Kyungwhoon Cheun - IEEE Xplore Author Profile
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Kyungwhoon Cheun

Also published under: K. Cheun

Publications
44
Citations
2,825
Publications by Year
19882018
Co-Authors:
Show All Co-Authors (39)
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Kyungwhoon Cheun

Also published under: K. Cheun

Affiliation

Samsung Electronics

Publication Topics

Biography

Kyungwhoon Cheun (kw.cheun@samsung.com) received his B.S. in electronics engineering from Seoul National University in 1985. He earned his M.S. and Ph.D. degrees from the University of Michigan, Ann Arbor in 1987 and 1989, respectively. He was an assistant professor at the University of Delaware from 1989 to 1991 and joined the Pohang University of Science and Technology (POSTECH) in 1991, where he is currently a full professor. Aside from his academic duties, he served as the CTO for Pulsus Technologies Inc. during 2004 to 2011, a Qualcomm partner company. Since 2012, he has been with Samsung Electronics where he is currently corporate President and CTO/Head of Samsung Research.
Publications
44
Citations
2,825
Publications by Year
19882018
Co-Authors:
Show All Co-Authors (39)
Author's Published Works

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A Message-Passing Algorithm for Counting Short Cycles in Nonbinary LDPC Codes

Sunghye Cho;Kyungwhoon Cheun;Kyeongcheol Yang

2018 IEEE International Symposium on Information Theory (ISIT)
Year: 2018 | Conference Paper |
Cited by: Papers (4)
Trapping sets with short cycles are known to give a detrimental effect on the error floor performance of a low-density parity-check (LDPC) code. Unlike in binary LDPC codes., short cycles in a nonbinary low-density parity-check (NB-LDPC) code may be even more harmful to its performance if they do not satisfy the so-called full rank condition (FRC). This is because they may induce low-weight codewo...Show More

A Message-Passing Algorithm for Counting Short Cycles in Nonbinary LDPC Codes

Sunghye Cho;Kyungwhoon Cheun;Kyeongcheol Yang

Year: 2018 | Conference Paper |

Design of Nonbinary LDPC Codes Based on Message-Passing Algorithms

Sunghye Cho;Kyungwhoon Cheun;Kyeongcheol Yang

IEEE Transactions on Communications
Year: 2018 | Volume: 66, Issue: 11 | Journal Article |
Cited by: Papers (2)
Short cycles in a nonbinary low-density parity-check (NB-LDPC) code may be even more harmful to its performance if they do not satisfy the so-called full rank condition (FRC). This is because they may induce low-weight codewords or absorbing sets in that case. Thus, it is important to count the number of short cycles not satisfying the FRC as well as the number of short cycles for analyzing the pe...Show More

Design of Nonbinary LDPC Codes Based on Message-Passing Algorithms

Sunghye Cho;Kyungwhoon Cheun;Kyeongcheol Yang

Year: 2018 | Volume: 66, Issue: 11 | Journal Article |

Low-Complexity Decoding of Block Turbo Codes Based on the Chase Algorithm

Jaeyong Son;Kyungwhoon Cheun;Kyeongcheol Yang

IEEE Communications Letters
Year: 2017 | Volume: 21, Issue: 4 | Journal Article |
Cited by: Papers (10)
Block turbo codes (BTCs) are constructed by serially concatenating linear block codes and iteratively decoded by letting each component code be decoded in two stages. The Chase algorithm is employed in the first stage to make a list of candidate codewords by generating a fixed number of test sequences (TSs) and algebraically decoding them, regardless of the signal-to-noise ratio or the iteration n...Show More

Low-Complexity Decoding of Block Turbo Codes Based on the Chase Algorithm

Jaeyong Son;Kyungwhoon Cheun;Kyeongcheol Yang

Year: 2017 | Volume: 21, Issue: 4 | Journal Article |

Feasibility of Mobile Cellular Communications at Millimeter Wave Frequency

Yungsoo Kim;Hyun-Yong Lee;Philyeong Hwang;Ranjeet Kumar Patro;Jaekon Lee;Wonil Roh;Kyungwhoon Cheun

IEEE Journal of Selected Topics in Signal Processing
Year: 2016 | Volume: 10, Issue: 3 | Journal Article |
Cited by: Papers (100)
High data rate at high mobile speed will still be an essential requirement for the future 5G mobile cellular system. High frequency bands above 6 GHz are particularly promising for the 5G system because of large signal bandwidths such high frequencies can offer. By using high gain beamforming antennas, the problem of high propagation loss at high frequencies can be overcome. However, the use of be...Show More

Feasibility of Mobile Cellular Communications at Millimeter Wave Frequency

Yungsoo Kim;Hyun-Yong Lee;Philyeong Hwang;Ranjeet Kumar Patro;Jaekon Lee;Wonil Roh;Kyungwhoon Cheun

Year: 2016 | Volume: 10, Issue: 3 | Journal Article |

Feasibility of Mobile Cellular Communications at Millimeter Wave Frequency

Yungsoo Kim;Hyun-Yong Lee;Jongho Oh;Jaekon Lee;Wonil Roh;Kyungwhoon Cheun

2015 IEEE Global Communications Conference (GLOBECOM)
Year: 2015 | Conference Paper |
Cited by: Papers (4)
High data rate at high mobile speed will still be an essential requirement for the future 5G mobile cellular system. High frequency bands above 6 GHz are particularly promising for the 5G system because of large signal bandwidths such high frequencies can offer. And it was shown that by using high gain beamforming antennas, the problem of high propagation loss at high frequencies could be compensa...Show More

Feasibility of Mobile Cellular Communications at Millimeter Wave Frequency

Yungsoo Kim;Hyun-Yong Lee;Jongho Oh;Jaekon Lee;Wonil Roh;Kyungwhoon Cheun

Year: 2015 | Conference Paper |

Holistic design considerations for environmentally adaptive 60 GHz beamforming technology

Ohyun Jo;Wonbin Hong;Sung Tae Choi;Sanghyun Chang;Changyeul Kweon;Jisung Oh;Kyungwhoon Cheun

IEEE Communications Magazine
Year: 2014 | Volume: 52, Issue: 11 | Magazine Article |
Proliferation of all forms of smart devices has driven the demand for high-data-rate Wi-Fi in recent years. Utilizing wide bandwidth in high frequency is the most efficient way of guaranteeing the explosive data demands. In spite of the notable advancements of RF technologies at millimeter wave, the relatively high propagation loss remains problematic. The authors present efficient beamforming tec...Show More

Holistic design considerations for environmentally adaptive 60 GHz beamforming technology

Ohyun Jo;Wonbin Hong;Sung Tae Choi;Sanghyun Chang;Changyeul Kweon;Jisung Oh;Kyungwhoon Cheun

Year: 2014 | Volume: 52, Issue: 11 | Magazine Article |

A modulation technique for active interference design under downlink cellular OFDMA networks

Sungnam Hong;Min Sagong;Chiwoo Lim;Kyungwhoon Cheun;Sunghye Cho;Young Min Choi

2014 IEEE Wireless Communications and Networking Conference (WCNC)
Year: 2014 | Conference Paper |
Cited by: Papers (1) | Patents (3)
In cellular systems, the interference has been the most critical issue that practically limits the performance of overall networks. Furthermore, the distribution of the inter-cell interference (ICI) in conventional cellular networks employing orthogonal frequency-division multiple-access (OFDMA) with quadrature amplitude modulation (QAM) tends to approach a Gaussian distribution, which is known to...Show More

A modulation technique for active interference design under downlink cellular OFDMA networks

Sungnam Hong;Min Sagong;Chiwoo Lim;Kyungwhoon Cheun;Sunghye Cho;Young Min Choi

Year: 2014 | Conference Paper |

Mobile's millimeter-wave makeover

Theodore S. Rappaport;Wonil Roh;Kyungwhoon Cheun

IEEE Spectrum
Year: 2014 | Volume: 51, Issue: 9 | Magazine Article |
People in real estate joke that there are only three things that matter in the business of buying and selling property: location, location, location. The same could be said for radio spectrum. The frequencies used for cellular communications have acquired the status of waterfront lots-highly coveted and woefully scarce. And like beach-home buyers in a bidding war, mobile operators must constantly ...Show More

Mobile's millimeter-wave makeover

Theodore S. Rappaport;Wonil Roh;Kyungwhoon Cheun

Year: 2014 | Volume: 51, Issue: 9 | Magazine Article |

Frequency and Quadrature-Amplitude Modulation for Downlink Cellular OFDMA Networks

Sungnam Hong;Min Sagong;Chiwoo Lim;Sunghye Cho;Kyungwhoon Cheun;Kyeongcheol Yang

IEEE Journal on Selected Areas in Communications
Year: 2014 | Volume: 32, Issue: 6 | Journal Article |
Cited by: Papers (36)
The distribution of the intercell interference (ICI) in conventional cellular networks employing orthogonal frequency-division multiple-access (OFDMA) with quadrature-amplitude modulation (QAM) tends to approach a Gaussian distribution when all available subcarriers in each cell are fully loaded. Recently, it has been also shown that the worst-case distribution of the ICI as additive noise in wire...Show More

Frequency and Quadrature-Amplitude Modulation for Downlink Cellular OFDMA Networks

Sungnam Hong;Min Sagong;Chiwoo Lim;Sunghye Cho;Kyungwhoon Cheun;Kyeongcheol Yang

Year: 2014 | Volume: 32, Issue: 6 | Journal Article |

Millimeter-wave beamforming as an enabling technology for 5G cellular communications: theoretical feasibility and prototype results

Wonil Roh;Ji-Yun Seol;Jeongho Park;Byunghwan Lee;Jaekon Lee;Yungsoo Kim;Jaeweon Cho;Kyungwhoon Cheun;Farshid Aryanfar

IEEE Communications Magazine
Year: 2014 | Volume: 52, Issue: 2 | Magazine Article |
The ever growing traffic explosion in mobile communications has recently drawn increased attention to the large amount of underutilized spectrum in the millimeter-wave frequency bands as a potentially viable solution for achieving tens to hundreds of times more capacity compared to current 4G cellular networks. Historically, mmWave bands were ruled out for cellular usage mainly due to concerns reg...Show More

Millimeter-wave beamforming as an enabling technology for 5G cellular communications: theoretical feasibility and prototype results

Wonil Roh;Ji-Yun Seol;Jeongho Park;Byunghwan Lee;Jaekon Lee;Yungsoo Kim;Jaeweon Cho;Kyungwhoon Cheun;Farshid Aryanfar

Year: 2014 | Volume: 52, Issue: 2 | Magazine Article |

FQAM : A modulation scheme for beyond 4G cellular wireless communication systems

Sungnam Hong;Min Sagong;Chiwoo Lim;Kyungwhoon Cheun;Sunghye Cho

2013 IEEE Globecom Workshops (GC Wkshps)
Year: 2013 | Conference Paper |
We analyze the performance of bit interleaved coded modulation (BICM) and coded modulation (CM) systems with frequency and quadrature amplitude modulation (FQAM), which is a combination of frequency shift keying (FSK) and quadrature amplitude modulation (QAM). Numerical results show that for modest code rates in low signal-to-noise ratio regions, the normalized throughputs of FQAM based CM systems...Show More

FQAM : A modulation scheme for beyond 4G cellular wireless communication systems

Sungnam Hong;Min Sagong;Chiwoo Lim;Kyungwhoon Cheun;Sunghye Cho

Year: 2013 | Conference Paper |

Performance of M-ary turbo coded synchronous FHSS multiple access networks with noncoherent MFSK under Rayleigh fading channels

Sungnam Hong;Kyungwhoon Cheun;Hyuntack Lim;Sunghye Cho

Journal of Communications and Networks
Year: 2013 | Volume: 15, Issue: 6 | Journal Article |
Cited by: Papers (1)
The performance of M-ary turbo coded synchronous, fast frequency-hopping spread spectrum multiple-access (FHSS-MA) networks with M-ary frequency shift keying (MFSK) and noncoherent detection is analyzed under Rayleigh fading. Results indicate that M-ary turbo codes dramatically enhance the performance of FHSS-MA networks using MFSK compared to binary turbo codes.Show More

Performance of M-ary turbo coded synchronous FHSS multiple access networks with noncoherent MFSK under Rayleigh fading channels

Sungnam Hong;Kyungwhoon Cheun;Hyuntack Lim;Sunghye Cho

Year: 2013 | Volume: 15, Issue: 6 | Journal Article |

Noncoherent unitary space-time modulated DSSS systems in multipath channels

Kyungwhoon Cheun;Jeongchang Kim;Youhan Kim;Soongyoon Choi

Journal of Communications and Networks
Year: 2012 | Volume: 14, Issue: 2 | Journal Article |
Cited by: Papers (1)
In this paper, in order to effectively apply unitary space-time modulation to the direct-sequence spread-spectrum multiple-access (DSSS-MA) networks, we propose a low-rate, noncoherent, unitary, and space-time modulated DSSS system supporting any number of transmit antennas based on Walsh matrices. The proposed scheme simultaneously performs bandwidth spreading and space-time coding and outperform...Show More

Noncoherent unitary space-time modulated DSSS systems in multipath channels

Kyungwhoon Cheun;Jeongchang Kim;Youhan Kim;Soongyoon Choi

Year: 2012 | Volume: 14, Issue: 2 | Journal Article |

An efficient sliding window algorithm using adaptive-length guard window for turbo decoders

Hyuntack Lim;Yongsang Kim;Kyungwhoon Cheun

Journal of Communications and Networks
Year: 2012 | Volume: 14, Issue: 2 | Journal Article |
Cited by: Papers (8)
An efficient sliding window algorithm employing an adaptive-length guard window for turbo decoders is proposed. The proposed algorithm results in significant complexity reductions, especially for small sliding window lengths where the additional computational complexity required for the guard window is critical.Show More

An efficient sliding window algorithm using adaptive-length guard window for turbo decoders

Hyuntack Lim;Yongsang Kim;Kyungwhoon Cheun

Year: 2012 | Volume: 14, Issue: 2 | Journal Article |

A Systematic Granulized Piecewise Linear Approximation to the Jacobian Logarithm

Min Sagong;Kyungwhoon Cheun

IEEE Transactions on Communications
Year: 2012 | Volume: 60, Issue: 9 | Journal Article |
Cited by: Papers (2)
A systematic, granulized piecewise linear approximation to the Jacobian logarithm is developed. This approximation reverts to the Jacobian approximation and the exact Jacobian logarithm at the far extremes. The utility of the derived approximation is demonstrated by applying it to the decoding of Turbo coded, MIMO/BICM-ID systems.Show More

A Systematic Granulized Piecewise Linear Approximation to the Jacobian Logarithm

Min Sagong;Kyungwhoon Cheun

Year: 2012 | Volume: 60, Issue: 9 | Journal Article |

A Statistical Inter-Cell Interference Model for Uplink Cellular OFDMA Networks Under Log-Normal Shadowing and Rayleigh Fading

Min Sagong;Kyungwhoon Cheun

IEEE Communications Letters
Year: 2012 | Volume: 16, Issue: 6 | Journal Article |
Cited by: Papers (6)
The performance of uplink cellular OFDMA networks transmitting multiple QAM symbols per hop is evaluated under log-normal shadowing and Rayleigh fading without resorting to a Gaussian approximation of the inter-cell interference. The derived interference statistic is observed to deviate significantly from the Gaussian distribution which may be exploited to dramatically enhance the network performa...Show More

A Statistical Inter-Cell Interference Model for Uplink Cellular OFDMA Networks Under Log-Normal Shadowing and Rayleigh Fading

Min Sagong;Kyungwhoon Cheun

Year: 2012 | Volume: 16, Issue: 6 | Journal Article |

Design of Irregular Weighted Nonbinary Repeat-Accumulate Codes over GF(q) with q-ary Orthogonal Modulation Using a Gaussian Approximation

Yongsang Kim;Kyungwhoon Cheun;Hyuntack Lim

IEEE Transactions on Communications
Year: 2011 | Volume: 59, Issue: 11 | Journal Article |
Using a Gaussian approximation to the distribution of the message vectors under density evolution, we design irregular weighted nonbinary repeat-accumulate codes over GF(q) with q-ary orthogonal modulation. The resulting codes achieve a frame error rate of 10-1 within 0.56 to 0.91 dB of channel capacity under the AWGN channel.Show More

Design of Irregular Weighted Nonbinary Repeat-Accumulate Codes over GF(q) with q-ary Orthogonal Modulation Using a Gaussian Approximation

Yongsang Kim;Kyungwhoon Cheun;Hyuntack Lim

Year: 2011 | Volume: 59, Issue: 11 | Journal Article |

Performance of Weighted Nonbinary Repeat-Accumulate Codes over GF(q) with q-ary Orthogonal Modulation

Yongsang Kim;Kyungwhoon Cheun;Hyuntack Lim

IEEE Transactions on Communications
Year: 2011 | Volume: 59, Issue: 5 | Journal Article |
Cited by: Papers (3)
An approximate upper bound is derived to the maximum likelihood decoding threshold of weighted nonbinary repeat-accumulate (WNRA) codes over GF(q) with q-ary orthogonal modulation and coherent detection over the additive white Gaussian noise channel. As with binary RA codes, WNRA codes show the potential for achieving the channel capacity with decreasing code rate for large enough q.Show More

Performance of Weighted Nonbinary Repeat-Accumulate Codes over GF(q) with q-ary Orthogonal Modulation

Yongsang Kim;Kyungwhoon Cheun;Hyuntack Lim

Year: 2011 | Volume: 59, Issue: 5 | Journal Article |

Design of Turbo Codes over GF(q) with q-ary Orthogonal Modulation

Yongsang Kim;Kyungwhoon Cheun;Kyeongcheol Yang;Min Sagong

IEEE Transactions on Communications
Year: 2011 | Volume: 59, Issue: 3 | Journal Article |
Cited by: Papers (6) | Patents (1)
A very simple design rule for parallel concatenated Turbo codes over GF(q) with q-ary orthogonal modulation is proposed. Unlike previously proposed exhaustive search methods, the proposed design rule allows straightforward and systematic code designs for any value of q ≥ 2 and any constraint length greater than 2.Show More

Design of Turbo Codes over GF(q) with q-ary Orthogonal Modulation

Yongsang Kim;Kyungwhoon Cheun;Kyeongcheol Yang;Min Sagong

Year: 2011 | Volume: 59, Issue: 3 | Journal Article |

Performance of Soft Decision Decoded Synchronous FHSS Multiple Access Networks Using MFSK Modulation under Rayleigh Fading

Sungnam Hong;Changkyu Seol;Kyungwhoon Cheun

IEEE Transactions on Communications
Year: 2011 | Volume: 59, Issue: 4 | Journal Article |
Cited by: Papers (11)
In this paper, we analyze the performance of soft decision decoded, synchronous, fast frequency-hopping spread-spectrum multiple-access networks using M-ary frequency shift keying in Rayleigh fading channels under the assumption that the number of frequency hopping slots is sufficiently large. The joint probability density function (pdf) of the absolute values of the correlator outputs is derived ...Show More

Performance of Soft Decision Decoded Synchronous FHSS Multiple Access Networks Using MFSK Modulation under Rayleigh Fading

Sungnam Hong;Changkyu Seol;Kyungwhoon Cheun

Year: 2011 | Volume: 59, Issue: 4 | Journal Article |

Iterative Receivers Based on Subblock Processing for Phase Noise Compensation in OFDM Systems

Myung-Kyu Lee;Kyeongcheol Yang;Kyungwhoon Cheun

IEEE Transactions on Communications
Year: 2011 | Volume: 59, Issue: 3 | Journal Article |
Cited by: Papers (24)
An iterative algorithm employing decision feedback provided by either an equalizer or a channel decoder is proposed in order to compensate for the phase noise resulting from imperfect oscillators in orthogonal frequency-division multiplexing (OFDM) systems. In the proposed algorithm, the received OFDM symbol is partitioned into subblocks in the time domain and the estimate of the time-average of t...Show More

Iterative Receivers Based on Subblock Processing for Phase Noise Compensation in OFDM Systems

Myung-Kyu Lee;Kyeongcheol Yang;Kyungwhoon Cheun

Year: 2011 | Volume: 59, Issue: 3 | Journal Article |

A Statistical Inter-Cell Interference Model for Downlink Cellular OFDMA Networks Under Log-Normal Shadowing with Ricean Fading

Changkyu Seol;Kyungwhoon Cheun;Sungnam Hong

IEEE Communications Letters
Year: 2010 | Volume: 14, Issue: 11 | Journal Article |
Cited by: Papers (11)
In this letter, an approximation to the performance of downlink cellular orthogonal frequency division multiple access networks under log-normal shadowing and Ricean fading is evaluated. The interference statistic is shown to significantly deviate from the Gaussian distribution as shown in previous results under Rayleigh fading.Show More

A Statistical Inter-Cell Interference Model for Downlink Cellular OFDMA Networks Under Log-Normal Shadowing with Ricean Fading

Changkyu Seol;Kyungwhoon Cheun;Sungnam Hong

Year: 2010 | Volume: 14, Issue: 11 | Journal Article |

Unitary space-time constellations based on quasi-orthogonal sequences

Jeongchang Kim;Kyungwhoon Cheun;Soongyoon Choi

IEEE Transactions on Communications
Year: 2010 | Volume: 58, Issue: 1 | Journal Article |
Cited by: Papers (9)
In this paper, we propose a novel class of unitary space-time constellations based on quaternary quasi-orthogonal sequences (QOSs), minimizing the maximum correlation between the signal matrices. The proposed design, owing to the underlying algebraic structure of the QOSs, allows for an efficient decoder structure while offering performance virtually identical to the unitary space-time constellati...Show More

Unitary space-time constellations based on quasi-orthogonal sequences

Jeongchang Kim;Kyungwhoon Cheun;Soongyoon Choi

Year: 2010 | Volume: 58, Issue: 1 | Journal Article |

Improving the performance of SM-MIMO/BICM-ID systems with LLR distribution matching

Qinghua Jia;Yongsang Kim;Changkyu Seol;Kyungwhoon Cheun

IEEE Transactions on Communications
Year: 2009 | Volume: 57, Issue: 11 | Journal Article |
Cited by: Papers (5)
In this paper, a distribution matching technique is proposed to process the extrinsic information produced by practical multiple-antenna detectors with iteratively demodulated, bit-interleaved coded modulation (BICM-ID). It is shown that significant gains may be achieved by appropriately processing the extrinsic information generated by practical multiple-antenna detectors before feeding it to the...Show More

Improving the performance of SM-MIMO/BICM-ID systems with LLR distribution matching

Qinghua Jia;Yongsang Kim;Changkyu Seol;Kyungwhoon Cheun

Year: 2009 | Volume: 57, Issue: 11 | Journal Article |

A statistical inter-cell interference model for downlink cellular OFDMA networks under log-normal shadowing and multipath Rayleigh fading

Changkyu Seol;Kyungwhoon Cheun

IEEE Transactions on Communications
Year: 2009 | Volume: 57, Issue: 10 | Journal Article |
The probability density function (PDF) of the intercell interference for downlink cellular orthogonal frequency division multiple access networks under log-normal shadowing and multipath Rayleigh fading is derived. The derived PDF is observed to highly deviate from the Gaussian distribution, especially at moderate to small network loads. Based on the derived inter-cell interference statistics, the...Show More

A statistical inter-cell interference model for downlink cellular OFDMA networks under log-normal shadowing and multipath Rayleigh fading

Changkyu Seol;Kyungwhoon Cheun

Year: 2009 | Volume: 57, Issue: 10 | Journal Article |

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