Young Kyun Kim

Samsung Advanced Institute of Technology, Usan-ri, Gyeonggi Province, South Korea

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Publications (2)7.46 Total impact

  • Jaehak Chung · Chan-Soo Hwang · Kiho Kim · Young Kyun Kim
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    ABSTRACT: A random beamforming technique for multiple-input multiple-output (MIMO) systems that simultaneously obtains downlink multiuser diversity gain, spatial multiplexing gain and array gain by feeding back only effective signal-to-noise ratios (SNRs) is described. In addition, power control using waterfilling is employed to improve the throughput of our method in correlated channels. In a slow fading channel, we prove that the throughput of the proposed method converges to that of eigen beamforming when many users are in a cell. The number of users required to achieve capacity bound increases with the number of antennas and SNR was determined. However, the capacity bound is achieved even with a small number of users, e.g., 16 users in a cell, when the SNR is low, e.g., 0 dB, and the number of transmit and receive antenna is small, e.g., two. We also find that the effect of waterfilling is more noticeable in correlated channels.
    IEEE Journal on Selected Areas in Communications 07/2003; 21(5-21):848 - 855. DOI:10.1109/JSAC.2003.810355 · 3.45 Impact Factor
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    ABSTRACT: This article introduces the vision and requirements for future development of mobile communications systems, and discusses several key enabling technologies such as modulation and multiple access schemes, multiple antenna techniques, and an IP-based network, considered important to realize this vision in real-world systems.
    IEEE Communications Magazine 04/2003; 41(3-41):120 - 124. DOI:10.1109/MCOM.2003.1186555 · 4.01 Impact Factor