Real-time DSP and FPGA Implementation of Wiener LMS Based Multipath Channel Estimation in 3G CDMA Systems |
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| Authors: | Messaoud Ahmed Ouameur and Daniel Massicotte |
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| Affiliation: | (1) Laboratory of Signal and System Integration (LSSI), Department of Electrical and Computer Engineering, Université du Québec à Trois-Rivières, 3351, Boulevard des Forges, C.P. 500, Trois-Rivières, Québec, Canada, G9A 5H7 |
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| Abstract: | This paper investigates real-time DSP and FPGA implementations of a low complexity technique for asynchronous multiuser delay
acquisition and time varying channel tracking for multipath channels in WCDMA and cdma2000 systems. A multiuser-LMS-like structure
along with smoothing/prediction filters to improve tracking quality is reviewed. We investigate an efficient implementation
based on FFT/IFFT technique, under fixed-point data representation and computation constraint. The measured BER reveals that
fixed-point implementation is feasible at possibly no performance degradation. Based on real time execution made on a fixed-point
high performance DSP, the maximum number of users is 15 and 17 for the proposed method and correlator, respectively. Due to
the inherent parallelism and regular data flow FPGA implementation is suggested wherein a maximum number of users more than
80 can be afforded in Xilinx Virtex™ II Pro device.
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| Keywords: | DSP VLSI FPGA delay acquisition channel estimation Wiener LMS FFT WCDMA cdma2000 |
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