| Presentation | 2007-06-29 Reduction of Feedback Overload by Exploiting Adaptive Channel in OFDMA systems Satoru IIJIMA, Takamasa HASEGAWA, Rui ZHOU, Iwao SASASE, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In channel adaptive OFDMA systems, it is important to feed back channel information in a fast, accurate and efficient way to improve the system performance, such as throughput and bit error rate (BER). However, a base station requires a large amount of feedback information of channel state information (CSI). In order to reduce the overload of CSI feedback, we propose a feedback scheme which only selects the users scheduled in the next time slot to feedback the channel information according to user mobility. We use adaptive modulation to apply bit rate adaptation depending on user channel condition, where the scheduling time is fixed. By fixing the packet size, scheduling time and feedback period can be variable according to user transmission rate as different time slots. We demonstrate by computer simulation that the proposed scheme can reduce the overload of user feedback with the minimum suppression of the throughput degradation. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | OFDMA / CSI / Adaptive modulation / Doppler frequency |
| Paper # | RCS2007-23 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2007/6/21(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Radio Communication Systems (RCS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Reduction of Feedback Overload by Exploiting Adaptive Channel in OFDMA systems |
| Sub Title (in English) | |
| Keyword(1) | OFDMA |
| Keyword(2) | CSI |
| Keyword(3) | Adaptive modulation |
| Keyword(4) | Doppler frequency |
| 1st Author's Name | Satoru IIJIMA |
| 1st Author's Affiliation | Dept. of Information and Computer Science, Keio University() |
| 2nd Author's Name | Takamasa HASEGAWA |
| 2nd Author's Affiliation | Dept. of Information and Computer Science, Keio University |
| 3rd Author's Name | Rui ZHOU |
| 3rd Author's Affiliation | Dept. of Information and Computer Science, Keio University |
| 4th Author's Name | Iwao SASASE |
| 4th Author's Affiliation | Dept. of Information and Computer Science, Keio University |
| Date | 2007-06-29 |
| Paper # | RCS2007-23 |
| Volume (vol) | vol.107 |
| Number (no) | 113 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |