June 05, 2016

Online Algorithm for Approximate Quantile Queries on Sliding Windows

  • Chen R.
  • Crouch M.
  • Sala A.
  • Yu C.

We address the problem of estimating statistical information about the most recent parts of a stream of incoming data. In particular, we provide an improved algorithm for estimating approximate quantiles in the ``sliding window'' model of streams. We extend the GK algorithm by replacing its numeric counters with a sliding-window sketch based on the exponential histograms (EH) technique. By analyzing the GK algorithm and using a sliding window sketch which performs only the necessary operations, we achieve improved runtime performance on real-world data sets compared to previous sliding window algorithms for quantile estimation.

View Original Article

Recent Publications

January 01, 2018

Fair Dynamic Spectrum Management for QRD-Based Precoding with User Encoding Ordering in Downstream G.fast Transmission

In next generation DSL networks such as G.fast, employing discrete multi-tone transmission in high frequencies up to 212 MHz, the crosstalk among lines reaches very high levels. To precompensate the crosstalk in downstream transmission, QRD-based precoding has been proposed as a near-optimal dynamic spectrum management (DSM) technique. However, the performance ...

January 01, 2018

Practical Mitigation of Passive Intermodulation in Microstrip Circuits

This paper presents new experimental evidence and a novel practical approach for mitigation of passive intermodulation (PIM) in microstrip circuits fabricated on commercial printed circuit board laminates. The mechanisms of distributed PIM in microstrip circuits are reviewed and a phenomenology of PIM generation due to locally enhanced electromagnetic fields at ...

January 01, 2018

Efficient Cooperative HARQ for Multi-Source Multi-Relay Wireless Networks

In this paper, we compare the performance of three different cooperative Hybrid Automatic Repeat reQuest (HARQ) protocols for slow-fading half-duplex orthogonal multiple access multiple relay channel. Channel State Information (CSI) is available at the receiving side of each link only. Time Division Multiplexing is assumed, where each orthogonal transmission occurs ...