Title :
Iterative multi-user-antenna detector for MIMO CDMA employing space-time turbo codes
Author :
Shen, Jia ; Burr, Alister G.
Author_Institution :
Dept. of Electron., York Univ., UK
Abstract :
In this paper a synchronous multiple-input multiple-output (MIMO) uplink CDMA system employing space-time turbo codes is considered. We introduce a multiuser-antenna receiver structure to detect the multiuser and multi-antenna signal in this system. The linear minimum mean-squared error (MMSE) detector and an MMSE-based turbo parallel interference cancellation (PIC) detector are respectively utilized to suppress the multiple access interference (MAI) between users and the crosstalk between antennas at the same time. In the turbo PIC detector, the soft output of the space-time turbo decoder is fed back to improve the PIC´s performance. Using computer simulation, we examine the multiuser-antenna detectors´ performance in the block Rayleigh flat fading channel. The simulation results suggest the two multiuser-antenna receivers can both combat the interference between different users and antennas. However the iterative detector achieves a substantial performance gain over the MMSE one.
Keywords :
MIMO systems; Rayleigh channels; code division multiple access; interference suppression; iterative decoding; least mean squares methods; mobile radio; multiuser detection; space-time codes; turbo codes; MAI suppression; MIMO CDMA; PIC detector; block Rayleigh flat fading channel; crosstalk; iterative multiuser-antenna detector; linear MMSE detector; minimum mean-squared error; multiple access interference; multiple-input multiple-output uplink; performance; receiver; soft output feedback; space-time turbo codes; turbo parallel interference cancellation; Computer simulation; Crosstalk; Detectors; Fading; Interference cancellation; Iterative decoding; MIMO; Multiaccess communication; Multiple access interference; Turbo codes;
Conference_Titel :
Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE
Print_ISBN :
0-7803-7632-3
DOI :
10.1109/GLOCOM.2002.1188113