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Learning Tracking Over Unknown Fading Channels Based on Iterative Estimation
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DOI：10.1109/TNNLS.2020.3027475.png)
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With fast developments in communication technologies, a large number of practical systems adopt the networked control structure. For this structure, the fading problem is an emerging issue among other network problems. It has not been extensively investigated how to guarantee superior control performance in the presence of unknown fading channels. This article presents a learning strategy for gradually improving the tracking performance. To this end, an iterative estimation mechanism is first introduced to provide necessary statistical information such that the biased signals after transmission can be corrected before being utilized. Then, learning control algorithms incorporating with a decreasing step-size sequence are designed for both output and input fading cases. The convergence in both mean-square and almost-sure senses of the proposed schemes is strictly proved under mild conditions. Illustrative simulations verify the effectiveness of the entire learning framework.
Keyword:
Fading channels
Estimation
Convergence
Indexes
Learning systems
Stochastic processes
Resource management
Fading channels
iterative estimation
learning control
multiplicative randomness
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