Publication

• X. Tian, Ruofei Shen, D. Liu, Y. Wen, and X. Wang, "Performance Analysis of RSS Fingerprinting based Indoor Localization", submitted to IEEE Transactions on Mobile Computing (TMC), 2015.
• G. He, Ruofei Shen, S. Pan, R. Li, Z. Zhang and Q. Lin, "Highly Efficient Integrated Generator of Tripartite Entanglement from χ⁽²⁾ Whispering Gallery Microresonator", submitted to Applied Physics Letters, 2015.
• Ruofei Shen, S. Pan, and G. He, "Highly Efficient Integrated Generator of Tripartite Entanglement from Whispering Gallery Microresonator”, accepted by Nonlinear Optics, 2015.
• G. He, Ruofei Shen, and J. Ruan "Integrated source of path-polarization hyperentanglement using quasi-periodic nonlinear photonic crystal", accepted by Advanced Photonics Conference, 2015.

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Wireless Network & Signal Processing

• Received Signal Strength (RSS) based Indoor Localization

I constructed a multi-dimensional probability space based on the measure theory to model all possible submitted RSS fingerprints by converting localization reliability into the problem of integration over a volume in the multi-dimensional probability space.
Based on the problem formulation, I presented domains of integration in the probability space for the location estimation in one-dimensional and two-dimensional physical indoor space, which were used to model localization in corridors and ordinary rooms, respectively.
Furthermore, to analyze the influence of imperfect databases, I calculated the probability error of location estimation incurred by the imperfect information, with the relationship between the number of sampling in the database building stage and indoor Gaussian noise impacts.

• Multihop TDMA Implementation

To implement TDMA protocol in FreeBSD system, I propose six steps to finish the change:

Disable MAC level ACK

Disable RTS/CTS

Sending custom frame format

Disable transmission back-off

Disable virtual carrier sensing

Disable CCA mechanism

I then analysed the three types of time slot mode in TDMA protocols: control slot, contention slot and data slot and two centralized routing structure: MAC to IP table and Routing table.

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Quantum Entanglement & Optical Frequency Comb

• Pump-Signal-Idler Tripartite Entanglement

I focused on pump-signal-idler tripartite entanglement and designed an experimental generator scheme based on a high-Q Whispering Gallery Microresonator filled with χ⁽²⁾ lithium niobate.
To prove high efficiency of the χ⁽²⁾ nonlinearity compared with traditional χ⁽³⁾ nonlinearity, I analyse the master equation and van Loock-Furusawa criteria.
I theoretically realized the pump-signal-idler tripartite entanglement based on a χ(2) medium with a tentative 0.0136 coupling coefficient, approximately three orders of magnitude greater than traditional methods.

• GLLE Equation Simulation

I propose to use split-step Fourier algorithms solving the GLLE partial differential equations and put Raman terms and high order dispersion terms into consideration. I use the MATLAB to simulate the Four-Wave mixing process occurred in the high-Q Whispering Gallery Microresonator.

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