DocumentCode :
1604694
Title :
Space-time coded soft-iterative multiuser receivers for WCDMA
Author :
Hernandez, Marco ; Collados, Manel ; Janssen, Gerard
Author_Institution :
Dept. of Electr. Eng., Delft Univ. of Technol., Netherlands
Volume :
1
fYear :
2002
fDate :
6/24/1905 12:00:00 AM
Firstpage :
120
Abstract :
This paper proposes a soft-iterative multiuser receiver of low complexity, based on the principle of turbo decoding. A serially concatenated system is used, where every user employs a convolutional code, interleaver, space-time block code (STBC) and the spreading operation. The proposed receiver uses a soft-input soft-output (SISO) multiuser detector-decoder, which is basically a soft interference canceller for the space-time coded wideband code division multiple access (WCDMA) signal. In each iteration, extrinsic information is interchanged between the different SISO blocks giving asymptotically unbiased estimates. The introduction of STBC adds decorrelation between the different user signals, relaxing the interleaver design and less iterations are needed for the system to converge. The receiver allows the use of a less complex soft matched filter instead of a minimum mean square error (MMSE) filter. It achieves nearly single-user performance, and gives an excellent trade-off between implementation complexity and performance for advanced WCDMA multiuser receivers.
Keywords :
block codes; broadband networks; code division multiple access; concatenated codes; convolutional codes; interference suppression; iterative decoding; matched filters; mobile radio; radio receivers; radiofrequency interference; turbo codes; SISO multiuser detector-decoder; STBC; W-CDMA; WCDMA; convolutional code; decorrelation; implementation complexity; interleaver; iterations; serially concatenated system; soft interference canceller; soft matched filter; soft-input soft-output multiuser detector decoder; soft-iterative multiuser receiver; space-time block code; space-time coded soft-iterative multiuser receivers; space-time coded wideband code division multiple access; spreading operation; turbo decoding; user signals; Block codes; Concatenated codes; Convolutional codes; Decoding; Decorrelation; Interference cancellation; Matched filters; Multiaccess communication; Signal design; Wideband;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 2002. VTC Spring 2002. IEEE 55th
Print_ISBN :
0-7803-7484-3
Type :
conf
DOI :
10.1109/VTC.2002.1002676
Filename :
1002676
Link To Document :
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