Search Results - "Lee, Wookbong"
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Downlink Vertical Beamforming Designs for Active Antenna Systems
Published in IEEE transactions on communications (01-06-2014)“…In this paper, we study a vertical beamforming technique for multiple-input multiple-output downlink multi-user systems. In general, the transmit antenna gain…”
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Journal Article -
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A New Beamforming Design for Multicast Systems
Published in IEEE transactions on vehicular technology (01-10-2013)“…In this paper, we study a transmit beamforming technique for multiple-input-multiple-output (MIMO) downlink multicast systems. Assuming that channel state…”
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Journal Article -
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Multi-BS MIMO cooperation: challenges and practical solutions in 4G systems
Published in IEEE wireless communications (01-02-2012)“…Various multiple-input multiple-output techniques have been introduced to improve performance of next-generation systems. In single-cell environments,…”
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Journal Article -
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Mapping Optimization for Space-Time Bit-Interleaved Coded Modulation With Iterative Decoding
Published in IEEE transactions on communications (01-04-2007)“…For space-time bit-interleaved coded modulation (ST-BICM) systems with iterative decoding, the overall performance is affected by the chosen mapping. In…”
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Journal Article -
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Downlink Vertical Beamforming Designs for Multi-User MISO Systems
Published in 2015 IEEE 81st Vehicular Technology Conference (VTC Spring) (01-05-2015)“…In this paper, we study a transmit beamforming technique for multiple input single output downlink multi-user systems with directional antennas where a…”
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Conference Proceeding -
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Power Allocation Algorithms for ZF-THP Sum Rate Optimization in Multi-User Multi-Antenna Systems
Published in 2012 IEEE 75th Vehicular Technology Conference (VTC Spring) (01-05-2012)“…In this paper, we study a power allocation technique for Tomlinson-Harashima precoding (THP) in multi- user multiple input single output (MISO) downlink…”
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Conference Proceeding
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Single Carrier Waveform Solution for Millimeter Wave Air Interface
Published in 2016 IEEE Globecom Workshops (GC Wkshps) (01-12-2016)“…Ultra broadband mobile communication is a key requirement of fifth generation (5G) wireless cellular networks. To fulfill this requirement much larger…”
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Conference Proceeding -
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3D beamforming designs for Single User MISO systems
Published in 2013 IEEE Global Communications Conference (GLOBECOM) (01-12-2013)“…In this paper, we study a transmit beamforming technique for multiple input single output downlink single-user systems with three dimensional antennas where a…”
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Conference Proceeding -
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A New Stream Power Allocation Method for SU Beamforming in BICM MIMO-OFDM Systems for IEEE WLAN
Published in 2021 IEEE 93rd Vehicular Technology Conference (VTC2021-Spring) (01-04-2021)“…In this paper, we propose a new stream power allocation method for single-user beamforming for BICM MIMO-OFDM systems. To this end, we first employ a mean…”
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Conference Proceeding -
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A New Divide and Conquer Based SVD Algorithm for Beamforming Matrix for MIMO Systems
Published in 2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall) (01-09-2019)“…In this paper, we present a low-complexity singular value decomposition (SVD) algorithm to generate a transmit beamforming matrix for multiple-input…”
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Conference Proceeding -
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Interference mitigation techniques for femtocell networks
Published in 2013 International Symposium on Intelligent Signal Processing and Communication Systems (01-11-2013)“…In femtocell networks, low-cost and low-power femto base stations are overlaid on macro cellular systems, and thereby interference between the femtocell to the…”
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Conference Proceeding -
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Enhanced Precoding Design with Adaptive Beam Width for 5G New Radio Systems
Published in 2017 IEEE 86th Vehicular Technology Conference (VTC-Fall) (01-09-2017)“…Multiple-Input Multiple-Output (MIMO) is considered as a key technology for next generation wireless cellular systems. Depending on the scenario and…”
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Conference Proceeding -
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Mapping optimization for space-time bit-interleaved coded modulation with iterative decoding
Published in VTC-2005-Fall. 2005 IEEE 62nd Vehicular Technology Conference, 2005 (2005)Get full text
Conference Proceeding -
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Channel equalization technique for space time block codes in non quasi-static channels
Published in IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 (2004)“…Conventional space time block codes (STBC) assume quasi-static channel environments. If this assumption is not satisfied, then these schemes show serious…”
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Conference Proceeding -
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Mapping optimization for space-time block coded OFDM systems with iterative decoding
Published in 2005 IEEE 61st Vehicular Technology Conference (2005)“…An iterative detection scheme enhances the performance of bit-interleaved coded modulation (BICM) by exploiting frequency diversity gains. Additionally,…”
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Conference Proceeding -
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MIMO techniques in WiMAX and LTE: a feature overview
Published in IEEE communications magazine (01-05-2010)“…IEEE 802.16m and 3GPP LTE-Advanced are the two evolving standards targeting 4G wireless systems. In both standards, multiple-input multiple-output antenna…”
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Magazine Article