Title :
Multistage multiuser detection for CDMA with space-time coding
Author :
Zhang, Yumin ; Blum, Rick S.
Author_Institution :
Dept. of Electron. Eng. & Comput. Sci., Lehigh Univ., Bethlehem, PA, USA
Abstract :
The combination of turbo codes and space-time block codes is studied for use in CDMA systems. Each user´s data are first encoded by a turbo code. The turbo coded data are next sent to a space-time block encoder which employs a BPSK constellation. The space-time encoder output symbols are transmitted through the fading channel using multiple antennas. A multistage receiver is proposed using nonlinear MMSE estimation and a parallel interference cancellation scheme. Simulations show that with reasonable levels of multiple access interference (p⩽0.3), near single user performance is achieved. The receiver structure is generalized to decode CDMA signals with space-time convolutional coding and similar performance is observed
Keywords :
block codes; channel coding; code division multiple access; convolutional codes; decoding; fading channels; interference suppression; least mean squares methods; multiuser channels; nonlinear estimation; phase shift keying; receivers; signal detection; turbo codes; BPSK constellation; CDMA; channel coding; convolutional coding; decoding; fading channel; multiple access interference; multiple antennas; multistage receiver; multiuser detection; nonlinear MMSE estimation; parallel interference cancellation; performance; simulations; space-time block codes; turbo codes; Binary phase shift keying; Block codes; Decoding; Fading; Interference cancellation; Multiaccess communication; Multiple access interference; Multiuser detection; Transmitting antennas; Turbo codes;
Conference_Titel :
Statistical Signal and Array Processing, 2000. Proceedings of the Tenth IEEE Workshop on
Conference_Location :
Pocono Manor, PA
Print_ISBN :
0-7803-5988-7
DOI :
10.1109/SSAP.2000.870068
