Ting-Chen Chen

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Internet of Things (IoT) have gained much attention recently. However, the transmission behavior of nodes in such a cloud-assisted IoT environment is not well studied. In this work, we mainly address the problem of node connectivity analysis based on percolation theory. First, we investigate when it is possible for two nodes to communicate with each other.(More)
In this paper, we investigate the tracking of time-varying channels in OFDM systems using both preamble and pilot symbols. A regularized least-squares method will be used to incorporate the initial channel estimate from the preamble to improve the performance of pilot-assisted channel estimation. Instead of using a fixed regularization parameter, the(More)
This paper introduces algorithms to find relay ordering in a multi-hop cooperative diversity network. We first describe an optimal relay ordering algorithm for this multi-branch multi-hop cooperative diversity network. The optimum algorithm has a very high complexity that makes it hard to implement when being used in an environment with a large number of(More)
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