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Sungmook Lim, Gosan Noh, Jihaeng Heo, Hyungjong Kim and Daesik Hong,"OFDMA with Variable Tone Spaces", IEEE Wireless Comm. Magazine, Dec. 2012
[IEEE Wireless Commun. Mag.]
조회 38354
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
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