Title :
Comparative performance of adaptive receivers for demodulating IS-95 downlink data
Author :
Lai, Kuei-Chiang ; Cagley, Richard E. ; Shynk, John J. ; Motamed, Mariam ; Gooch, Richard P.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
Abstract :
The performance of adaptive receiver architectures is investigated for demodulating IS-95 downlink data. The implementations include an adaptive minimum mean-square-error (MMSE) equalizer followed by a despreader, and an adaptive successive interference canceler (SIC), which are compared to a conventional matched filter (MF). By concentrating on an actual signal model (IS-95) and multipath channels, we address technical issues that other structures might not emphasize for generic CDMA (code-division multiple-access) signals. For the SIC, we are concerned with estimating the multipath channel as well as the relative user amplitude levels in order to regenerate a portion of the received signal due to a particular base station. Significant performance gains can be achieved by accurately identifying and equalizing for a base station channel using the pilot channel of the IS-95 downlink signal
Keywords :
adaptive equalisers; adaptive signal detection; demodulation; error statistics; filtering theory; interference suppression; land mobile radio; least mean squares methods; matched filters; multipath channels; multiuser channels; radio links; radio receivers; radiofrequency interference; BER; CDMA signals; IS-95 downlink data demodulation; IS-95 downlink signal; adaptive MMSE equalizer; adaptive receiver architectures; adaptive receivers; adaptive successive interference canceler; base station; base station channel equalization; code-division multiple-access; despreader; matched filter; minimum mean-square-error; multipath channels; multiuser detection; performance; pilot channel; received signal regeneration; relative user amplitude levels; signal model; Amplitude estimation; Base stations; Downlink; Equalizers; Interference cancellation; Matched filters; Multiaccess communication; Multipath channels; Performance gain; Silicon carbide;
Conference_Titel :
Adaptive Systems for Signal Processing, Communications, and Control Symposium 2000. AS-SPCC. The IEEE 2000
Conference_Location :
Lake Louise, Alta.
Print_ISBN :
0-7803-5800-7
DOI :
10.1109/ASSPCC.2000.882510
