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Blind signal extraction is particularly attractive to solve signal mixture problems while only one or a few source signals are desired. Many desired biomedical signals exhibit distinct periods. A sequential method based on second order statistics is introduced in this paper. One can choose to recover one source signal or all signals in a specific order. The validity and performance of the proposed...
This paper proposes a method using SDG (Signed Directed Graph) to investigate fault propagation mechanism of IGBT faults in traction system of CRH (China Railway High-speed) trains. A TCG (Time Causal Graph) model is obtained from the BG (Bond Graph) model of CRH5 traction system first; then, an SDG model is derived from the TCG model in accordance with fault tree propagation backward derivation....
In this paper, we investigate the optimal pilot for multiple-input multiple-output and orthogonal frequency-division multiplexing (MIMO-OFDM) systems. The optimal pilot is obtained by minimizing the mean-square-error (MSE) of the linear minimum MSE (LMMSE) channel estimation, which is related to the channel correlation matrices in space, time, and frequency domains. We obtain that the optimal pilot...
This paper investigates the downlink transmission for cooperative cellular networks with multi-base stations and single mobile station using statistical channel state information at the base stations. We consider a general jointly correlated MIMO channel model. We first propose an optimal transmission scheme to maximize the ergodic sum capacity, which reveals the transmit signals of all base stations...
This paper researches the capacity of multiple-input multiple-output (MIMO) channels jointly-correlated spatially on both sides in the low signal-to-noise (SNR) regime. We shall derive two key low SNR metrics: the minimum required Eb/N0 and the wideband slope, assuming two types of channel state information (CSI) at the transmitter. We obtain closed-from solutions of these low SNR parameters for Gaussian...
In this paper, we address the preamble-based channel estimation problem for orthogonal frequency-division multiplexing (OFDM) systems using multiple amplify-and-forward (AF) relays. We first establish a linear minimum mean-square-error (LMMSE) channel estimator which directly estimates the overall channels from the source to the destination. Then, based on the assumption that the channel correlations...
In this paper, a capacity bound for jointly correlated MIMO channel is investigated assuming full knowledge of the channel state information (CSI) at the receiver and statistical CSI at the transmitter. An eigenmode transmission strategy using statistical transmitter CSI is presented, and a closed-form capacity bound for eigenmode-based systems is derived. A relationship between the capacity upper...
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