Hyunchul KU

Efficient Digital Compensation Technique for Path Imbalances in LINC Transmitters Using Complex Gain and Linear Model
Hyunchul KU 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/07/01
Vol. E95-C  No. 7  pp. 1222-1225
Type of Manuscript: BRIEF PAPER
Category: 
Keyword: 
error vector magnitude,  LINC,  path imbalance,  digital compensator,  complex gain, 
  Summary |  Full Text:PDF (660.8KB)
An Outphasing Scheme for Reducing Spectral Regrowth of Multi-Tone Signal in LINC Transmitter
Hyunchul KU  Youngcheol PARK 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/02/01
Vol. E95-B  No. 2  pp. 651-654
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
outphasing,  LINC,  path mismatch,  error vector magnitude,  spectral regrowth,  multi-tone, 
  Summary |  Full Text:PDF (650KB)
Architecture and Analysis of Sub-Nyquist Rate Sampling for Behavioral Modeling of Wideband Power Amplifiers
Youngcheol PARK  Hyunchul KU 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/10/01
Vol. E93-C  No. 10  pp. 1544-1547
Type of Manuscript: BRIEF PAPER
Category: Electronic Components
Keyword: 
beharvioral model,  memory effect,  power amplifier,  sampling, 
  Summary |  Full Text:PDF (201.1KB)
Development of Efficient Discrete Model and Error Analysis for Nonlinear RF Power Amplifiers in Wireless Communications
Hyunchul KU  Youngcheol PARK 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/09/01
Vol. E93-B  No. 9  pp. 2363-2369
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
Keyword: 
condition number,  least square,  memory polynomial,  memory effects,  nonlinear,  power amplifier,  sampling,  sensitivity, 
  Summary |  Full Text:PDF (709KB)
Analysis and Identification of Wiener-Hammerstein System in Frequency Domain Using Two-Tone Measurements for Nonlinear RF Transmitters
Hyunchul KU 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/09/01
Vol. E91-A  No. 9  pp. 2435-2441
Type of Manuscript: Special Section PAPER (Special Section on Nonlinear Theory and its Applications)
Category: Analysis, Modelng and Simulation
Keyword: 
memory effects,  nonlinear,  RF power amplifier,  transmitter,  two-tone,  WiBro,  Wiener-Hammerstein, 
  Summary |  Full Text:PDF (658.7KB)
ACPR Improvement Limitations of Predistortion Linearizer for Nonlinear RF Power Amplifiers
Hyunchul KU  Kang-Yoon LEE  Young Beom KIM 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2006/04/01
Vol. E89-C  No. 4  pp. 466-472
Type of Manuscript: Special Section PAPER (Special Section on Advanced RF Technologies for Compact Wireless Equipment and Mobile Phones)
Category: 
Keyword: 
adjacent channel power ratio (ACPR),  nonlinearity,  predistortion (pre-D),  power amplifier (PA),  spectral regrowth,  802.11g, 
  Summary |  Full Text:PDF (649KB)
A Fast Switching Low Phase Noise CMOS Frequency Synthesizer with a New Coarse Tuning Method for PHS Applications
Kang-Yoon LEE  Hyunchul KU  Young Beom KIM 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2006/03/01
Vol. E89-C  No. 3  pp. 420-428
Type of Manuscript: PAPER
Category: Integrated Electronics
Keyword: 
frequency synthesizer,  PHS,  CMOS,  lock-time,  phase noise,  coarse tuning,  current mismatch, 
  Summary |  Full Text:PDF (1.7MB)