Title :
Iterative multiuser receiver/decoders with enhanced variance estimation
Author_Institution :
Lab. of Telecommun. Technol., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
We study the impact of variance estimation on a receiver, where the soft information provided by the channel decoder is utilized in the multiuser detection. Specifically, we consider a receiver structure that resembles the structure of an iterative decoder for a serially concatenated code, but where the inner constituent decoder is replaced by an interference cancellation (IC) unit. The system performance with three different variance estimator methods is studied through numerical simulations. The results show that the variance estimation method has a great impact on the receiver performance especially in the case, where the different users are received with different powers
Keywords :
channel coding; code division multiple access; concatenated codes; convolutional codes; interference suppression; iterative decoding; land mobile radio; multiuser channels; parameter estimation; phase shift keying; radio receivers; radiofrequency interference; signal detection; spread spectrum communication; BPSK modulation; DS-CDMA communication system; channel decoder; convolutional channel coding; interference cancellation unit; iterative decoder; iterative multiuser receiver/decoders; multiuser detection; numerical simulations; receiver performance; serially concatenated code; soft information; system performance; variance estimation; Algorithm design and analysis; Channel coding; Concatenated codes; Covariance matrix; Interference cancellation; Iterative algorithms; Iterative decoding; Multiaccess communication; Multiuser detection; Numerical simulation;
Conference_Titel :
Vehicular Technology Conference, 1999 IEEE 49th
Conference_Location :
Houston, TX
Print_ISBN :
0-7803-5565-2
DOI :
10.1109/VETEC.1999.778481