Browsing by Subject "Basis expansion model (BEM)"
Now showing items 1-3 of 3
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Channel Estimation for TDS-OFDM Systems in Rapidly Time-Varying Mobile Channels
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Publisher and Date:(IEEE-Inst Electrical Electronics Engineers Inc, 2018)This paper explores the performance of time-domain synchronous orthogonal frequency-division multiplexing (TDS-OFDM) systems operated under rapidly time-varying mobile channels. Since a rapidly time-varying channel contains more unknown channel coefficients than the number of observations, the mobile channel can conveniently be modeled with the discrete Legendre polynomial basis expansion model to reduce the number of unknowns. The linear minimum mean square error (LMMSE) estimate can be exploited ...
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Nondata-aided joint channel estimation and equalization for OFDM systems in very rapidly varying mobile channels
Authors:
Publisher and Date:(IEEE-INST Electrical Electronics Engineers Inc, 2012)This paper is concerned with the challenging and timely problem of joint channel estimation and equalization for orthogonal frequency division multiplexing (OFDM) systems in the presence of frequency selective and very rapidly time varying channels. The resulting algorithm is based on the space alternating generalized expectation maximization-maximum a posteriori probability (SAGE-MAP) technique which is particularly well suited to multicarrier signal formats. The algorithm is implemented in the ...
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Subspace-Based Estimation of Rapidly Varying Mobile Channels for OFDM Systems
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Publisher and Date:(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2021)It is well-known that time-varying channels can provide time diversity and improve error rate performance compared to time-invariant fading channels. However, exploiting time diversity requires very accurate channel estimates at the receiver. In order to reduce the number of unknown channel coefficients while estimating the time-varying channel, basis expansion models can be used along with long transmission frames that contain multiple orthogonal frequency division multiplexing (OFDM) symbols ...
