Research



WiFiUS: Millimeter Wave-based Wearable Networks in High-End IoT Applications (NSF project)
- Graduate Research Assistant | Supervisor: Prof. Nuria González-Prelcic and Prof. Robert W. Heath, Jr
- WNCG, UT Austin, 08/2017-present
  • Designed dictionary learning aided compressive channel estimation algorithms for Hybrid Frequency-Selective mmWave MIMO Systems
  • Incorporated the proposed dictionary learning algorithms into IEEE 802.11ad/ay protocols 

Dictionary Learning for mmWave V2X
  • Derived a general MIMO channel modeling for the large-scale antenna array regimes and/or wideband system under beam squint, showing the limitations of existing MIMO models
  • Designed dictionary learning aided channel estimation algorithms for mmWave V2X systems under beam squint  

Channel tracking for mmWave V2X under blockage
  • Implemented 5G NR channel model with blockage using QuaDRiGa and evaluated the 5G NR beam management under blockage
  • Designed two wideband channel tracking algorithms and schemes for mmWave V2X under blockage

Basic Theories and Methods for Stereoscopic Coverage Wireless Communications
- Graduate Research Assistant | Supervisor: Prof. Feifei Gao
- Tsinghua University, 09/2014-07/2017
  • Proposed full-space coverage strategy for massive MIMO cognitive radio systems based on dual base station cooperation and large-scale antenna arrays
  • Devised low-complexity algorithms for user scheduling in above strategy based on DFT-aided efficient angle acquisition and array signal processing techniques
 
 
     Fig. 1 Full-space coverage with two cognitive             radio base stations (CBS).                   Fig. 2 Topology of dual CBS employment.
 

Estimation and Detection in Wireless Communications
- Graduate Research Assistant | Supervisor: Prof. Feifei Gao
- Tsinghua University, 09/2014-07/2017
  • Designed low-rank channel representation and unified channel estimation scheme for TDD/FDD massive MIMO systems by incorporating antenna array theory
  • Proposed DFT and angle reciprocity aided massive MIMO time-varying channel tracking scheme



 
  Fig. 1 Spatial channel expansion model using 
  orthogonal steering vectors as basis vectors

   Fig. 2 Illustration of spatial rotation. After spatial rotation, the number of DFT points gathering 99% channel power is significantly reduced.


OFDM Channel Resource Allocation for High-Speed Train Communications
- National Mobile Communications Research Laboratory 
- Undergraduate Research assistant | Supervisor: Prof. Wei Xu
- Southeast University, 10/2012-12/2013
  • Designed low-complexity OFDM resource allocation scheme for high-speed mobile environment
  • Conducted performance evaluation of proposed scheme based on Matlab programming

Pattern Recognition for Real-time Robot Environment Modeling 
- National College Students Innovation Training Project, Southeast University
Undergraduate Research assistant | Supervisor: Prof. Renjie Hu
- Southeast University, 04/2012-12/2013
  • Put forward algorithm for environment geometrical modeling by comparing signal difference of adjacent ultrasonic sensors
  • Designed hardware prototype with FPGA and microcontroller to instruct robot motion