Name
Abstract | ||
|---|---|---|
Next generation wireless networks such as 3GPP LTE-A demand enhanced system capacity for high-quality multimedia services. Carrier aggregation based on 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 OFDMA-FTS) 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 enhance system capacity. OFDMA-VTS selects the tone space suitable for each user by considering userspecific channel characteristics in CA. When intersymbol interference is dominant due to a long delay spread, the small tone space is selected to eliminate severe ISI. Conversely, when intercarrier interference 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 system capacity. |
Year | DOI | Venue |
|---|---|---|
2012 | 10.1109/MWC.2012.6393526 | IEEE Wireless Commun. |
Keywords | Field | DocType |
component carrier,isi elimination,ofdma-fts,system capacity enhancement,next generation networks,delay spread,ofdm modulation,optimal tone space,next generation wireless networks,fixed tone space,carrier aggregation,frequency division multiple access,3g mobile communication,multiple access scheme,ofdma-vts,userspecific channel characteristics,doppler spread,variable tone spaces,intercarrier interference,interference suppression,high-quality multimedia services,3gpp lte-a demand,intersymbol interference,wireless networks,bit error rate,doppler effect,synchronization,ofdm,transmitters | Wireless network,Intersymbol interference,Telecommunications,Computer science,Delay spread,Communication channel,Computer network,Electronic engineering,Interference (wave propagation),Frequency-division multiple access,Orthogonal frequency-division multiplexing,Bit error rate | Journal |
Volume | Issue | ISSN |
19 | 6 | 1536-1284 |
Citations | PageRank | References |
1 | 0.37 | 0 |
Authors | ||
5 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Sungmook Lim | 1 | 562 | 38.81 |
| Gosan Noh | 2 | 71 | 11.71 |
| Jihaeng Heo | 3 | 80 | 6.18 |
| Hyung-Jong Kim | 4 | 278 | 27.13 |
| Daesik Hong | 5 | 3090 | 242.02 |