February 09, 2017

Two-Dimensional Pilot Design for Non-Orthogonal Multiple Access in Multicarrier System

  • Chen Y.

As being adopted as an important candidate Multiple Access (MA) scheme of future wireless communications, Non-Orthogonal Multiple Access (NOMA) recently attracts more and more attention. In this paper, we propose a solution of two-dimensional superimposed pilot design for NOMA. The proposed scheme exploits Walsh Hadamard matrix and its modifications to create the two-dimensional superimposed pilot, occupying approximately 5% to 10% of total transmit power and covering a certain time-frequency allocation. Deploying coherent processing in a moving average manner, adequate performance as initial channel estimates can be achieved even under asynchronous communications. Then, the two-dimensional superimposed pilots are dual-purposely exploited by the trellis-based detector, by jointly further improving the channel estimation and multiuser detection in NOMA system. Throughout our investigation, we demonstrate that the proposed pilot scheme can support not only big data block, but also relatively small data block.

View Original Article

Recent Publications

August 09, 2017

A Cloud Native Approach to 5G Network Slicing

  • Francini A.
  • Miller R.
  • Sharma S.

5G networks will have to support a set of very diverse and often extreme requirements. Network slicing offers an effective way to unlock the full potential of 5G networks and meet those requirements on a shared network infrastructure. This paper presents a cloud native approach to network slicing. The cloud ...

August 01, 2017

Modeling and simulation of RSOA with a dual-electrode configuration

  • De Valicourt G.
  • Liu Z.
  • Violas M.
  • Wang H.
  • Wu Q.

Based on the physical model of a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in radio over fiber (RoF) links, the distributions of carrier density, signal photon density, and amplified spontaneous emission photon density are demonstrated. One of limits in the use of RSOA is the lower ...

July 12, 2017

PrivApprox: Privacy-Preserving Stream Analytics

  • Chen R.
  • Christof Fetzer
  • Le D.
  • Martin Beck
  • Pramod Bhatotia
  • Thorsten Strufe

How to preserve users' privacy while supporting high-utility analytics for low-latency stream processing? To answer this question: we describe the design, implementation and evaluation of PRIVAPPROX, a data analytics system for privacy-preserving stream processing. PRIVAPPROX provides three properties: (i) Privacy: zero-knowledge privacy (ezk) guarantees for users, a privacy bound tighter ...