Weiping Zhu

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Nowadays, cognitive radio technique has been acknowledged as a smart and potential method to improve the spectrum utilization. In this work, we investigate a cognitive radio communication scheme, where a number of cognitive users, each with multiple antennas, can share the spectrum with the primary user. To decrease the inter-user interference, zero-forcing(More)
  • Weiping Zhu
  • 2009 International Conference on New Trends in…
  • 2009
Delay tomography and loss tomography are two key components of network tomography, the former is for estimating link level delay distribution of a network, while the latter for estimating link-level loss rates of a network, by end-to-end measurement. The difference between the objectives leads to two independent studies and creates two types of methods for(More)
  • Weiping Zhu
  • Fifth International Conference on Algorithms and…
  • 2002
Network tomography aims to obtain link-level performance characteristics, such as loss ratio and average delay on each link, by end-to-end measurement. We proposed an approach in the multicast class that uses a Bayesian network to carry out statistical inference. Studies show that our approach can achieve the same results as other methods with strong(More)
  • Weiping Zhu
  • 2012 Third International Conference on Networking…
  • 2012
Delay tomography is one of the key components of network tomography that has been studied for a number of years. In this paper, an EM-like algorithm is proposed for the delay tomography of the tree topology that uses a dynamic-programming strategy to perform n-fold deconvolution. The effectiveness of the algorithm has been confirmed by simulation.
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