Title :
Varying length equalizer for WCDMA system
Author :
Wei, Xusheng ; Cruickshank, David G M ; Mulgrew, Bernard
Author_Institution :
Dept. of Electr. & Electron. Eng., Edinburgh Univ., UK
Abstract :
In the downlink of synchronous CDMA, the orthogonality of spreading codes will be ruined by the frequency selective multipath channel. Losing of orthogonality causes the multiple access interference (MAI). To suppress the MAI, linear equalizers were proposed which can partially restore the orthogonality of spreading codes before dispreading. In this paper, a new adaptive equalizer using the least mean square (LMS) algorithm was proposed which can adjust its length according to the condition of the propagation channel. The simulation results show that the performance of the new equalizer is significantly better than that of the conventional RAKE receiver.
Keywords :
adaptive equalisers; broadband networks; code division multiple access; error statistics; interference suppression; least mean squares methods; mobile radio; multipath channels; radio links; radio receivers; radiofrequency interference; RAKE receiver; WCDMA system; frequency selective multipath channel; least mean square algorithm; multiple access interference; spreading codes; synchronous code division multiple access; varying length equalizer; Bit error rate; Downlink; Equalizers; Fading; Finite impulse response filter; Frequency; Interference suppression; Multiaccess communication; Multipath channels; RAKE receivers;
Conference_Titel :
Signal Processing and Information Technology, 2003. ISSPIT 2003. Proceedings of the 3rd IEEE International Symposium on
Print_ISBN :
0-7803-8292-7
DOI :
10.1109/ISSPIT.2003.1341131
