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On Frequency Domain Doppler Diversity Using Basis Expansion Model and EM-Based Algorithms in CDMA Systems

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4 Author(s)
Tianqi Wang ; Memorial Univ. of Newfoundland, St. John's ; Cheng Li ; Hsiao-Hwa Chen ; Mohsen Guizani

In this paper, we propose an algorithm for frequency domain adaptive Doppler shift estimation in the presence of multiple Doppler subpaths in DS-CDMA systems. By modeling doubly selective channel with a basis expansion model (BEM), the proposed method works based on expectation-maximization (EM) algorithm and can accurately estimate Doppler shifts. A complete Cramer-Rao lower bound (CRLB) analysis of the estimation algorithms is also provided.

Published in:

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

Date of Conference:

26-30 Nov. 2007