Title :
On the effect of power and channel estimation in equalized blind PIC for downlink multirate CDMA communications
Author :
Mouhouche, Belkacem ; Abed-Meraim, Karim ; Ibrahim, Nicolas
Author_Institution :
TSI Dept., Ecole Nat. Superieure des Telecommun., Paris, France
Abstract :
In this paper, we discuss blind parallel interference cancellation (PIC) in the downlink of W-CDMA. Due to the multirate nature of W-CDMA, different spreading factors exist. This makes the estimation of interferers´ codes difficult. We propose a method based on fast Walsh transform (FWT) to estimate interfering codes. Another important aspect is the estimation of interferers´ powers, which is a critical issue in any interference cancellation (IC) scheme. We propose a method based on averaging the output power of different virtual users along with their occurrence. Two receivers are considered: chip-level equalizer followed by PIC, and rake receiver followed by PIC.
Keywords :
Walsh functions; blind equalisers; broadband networks; channel coding; channel estimation; code division multiple access; interference suppression; radio links; radio receivers; FWT; PIC; blind equalizer; blind parallel interference cancellation; channel estimation; chip-level equalizer; fast Walsh transform; interfering codes; multirate W-CDMA downlink; power estimation; rake receiver; wideband code division multiple access; Blind equalizers; Channel estimation; Downlink; Fading; Interference cancellation; Multiaccess communication; Multipath channels; Multiple access interference; Multiuser detection; Performance gain;
Conference_Titel :
Signals, Systems and Computers, 2004. Conference Record of the Thirty-Eighth Asilomar Conference on
Print_ISBN :
0-7803-8622-1
DOI :
10.1109/ACSSC.2004.1399207
