Ryota Yoshizawa


Short Bio.

Ryota Yoshizawa was born in Tochigi, JAPAN, in 1988. He received the B.E., M.E., and Ph.D. degrees in wireless communications from the Yokohama National University (YNU), Yokohama, Kanagawa, JAPAN, in 2011, 2013, and 2016, respectively. From 2013 to 2016, he was a Research Fellow (DC1) of the Japan Society for the Promotion of Science (JSPS). Since 2016 to present, he has been with the Institute of Memory Technology R&D at Kioxia Corporation (formely known as Toshiba Memory), where he had engaged in the development of error correction codes (ECC) for NAND flash memory controllers from 2016 to 2018, and since 2018, he has developed the AI technologies applicable for efficient mass-production and performance-enhancement of NAND flash memory devices. His research interests include Bayesian optimization, data mining technologies, and fundamental statistical methodologies related to machine learning.

Journal Papers

  1. R. Yoshizawa and H. Ochiai, "Trellis-Assisted Constellation Subset Selection for PAPR Reduction of OFDM Signals," IEEE Transactions on Vehicular Technology, vol.66, no.3, pp.2183--2198, September 2017.
  2. R. Yoshizawa and H. Ochiai, "Energy Efficiency Improvement of Coded OFDM Systems Based on PAPR Reduction," IEEE Systems Journal, vol.11, no.2, pp.717--728, June 2017.
  3. M. Mastuoka, R. Yoshizawa and H. Ochiai, "Peak and Average Power Reduction of OFDM Signals Based on Trellis Shaping with Controllable Region Expansion," Wireless Personal Communications, vol.93, no.3, pp.737--754, April 2017.
  4. R. Yoshizawa and H. Ochiai, "A Trellis Shaping for Peak and Average Power Reduction of BICM-OFDM Signals," IEEE Transactions on Wireless Communications, vol.11, no.2, pp.717--728, June 2015.
  5. R. Yoshizawa and H. Ochiai, "Performance Comparison of Uncoded OFDM Systems with Trellis Shaping over Nonlinear Channels," Wireless Personal Communications, vol.72, no.3, pp.1603--1617, October 2013.

Conference Papers

  1. R. Yoshizawa and H. Ochiai, "Mutual Information and Coded BER Analysis of PAPR Reduced OFDM System with Active Constellation Extension," in Proc. IEEE Global Communications Conference (GLOBECOM'15), San Diego, CA, December 2015.
  2. R. Yoshizawa and H. Ochiai, "Effect of Clipping and Filtering with Distortionless PAPR Reduction for OFDM Systems," in Proc. IEEE 82nd Vehicular Technology Conference (VTC'15-Fall), Boston, MA, September 2015.
  3. R. Yoshizawa and H. Ochiai, "Theoretical Error Rate Analysis of Trellis Shaped M-QAM Constellations," in Proc. IEEE Wireless Communications and Networking Conference (WCNC'15), New Orleans, LA, Narch 2015.
  4. R. Yoshizawa and H. Ochiai, "A Novel Trellis-Based PAPR Reduction Technique for OFDM Signals," in Proc. IEEE International Symposium on Information Theory (ISIT'14), Honolulu, HI, June 2014.
  5. R. Yoshizawa and H. Ochiai, "Balancing PAPR and Error Performance of OFDM Signals Using Trellis-Based Constellation Selection," presented in IEEE Communications Theory Workshop (CTW'14), Curaao, Nederland, May 2014.
  6. R. Yoshizawa and H. Ochiai, "Analysis and Optimization of Trellis Shaping Concatenated with Bit-Interleaved Coded Modulation," in Proc. IEEE 78th Vehicular Technology Conference (VTC'13-Fall), Las Vegas, NV, September 2013.
  7. M. Matsuoka, R. Yoshizawa and H. Ochiai, "Improvement of Peak and Average Power Reduction of Trellis Shaped OFDM Signals by Controllable Region Expansion," in Proc. 16th International Symposium on Wireless Personal Multimedia Communications (WPMC'13), Atlantic City, NJ, June 2013.
  8. R. Yoshizawa and H. Ochiai, "A Serial Concatenation of Coding and Trellis Shaping for OFDM Systems with Peak Power Reduction," in Proc. International Symposium on Information Theory (ISIT'12), MIT, MA, July 2012.
  9. R. Yoshizawa and H. Ochiai, "Performance Comparison of Trellis-Shaped OFDM Systems over Nonlinear Channels," in Proc. 14th International Symposium on Wireless Personal Multimedia Communications (WPMC'11), Brest, France, October 2011.
  10. R. Yoshizawa and H. Ochiai, "Peak Power Reduction of OFDM Signals Using Trellis Shaping with M-algorithm," in Proc. IEEE 20th International Conference on Computer Communications and Networks (ICCCN'11), Maui, HI, August 2011.