Title :
A blind space-time adaptive multiuser detector for DS-CDMA communication systems
Author :
Kwak, Jaeyoung ; Lu, I-Tai
Author_Institution :
Center of Adv. Technol. in Telecommun., Polytech. Univ., Brooklyn, NY, USA
Abstract :
A novel blind space-time algorithm for multiuser detection with interference rejection in DS-CDMA cellular communication systems is presented. Beamforming and equalization are performed simultaneously where complex weights are adaptively determined by a hybrid combination of the constant modulus algorithm and the decision-directed algorithm. The adaptive scheme converges approximately after 100 iteration steps when the input SNR is 10 dB. The performance of the proposed approach is as good as the least mean square approach using training sequences. A 20 dB enhancement of SINR is obtained when the maximum difference of the received signal power is up to 6 dB
Keywords :
adaptive equalisers; adaptive signal detection; cellular radio; code division multiple access; convergence of numerical methods; correlation methods; interference suppression; iterative methods; land mobile radio; matrix algebra; pseudonoise codes; radiofrequency interference; spread spectrum communication; DS-CDMA cellular communication systems; SINR; beamforming; blind space-time adaptive multiuser detector; blind space-time algorithm; complex weights; constant modulus algorithm; convergence; cross correlation matrix; decision-directed algorithm; equalization; input SNR; interference rejection; iteration; least mean square approach; received signal power; synchronous DS-CDMA system; training sequences; Adaptive signal detection; Additive noise; Cost function; Decorrelation; Delay effects; Detectors; Equalizers; Intersymbol interference; Multiaccess communication; Sampling methods;
Conference_Titel :
Communications, 1998. ICC 98. Conference Record. 1998 IEEE International Conference on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-4788-9
DOI :
10.1109/ICC.1998.685175
