Earlier Projects

Remote Radio Unit of TD-LTE wireless basestation (Ericsson)

• Conducted Black Box Test (Radio Performance), White Box Test (Trouble shooting), Environmental and Certificate Tests in the development of RRU
• Led a team of 3-5 persons in developing in-house radio automatic test software, trained and supported co-workers in using it for R&D, which brough 10x increase in testing efficiency.
• Publications
  • Zhongyuan Zhao, Weixu Wang, Luping Pan, “PLL and Adaptive Compensation Method in PLL,” International Patent, US9496881 B2, EP3047573 A4, CN105580278A, Issued Date: May. 11, 2016.

Motorola WiMAX (802.16e) Basestation Beamforming System (ArrayComm)

• Developed commercial Multi-Antenna System (beamforming and MU-MIMO)
• Developed MIMO calibration system

NEC PasoWings WiMAX Base-station PHY (ArrayComm)

• Developed commercial physical layer software on many-core DSP + ARM System-On-Chip.
• Implemented uplink equalizer and protocols (channel coding, de-interleaving, Cyclic Redundancy Check).
• Quality of Services (QoS) optimization through task scheduling improvement.

Software Defined Radio Receiver (Master Thesis)

• Designed 20MHz multi-antenna channelized receiver with re-configurable sensitivity, selectivity and bandwidth for signal detection, direct-finding, and parameter estimation.
• Publications
  • Zishu He, Zhongyuan Zhao, Jianzhong Zhang, Ting Chen, and Kexin Jia, “Method and Apparatus for An Implementation of Polyphase Filter Structure,” Patent CN101958697B, Issued Date: Nov. 14, 2012.
  • Zhongyuan Zhao, M.S. (2009). “Design and Implementation of Channelized Digital Receiver based on PCI-Express,” M.S. Thesis. University of Electronic Science and Technology of China: P.R.China

Real-Time High Resolution Image Compression System

• Implementation of a real-time JPEG2000 compressor/decompressor of 20M pixels raw images with a frame rate of 4 fps from CCD sensor.
• Publications
  • Hongping Hu, Zhongyuan Zhao, “A Real-Time High Resolution Image Compression System Based on ADV212,” in Proc. 2nd International Congress on Image and Signal Processing (CISP ‘09), Tianjin, China, pp.1-4, Oct. 2009.

Digital Soft Starter of Asynchronized AC Motor (Bachelor Thesis)

• Designed a voltage and current feedback close-loop digital controller to reduce the mechanical and electrical impacts from high power motor in its starting process.
• Publications
  • Haihong Tang, Zhongyuan Zhao, “DSP and CPLD-based Digital AC Soft Starter,” Automation Information, 2007 (5), pp53-55, May 2007.
  • Zhongyuan Zhao, (2006). “Design of Motor Soft Starter based on DSP and CPLD,” B.S. Thesis. University of Electronic Science and Technology of China: P.R.China

Swept-tuned Spectrum Analyzer, National 1st Prize in 2005 National Undergraduate Electronic Design Contest, (4-day contest)

• National 1st prize (Top 3.8%, 173/4470)
• Designed and implemented an automatic spectrum analysis and modulation identification of analog signal under test for frequency range of 0.1–30MHz.
• A key performance of this spectrum analyzer is that it achieved fine spectral resolution of 200Hz with active crystal narrow band filter. I designed and implemented the analog superheterodyne frontend with dual-channel DDS signal source.
• Worked with 2 teammates, and 1 advisor.