Iterative multiuser detection with integrated channel estimation for coded DS-CDMA
Tóm tắt
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.
Từ khóa
#Multiuser detection #Channel estimation #Multiaccess communication #Amplitude estimation #Iterative methods #Iterative decoding #Matched filters #Interference cancellation #Output feedback #Frequency-selective fading channelsTài liệu tham khảo
juntti, 1997, performance of decorrelating multiuser receiver with data-aided channel estimation, Proc Commun Theory Mini Conf (CTMC) at IEEE Globecom, 123
10.1109/26.752814
10.1109/GLOCOM.1999.831729
10.1109/GLOCOM.1997.638402
10.1007/978-1-4615-4463-0_20
10.1109/GLOCOM.1999.827578
10.1109/ISIT.2000.866466
10.1109/49.857920
10.1109/TIT.1974.1055186
10.1109/18.850680
schramm, 1996, Modulationsverfahren fü r CDMA-Mobilkommunikationssysteme unter Berü cksichtigung von Kanalcodierung und Kanalschä tzung
viterbi, 1995, CDMA
10.1109/26.701309
10.1002/ett.4460090504
reed, 2000, iterative multi-user detection with fec on correlated multi-path channels, Proc 3rd ITG Conf Source and Channel Coding, 93
10.1109/26.774855
10.1023/A:1019145515751
10.1109/49.298053
10.1109/26.536919
10.1109/ISIT.2000.866631
haykin, 1996, Adaptive Filter Theory