the coefficients of feedforward and feedback filters for every stage. Simulation results show that some variations of MMSE-WDF perform very closely to the single-user bound for E/sub b//N/sub 0/ lower than 25 dB and the number of active users less than 30.
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Type
journal article
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