Title :
A semi-blind approach for MMSE equalization in downlink CDMA channel
Author_Institution :
Sch. of Electr. Eng. & Telecommun., New South Wales Univ., Sydney, NSW, Australia
Abstract :
We investigate the chip-level equalization using finite impulse response (FIR) equalizers for the mobile station of code division multiple access (CDMA) systems with single and multiple receive antennas. As a semi-blind method, a generalized minimum mean square error (MMSE) equalization, which combines the MMSE and blind approaches together, is investigated. It is shown that the generalized MMSE equalizer can effectively increase the number of samples to track the variation of channel and thereby performs better when the coherence time is small. In addition, we derive a closed-form solution of the MMSE and generalized MMSE equalizers for given channels.
Keywords :
adaptive equalisers; blind equalisers; code division multiple access; fading channels; land mobile radio; least mean squares methods; multiuser channels; radio links; receiving antennas; time-varying channels; transient response; FIR equalizers; LMS algorithm; MMSE equalization; adaptive equalization; blind equalizer; channel variation tracking; chip-level equalization; closed-form solution; code division multiple access; coherence time; downlink CDMA channel; finite impulse response equalizers; generalized MMSE equalizer; generalized minimum mean square error equalization; mobile station; receive antennas; semi-blind approach; semi-blind method; time-variant frequency selective fading; Binary phase shift keying; Blind equalizers; Computer simulation; Downlink; Fading; Finite impulse response filter; Mean square error methods; Mobile computing; Multiaccess communication; Multipath channels;
Conference_Titel :
Communication Systems, 2002. ICCS 2002. The 8th International Conference on
Print_ISBN :
0-7803-7510-6
DOI :
10.1109/ICCS.2002.1182439
