Title :
A RAKE-DFSE equalizer for the UMTS downlink
Author :
Boujemaa, Hatem ; Visoz, Raphael ; Berthet, Antoine
Author_Institution :
France Telecom R&D, Issy-les-Moulineaux, France
fDate :
6/24/1905 12:00:00 AM
Abstract :
The UMTS radio interface based on CDMA, has been designed to offer a wide range of data rates using variable spreading factor. It is ongoing standardization effort to include a high data rate packet mode in the downlink direction. This new mode is called high speed downlink packet access (HS-DPA) and is characterized by the giving up of closed loop power control, link adaptation using variable constellations (QPSK, MAQ16,MAQ64), and low spreading factor. The proposed receiver is particularly adapted to HSDPA mode has it gives close to optimal performance even in the case of high modulation order and low spreading factor while keeping a reasonable complexity.
Keywords :
cellular radio; code division multiple access; decision feedback equalisers; intersymbol interference; least mean squares methods; multiuser channels; radio links; radio receivers; sequential estimation; signal detection; spread spectrum communication; CDMA; HSDPA mode; ISI; RAKE receiver; RAKE-DFSE equalizer; UMTS downlink; UMTS radio interface; channel estimation; data aided estimator; data rates; high data rate packet mode; high modulation order; high speed downlink packet access; low complexity iterative receiver; low spreading factor; minimum mean square error; multiuser interference; optimal performance; simulation results; soft-input soft-output DFSE detector; spreading sequences; standardization; variable spreading factor; 3G mobile communication; Decoding; Downlink; Equalizers; Fading; Intersymbol interference; Multiaccess communication; Multipath channels; RAKE receivers; Time division multiple access;
Conference_Titel :
Vehicular Technology Conference, 2002. VTC Spring 2002. IEEE 55th
Print_ISBN :
0-7803-7484-3
DOI :
10.1109/VTC.2002.1002895
