National Sun Yat-sen University, Kaohsiung, Taiwan 804, R.O.C Email: chaokai.wen@mail Please append ".nsysu.edu.tw" to the end of the email.

Hello, there! I am the Professor of the Institute of Communications Engineering at National Sun Yat-sen University (NSYSU). I received my Ph.D. from the Institute of Communications Engineering, National Tsing Hua University, Taiwan, in 2004. After receiving my Ph.D. degree, I spent five years in industry (Industrial Technology Research Institute, Taiwan and MediaTek Inc., Taiwan) and then joined NSYSU in 2009. In the five years of industry, I focused on broadband digital transceiver design.

My research style is interdisciplinary and usually combines communication technology, signal processing, data analysis, and prototyping. I am very interested in realizing the research results on communication prototypes and test platforms, and most of the technology has been transferred to the industry. I have won several awards for Industry-University Cooperation from NSYSU. My papers were selected as the best paper awards by IEEE GLOBECOM 2016, WCSP 2019, and IEEE ICC 2022.

I am Editor for the IEEE Transactions on Wireless Communications, IEEE Communications Letters, and IEEE Wireless Communications Letters. I received the 2018 IEEE COMML Editor Award and 2020 IEEE WCL Best Editor Award. My current research interests center around:

News

8 December, 2020

mmWave Fast Antenna and Beam Switching OTA Demo at GLOBECOM 2020

  • mmWave smartphone with two subarrays at the 28 GHz

  • 5G NR Frame Structure with beam management (Rel-15)

  • 100 MHz channel width

  • Modulations from QPSK to 256-QAM

  • Fast antenna and beam switching (Fast-ABS) mechanism: Using the information of a single receiving array module to predict the receiving performance of other array modules. When the receiving module is blocked, Fast-ABS can quickly perform module and beam switching.

2 September, 2020

12x12 MIMO-OFDM OTA Demo at Taipei Nangang Exhibition Center for MOST B5G/6G Wireless Network Research Project

  • 12x12 MIMO-OFDM based on 5G NR frame structure (Rel. 15)

  • 12- Rx antennas in a compact smartphone for the 3.5 GHz

  • 12-Tx spatial streams over 2 distributed BSs

  • 100 MHz channel width

  • 64-QAM

  • Achieving 42.9 bps/Hz spectral efficiency on a 5.5 inch screens compact smartphone by using

1) Precoding over two distributed BSs,

2) Smart channel estimator with environment sensing,

3) AI-aided MIMO detector,

4) Joint MIMO detector and LDPC decoder (JDD)

14-17 January, 2020

mmWave Fast Antenna and Beam Switching OTA Demo at 2020 Taiwan Telecommunications Annual Symposium

  • mmWave smartphone with two subarrays for the 28 GHz

  • NR Frame Structure (Release 15)

  • 100 MHz channel width

  • From QPSK to 256-QAM

  • Fast antenna and beam switching (Fast-ABS) mechanism

  • Efficient and seamless connectivity under hand blockage

24-26 January, 2019

mmWave Beam Tracking OTA Demo at 2019 Taiwan Telecommunications Annual Meeting

  • mmWave antenna system in a smartphone for the 28 GHz

  • NR Frame Structure (Release 15)

  • 100 MHz channel width

  • 256-QAM and 1204-QAM

  • Fast beam tracking mechanism

  • Support various performance measurement (e.g., EVM, SNR, throughput, beam pattern )

3 August, 2018

20x16 (or 16x16) MIMO OTA Demo

  • 20 (or 16)-antenna array in the compact smartphone for the 3.5 GHz

  • 16 spatial streams

  • 100 MHz channel width

  • 256-QAM for 20-antennas (or 64QAM for 16-antennas)

  • 62.4 bps/Hz (or 49.7 bps/Hz) spectral efficiency on a compact smartphone with 5.5 inch screens

12 December, 2017

20x14 MIMO OTA Demo at 2017 Industry Outlook Technology Forum

  • 20-antenna array in the compact smartphone for the 3.5 GHz

  • 14 spatial streams

  • 100 MHz channel width

  • 256-QAM

  • 59.5 bps/Hz spectral efficiency on a compact smartphone with 5.5 inch screens

16x12 MIMO

11 August, 2017

16x12 MIMO OTA Demo at 2017 IAET Summer Seminar

  • 16-antenna array in the compact smartphone for the 3.5 GHz

  • 12 spatial streams

  • 100 MHz channel width

  • 256-QAM

  • 53.41 bps/Hz spectral efficiency