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Subspace based channel estimation for downlink W-CDMA

Abstract : In wideband code division multiple access (W-CDMA) systems, inter-symbol interference (ISI) introduced by multipath propagation can be significant due to large multipath delays. In the presence of multipath, each signal is subjected to frequency-selective fading and the orthogonality condition is distorted due to increased cross-correlation between the signature waveforms of the different users. In this paper, we study a subspace-based signature waveform estimation for downlink W-CDMA systems that provides estimates of the multiuser channels by exploiting the second-order statistics of the transmitted signal at the base station. We employ multiple antennas at the receiver to estimate the signature waveforms for overloaded systems. A zero-forcing equalizer and a matched-filter detector are employed to estimate the received signal constellations. Simulations are performed to evaluate the effectiveness of the algorithm.
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https://hal.univ-lorraine.fr/hal-03045170
Contributor : Kondo Adjallah <>
Submitted on : Monday, December 7, 2020 - 9:53:00 PM
Last modification on : Tuesday, January 5, 2021 - 3:27:28 AM

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  • HAL Id : hal-03045170, version 1

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Vidhyacharan Bhaskar, Laurie Joiner, K. Adjallah. Subspace based channel estimation for downlink W-CDMA. International Journal of Pure and Applied Mathematics, Academic Publishing Ltd, 2005. ⟨hal-03045170⟩

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