| Presentation | 2005-01-28 Adaptive Sub-carrier Block Modulation with Differentially Modulated Pilot Symbol Assistance for Down-link OFDM Using Up-link Delay Spread Chang Jun AHN, Satoshi Takahashi, Hiroshi Harada, Yukiyoshi Kamio, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In an AMS/OFDM system, base station is in control of the modulation level of each sub-carrier, and then, adaptive modulated packet is transmitted from the base station to the mobile station. In this case, the mobile station is required the modulation level information (MLI) to demodulate the received packet. The MLI is generally transmitted as a data symbol, therefore, the throughput is degraded. In an OFDM, the channel response at a particular sub-carrier frequency is not supposed to be totally different from its neighboring frequencies, and hence, they must have correlation that depends on the coherence bandwidth of the channel Bc. If we could assign the same modulation level for coherently faded sub-carrier block, MLI is required only one time for each sub-carrier block. Moreover, we can assign the data on the empty space of pilot signals for increasing the total transmission. In this paper, we propose an adaptive sub-carrier block modulation with differentially modulated pilot symbol assistance for downlink OFDM using up-link delay spread. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | DMPSA-ASMS/OFDM / MLI / Coherence Bandwidth / RMS Delay Spread |
| Paper # | CS2004-191,RCS2004-298 |
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| Conference Information | |
| Committee | CS |
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| Conference Date | 2005/1/21(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Communication Systems (CS) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Adaptive Sub-carrier Block Modulation with Differentially Modulated Pilot Symbol Assistance for Down-link OFDM Using Up-link Delay Spread |
| Sub Title (in English) | |
| Keyword(1) | DMPSA-ASMS/OFDM |
| Keyword(2) | MLI |
| Keyword(3) | Coherence Bandwidth |
| Keyword(4) | RMS Delay Spread |
| 1st Author's Name | Chang Jun AHN |
| 1st Author's Affiliation | () |
| 2nd Author's Name | Satoshi Takahashi |
| 2nd Author's Affiliation | National Institute of Information and Communications Technology |
| 3rd Author's Name | Hiroshi Harada |
| 3rd Author's Affiliation | National Institute of Information and Communications Technology |
| 4th Author's Name | Yukiyoshi Kamio |
| 4th Author's Affiliation | National Institute of Information and Communications Technology |
| Date | 2005-01-28 |
| Paper # | CS2004-191,RCS2004-298 |
| Volume (vol) | vol.104 |
| Number (no) | 596 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |