Title :
A new geometrical interpretation of the decorrelator in multiuser CDMA
Author :
Rasmussen, Lars E. ; Lim, Teng J. ; Alexander, Paul D.
Author_Institution :
Centre for Wireless Commun., Nat. Univ. of Singapore, Singapore
Abstract :
We present a new geometrical interpretation of the multiuser CDMA decorrelator. This interpretation relates the output of the decorrelator to the subspace spanned by the spreading codes. The interpretation makes it clear that a decision feedback detector based on the soft outputs from a decorrelator and a multistage detector with a soft output first stage decorrelator do not provide any performance improvement over the single stage decorrelator. These conclusions are confirmed by analytical results
Keywords :
code division multiple access; codes; correlation methods; feedback; signal detection; decision feedback detector; decorrelator output; geometrical interpretation; multistage detector; multiuser CDMA decorrelator; soft outputs; spreading codes; subspace; Amplitude estimation; Decorrelation; Detectors; Interference cancellation; Matrices; Mobile communication; Multiaccess communication; Multiple access interference; Output feedback; Wireless communication;
Conference_Titel :
Global Telecommunications Conference, 1996. GLOBECOM '96. 'Communications: The Key to Global Prosperity
Conference_Location :
London
Print_ISBN :
0-7803-3336-5
DOI :
10.1109/GLOCOM.1996.591902
