Title :
A PDA approach to CDMA multiuser detection
Author :
Luo, J. ; Pattipati, K. ; Willett, P. ; Hasegawa, F.
Author_Institution :
ECE Dept., Connecticut Univ., Storrs, CT, USA
fDate :
6/23/1905 12:00:00 AM
Abstract :
A probabilistic data association (PDA) method is proposed in this paper for multiuser detection over synchronous code division multiple access (CDMA) communication channels. PDA models the undecided user signals as binary random variables. By approximating the interuser interference (IUI) as Gaussian noise with an appropriately elevated covariance matrix, the probability associated with each user signal is iteratively updated. Computer simulations show that the system usually converges within 3-4 iterations, and the resulting probability of error is very close to that of the optimal maximum likelihood (ML) detector. Further modifications are also presented to significantly reduce the computational cost
Keywords :
Gaussian noise; adjacent channel interference; code division multiple access; covariance matrices; error statistics; iterative methods; mobile radio; multiuser channels; Gaussian noise; IUI; PDA; binary random variables; code division multiple access; communication channels; covariance matrix; error probability; interuser interference; iterative updating; multiuser detection; probabilistic data association; synchronous CDMA; Communication channels; Computer simulation; Covariance matrix; Gaussian noise; Interference; Maximum likelihood detection; Multiaccess communication; Multiuser detection; Personal digital assistants; Random variables;
Conference_Titel :
Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE
Print_ISBN :
0-7803-7206-9
DOI :
10.1109/GLOCOM.2001.965521
