Title :
Performance analysis of joint EM/SAGE estimation and multistage detection in UTRA-WCDMA uplink
Author :
Guenach, M. ; Vandendorpe, L.
Author_Institution :
Commun. & Remote Sensing Lab., Univ. Catholique de Louvain, Belgium
Abstract :
This paper deals with the performance evaluation of an asynchronous UTRA-WCDMA uplink using a sequential algorithm for channel estimation and multiuser detection. A multipath slowly Rayleigh fading channel is considered. Both perfect and non-perfect channel estimations are studied with the pilot-to-data amplitude ratio as a parameter, when pilot symbols are transmitted in parallel with data. For channel estimation we use expectation maximization (EM) and spaced alternating generalized expectation maximization (SAGE) algorithms; for symbol detection we use interference cancellation. Bit Error Probabilities (BER) are derived using Monte Carlo simulations for binary phase shift keying (BPSK). The users may have different bit rates. In addition the mean squared estimation error (MSEE) of channel gains is computed and compared to the classical Cramer-Rao lower bound (CRLB)
Keywords :
Monte Carlo methods; Rayleigh channels; broadband networks; code division multiple access; error statistics; interference suppression; land mobile radio; mean square error methods; multipath channels; multiuser channels; optimisation; parameter estimation; phase shift keying; radio access networks; radio links; radiofrequency interference; signal detection; BER; BPSK; Cramer-Rao lower bound; EM algorithm; MSEE; Monte Carlo simulations; SAGE algorithm; UTRA-WCDMA uplink; Universal Terrestrial Radio Access; asynchronous UTRA-WCDMA uplink; binary phase shift keying; bit error probabilities; bit rates; channel gain; expectation maximization; interference cancellation; joint EM/SAGE estimation; mean squared estimation error; mobile radio; multipath slowly Rayleigh fading channel; multistage detection; multiuser detection; nonperfect channel estimation; perfect channel estimation; performance analysis; pilot symbols transmission; pilot-to-data amplitude ratio; sequential algorithm; spaced alternating generalized expectation maximization; symbol detection; wideband code division multiple access; Binary phase shift keying; Bit error rate; Bit rate; Channel estimation; Error probability; Estimation error; Fading; Interference cancellation; Multiuser detection; Performance analysis;
Conference_Titel :
Communications, 2000. ICC 2000. 2000 IEEE International Conference on
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-6283-7
DOI :
10.1109/ICC.2000.853574
