| Presentation | 2009-08-04 A Study on Frequency Diversity and Multi-User Diversity in IFDMA Yuichi KAZAMA, Akira YAMASAKI, Koichi ADACHI, Masao NAKAGAWA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Single-carrier frequency division multiple access (SC-FDMA) has been decided to be adopted in the uplink of the future wireless communication system. Interleaved frequency division multiple access (IFDMA), whose transmitted signal is generated in the time domain, is a special case of SC-FDMA. The number of comb like spectrum and the spectral interval between each spectrum depend on the number of transmission data symbols Q in one IFDMA block and repetition number L. In the case of large Q and small L, large frequency diversity gain can be obtained due to the number of spectrum increases. However, inter-chip interference (ICI) owing to the multipaths environment is increased. In the multi-user environment, it is difficult to get multi-user diversity due to the decrease of the degree of freedom for channel allocation to each user. On the other hand, in the case of small Q and large L, frequency diversity gain obtained becomes smaller, and ICI is decreased. Furthermore, multi-user diversity can be obtained due to the increase of the degree of the freedom for channel allocation. Thus, in this paper, we derive average bit error rate (BER) performance of IFDMA in the multi-user environment theoretically by taking into account of frequency diversity, multi-user diversity and ICI when Q and L are changed and then average BER performance of IFDMA is compared to that of OFDM. In addition, the validity of the theoretical analysis is confirmed by computer simulation. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | IFDMA / Frequency diversity / Multi-user diversity / ICI |
| Paper # | RCS2009-97 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2009/7/27(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| 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) | A Study on Frequency Diversity and Multi-User Diversity in IFDMA |
| Sub Title (in English) | |
| Keyword(1) | IFDMA |
| Keyword(2) | Frequency diversity |
| Keyword(3) | Multi-user diversity |
| Keyword(4) | ICI |
| 1st Author's Name | Yuichi KAZAMA |
| 1st Author's Affiliation | School of Science for Open and Environmental Systems, Graduate School of Science and Technology, Keio University() |
| 2nd Author's Name | Akira YAMASAKI |
| 2nd Author's Affiliation | School of Science for Open and Environmental Systems, Graduate School of Science and Technology, Keio University |
| 3rd Author's Name | Koichi ADACHI |
| 3rd Author's Affiliation | School of Science for Open and Environmental Systems, Graduate School of Science and Technology, Keio University |
| 4th Author's Name | Masao NAKAGAWA |
| 4th Author's Affiliation | School of Science for Open and Environmental Systems, Graduate School of Science and Technology, Keio University |
| Date | 2009-08-04 |
| Paper # | RCS2009-97 |
| Volume (vol) | vol.109 |
| Number (no) | 164 |
| Page | pp.pp.- |
| #Pages | 6 |
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