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Iterative multiuser detection with integrated channel estimation for coded DS-CDMA

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1 Author(s)
A. Lampe ; Lehrstuhl fur Informationsubertragung, Erlangen-Nurnberg Univ., Erlangen, Germany

A practically interesting approach for iterative channel estimation, multiuser detection, and single-user decoding based on maximum a posteriori symbol-by-symbol estimation for direct sequence/code-division multiple-access (DS-CDMA) is proposed. The receiver relies on the output of a bank of matched filters for each user and each path, and combines interference cancellation with iterated soft-decision feedback to improve channel estimation accuracy and data symbol reliability in course of a few iterations. We show that in this way, near single-user channel phase and amplitude estimation accuracy is achieved for frequency-selective fading channels, even in highly loaded systems, and illustrate that reliable data symbol estimation can be performed.

Published in:

IEEE Transactions on Communications  (Volume:50 ,  Issue: 8 )