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A robust and reduced-complexity H-infinity (H-inf) channel estimator for multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems is addressed. The proposed estimator is realized by taking the following procedures: first, a simplified objective function is considered to guarantee the design simplicity of the H-inf channel estimator. Second, an expectation maximization...
In this paper, an H-infinity channel estimator, adopting simplified objective function, is introduced to multiple-input multiple-output with orthogonal frequency division multiplexing (MIMO-OFDM) systems. Next, the matrices inversions and multiplications are reduced by using the expectation maximum (EM) algorithm. Finally, the performance degradation due to the carrier frequency offset (CFO)) is improved...
One of the most ubiquitous feature of biological systems is that they generally output signals with long-range correlations. As Boolean networks has been successfully used to model a number of biomolecular systems. In this paper, we studied the long-range correlation behaviors of this model. Our results show that Boolean networks can undergo a regular transfer from Brownian noise to 1/ f process,...
Ant colony optimization (ACO) is an optimization technique that was inspired by the foraging behavior of real ant colonies. As a new exploring attempt to the structural health monitoring (SHM), the ACO algorithm is applied to the continuous optimization problems on the structural damage detection in the SHM field in this paper. First of all, the theoretical background on the ACO is introduced for...
This paper presents an expectation-maximization (EM) based angle-domain algorithm (EMA) channel estimation for multiple-input multiple-output with orthogonal frequency division multiplexing (MIMO-OFDM) systems. Although EM algorithm combined with maximum a posteriori (MAP) estimator could obtain good performance, its high complexity makes this algorithm unpractical. The proposed algorithm do not require...
Multiple-input multiple-output combined with orthogonal frequency division multiplexing (MIMO-OFDM) channel estimation could be improved by prior knowledge of the channel spatial correlation. This information is, however, not always unavailable. So, we choose to investigate channel estimation in angle domain, where different channel coefficients can be assumed to be of irrelevance. In this paper,...
As feature sizes of integrated circuits continue to shrink and demand for low power operation continues to increase, power supply voltages may eventually be reduced to the level where noise becomes significant compared with signals. This would cause digital logic circuits to exhibit non-deterministic behavior. In this paper, we study the stochastic behavior of simple digital circuits operating at...
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