Title :
Multiple access interference suppression with linear chip equalizers in WCDMA downlink receivers
Author :
Hooli, Kari ; Latva-aho, Matti ; Juntti, Markku
Author_Institution :
Centre for Wireless Commun., Oulu Univ., Finland
Abstract :
The 3rd generation cellular communications standard will be based on wideband CDMA (WCDMA). To obtain adequate performance multiuser receivers, such as LMMSE receivers, can be used. Unfortunately, previously suggested LMMSE receivers cannot be applied in WCDMA systems employing long scrambling codes. In this paper, linear receivers suitable also for downlink with long scrambling codes are studied. These receivers equalize the channel prior to the despreading, thus restoring the orthogonality of users and suppressing multiple access interference (MAI). The numerical results show that chip equalizer based receivers can offer significant performance improvement in comparison to the conventional RAKE receiver
Keywords :
broadband networks; cellular radio; code division multiple access; equalisers; interference suppression; least mean squares methods; radio receivers; radiofrequency interference; 3rd generation cellular communications standard; LMMSE receivers; W-CDMA downlink receivers; chip equalizer based receivers; linear chip equalizers; linear receivers; long scrambling codes; multiple access interference suppression; multiuser receivers; orthogonality; performance; wideband CDMA; Communication standards; Downlink; Equalizers; Fading; Multiaccess communication; Multipath channels; Multiple access interference; RAKE receivers; Transfer functions; Wideband;
Conference_Titel :
Global Telecommunications Conference, 1999. GLOBECOM '99
Conference_Location :
Rio de Janeireo
Print_ISBN :
0-7803-5796-5
DOI :
10.1109/GLOCOM.1999.831683