OFDM Multiple Antennas Cognitive Radio Relay Synchronization CDMA Channel Estimation Spectrum Sharing Interference Cancellation Full duplex Spectrum Sensing Neural Networks Resource Allocation Stochastic Geometry Equalizer Bi-Directional Feedback Femtocell Heterogeneous Networks Energy Harvesting Device-to-Device (D2D) Cell Search Spectral efficiency NOMA FBMC interference management Dynamic TDD Cross-link interference SINR mismatch problem HetNet Idle cells Ultra-dense small cell networks achievable sum rate outage probability multi-spectral full-duplex relay selection diversity bursty traffic model mode selection Handoff CP-OFDM non-orthogonal multiple access self-interference cancellation Complexity HST full-duplex cellular interference coordination Cognitive relay networks Time spreading beamforming Link adaptation Heterogeneous channel estimation capability coexistence MU-MIMO full-spreading NOMA GFDM Bi-directional full-duplex OQAM sensing duration Correlated MIMO Simultaneous Sensing and Transmission transmission capacity (TC) Two-way communications in-band full-duplex system automatic repeat request (ARQ) UWB interference mitigation TS-W-OFDM Windowing time-frequency efficiency eigen decomposition pilot signal 5G networks prototype filter Aggregate interference Long Term Evolution-Advanced interference to noise ratio resource size control link reliability mixed numerology Vehicle-to-vehicle communication LTE-based V2V Coexistence scenarios Resource management Singular Vale Decomposition Cooperative systems Filtered OFDM tabu-search Asynchronous Transmission Reliability Vehicle-to-Vehicle C-V2V Mobility MLP 5G flexible duplex Preamble Grant-free Transmission Railway Deep learning massive connectivity
Status : Published 
Date : 2012-12 
Title : OFDMA with Variable Tone Spaces 
Authors : Sungmook Lim, Gosan Noh, Jihaeng Heo, Hyungjong Kim and Daesik Hong 
Journal : IEEE Wireless Comm. Magazine 
Abstract : Next generation wireless networks such as 3GPP long term evolution - advanced (LTE-A) demand enhanced system capacity for high quality multimedia services. Carrier aggregation (CA) based on orthogonal frequency division multiple access (OFDMA) has been introduced to achieve this. In CA, each component carrier can be located on a different frequency band and each user utilizing it moves at a different speed. This results in different channel characteristics for each user. Enhancing the system capacity in this environment requires a multiple access scheme that considers different channel characteristics among users. However, conventional OFDMA using fixed tone space (called OFDMAFTS)does not consider user-specific channel characteristics, resulting in capacity degradation.
In this article, we propose a new OFDMA system with variable tone spaces (OFDMA-VTS) as an approach to enhancing the system capacity. OFDMA-VTS selects the tone space suitable for each user by considering user-specific channel characteristics in CA. When inter-symbol interference (ISI) is dominant due to a long delay spread, the small tone space is selected to eliminate severe ISI. Conversely, when inter-carrier interference (ICI) due to a large Doppler spread severely degrades the system performance, the large tone space is selected to compensate ICI. In the proposed OFDMA-VTS, each user adaptively selects the optimal tone space needed to minimize the total interference of ISI and ICI, therefore enhancing the system capacity. 
URL : http://ieeexplore.ieee.org/xpl/articleDe...er=6393526 
Download : http://mirinae.yonsei.ac.kr/?module=file...ff5b9ba7bb 

Lim, S.; Noh, G.; Heo, J.; Kim, H.; Hong, D.; , "OFDMA with variable tone spaces," Wireless Communications, IEEE , vol.19, no.6, pp.113-120, December 2012
doi: 10.1109/MWC.2012.6393526
keywords: {Bandwidth;Bit error rate;Delay;Doppler effect;OFDM;Synchronization;Transmitters;}
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6393526&isnumber=6393507

List of Articles
No.
Status Datesort
12 [IEEE Comm. Surveys & Turotials] Dongkyu Kim, Haesoon Lee, and Daesik Hong, "A Survey of In-band Full-duplex Transmission: From the Perspective of PHY and MAC Layers", IEEE Comm. Surveys & Turotials file Published  2015-02 
11 [IEEE Trans. Commun.] Jemin Lee, Jeffrey G. Andrews, and Daesik Hong, "Spectrum-Sharing Transmission Capacity with Interference Cancellation", IEEE Transactions on Communications, Jan. 2013 file Published  2013-01 
» [IEEE Wireless Commun. Mag.] Sungmook Lim, Gosan Noh, Jihaeng Heo, Hyungjong Kim and Daesik Hong,"OFDMA with Variable Tone Spaces", IEEE Wireless Comm. Magazine, Dec. 2012 file Published  2012-12 
9 [Other Journals] Sangho Nam, Sungmook Lim. Kyunbyong Ko, Daesik Hong, "A New Multistage Whitener-Based Detector for MIMO Systems", Wireless Personal Comm., Nov. 2011 file Published  2011-11 
8 [IEEE Trans. Wireless Commun.] Kyungchul Kwak, Sungeun Lee, Hyunkee Min, Sooyong Choi, and Daesik Hong, "New OFDM Channel Estimation with Dual-ICI Cancellation in Highly Mobile Channel," IEEE Trans. Wireless Commun., Oct. 2010 file Published  2010-10 
7 [IEEE Trans. Wireless Commun.] Hyungsik Ju, Eunsung Oh, Daesik Hong 'Improving Efficiency of Resource Usage in Two-Hop Full Duplex Relay Systems based on Resource Sharing and Interference Cancellation' IEEE Trans. Wireless Comm., Aug 2009 file Published  2009-08 
6 [IEEE Trans. Veh. Technol.] Seungyoup Han, Eunsung Oh, Myeongsu Han and Daesik Hong, "Performance Analysis of Multistage Interference Cancellation for Asynchronous TH-UWB Systems in Multipath Fading Channels", IEEE Trans. Veh. Technol., Mar 2009 file Published  2009-03 
5 [IEICE Trans. Commun.] Dongju Kim Kyunbyoung Ko Jeongho Park, Daesik Hong, "Average BER Analysis for Multicode 64-QAM CDMA Systems with an MPIC", IEICE Trans. Comm., Feb 2009 Published  2009-02 
4 [IEEE Trans. Veh. Technol.] Hyungjoon Song, Jihyung Kim and Daesik Hong, "Joint Doppler-Frequency Diversity for OFDM Systems Using Hybrid Interference Cancellation", IEEE Trans. Veh. Technol., Jan 2008 Published  2008-01 
3 [IEEE Commun. Lett.] Kyunbyoung Ko, Mansic Joo, Hansup Lee and Daesik Hong, "Performance analysis for multistage interference cancellers in asynchronous DS-CDMA systems", IEEE Comm. Letters, Dec 2002 Published  2002-12 
2 [IEICE Trans. Commun.] Jaehee Cho, Namshin Cho, Keukjoon Bang, Myunghee Park, Heeyoung Jun, Hyuncheol Park and Daesik Hong, "Multistage Decision Feedback Channel Estimation for DS/CDMA Systems with M-Ary Orthogonal Modulation", IEICE Trans. Comm., Aug 2001 Published  2001-08 
1 [IEEE Commun. Lett.] Dae-Ki Hong, Tae-Yoon Kim, Daesik Hong and Chang-Eon Kan, "Pilot to Data Channel Power Allocation for PCA-DS/CDMA with Interference Canceler", IEEE Comm. Letters, Aug 2001 Published  2001-08