| Presentation | 2002/5/17 VSF-OFCDM Using Two-Dimensional Spreading and Its Performance Noriyuki MAEDA, Hiroyuki ATARASHI, Sadayuki ABETA, Mamoru SAWAHASHI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper proposes spreading factor control in the frequency and time domains for VSF-OFCDM (Variable Spreading Factor-Orthogonal Frequency and Code Division Multiplexing) that employs two-dimensional spreading to maximize the radio link capacity based on cell configuration, radio link parameters (modulation and coding schemes, spreading factor, and number of code-multiplexing), and radio link conditions (delay spread and Doppler frequency). Furthermore, we propose an orthogonal spreading code assignment method appropriate for two-dimensional spreading, and the simulation results demonstrate the performance of VSF-OFCDM that employs two-dimensional spreading. The simulation results show that when we employ QPSK data modulation with the channel coding rate R = 3/4 of turbo coding, VSF-OFCDM using only frequency domain spreading (spreading factor SF = 16 and 32) achieves the best performance to maintain the lowest required average received E_s/N_0(signal energy per symbol-to-background noise spectrum density ratio). Meanwhile, in the case of 16QAM data modulation with R = 1/2 turbo coding, if the number of multiplexed codes is more than 1/2 of SF (SF = 16 and 32), VSF-OFCDM using two-dimensional spreading achieves the better performance compared with that using only frequency domain spreading. (Required average packet error rate 10^<-2>, 12-path exponential decayed Rayleigh fading channel, delay spread = 0.34 ,μsec) |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | broadband packet wireless access / VSF-OFCDM / two-dimensional spreading / spreading factor control |
| Paper # | RCS2002-61 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2002/5/17(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| 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) | VSF-OFCDM Using Two-Dimensional Spreading and Its Performance |
| Sub Title (in English) | |
| Keyword(1) | broadband packet wireless access |
| Keyword(2) | VSF-OFCDM |
| Keyword(3) | two-dimensional spreading |
| Keyword(4) | spreading factor control |
| 1st Author's Name | Noriyuki MAEDA |
| 1st Author's Affiliation | Wireless Laboratories, NTT DoCoMo, Inc.() |
| 2nd Author's Name | Hiroyuki ATARASHI |
| 2nd Author's Affiliation | Wireless Laboratories, NTT DoCoMo, Inc. |
| 3rd Author's Name | Sadayuki ABETA |
| 3rd Author's Affiliation | Wireless Laboratories, NTT DoCoMo, Inc. |
| 4th Author's Name | Mamoru SAWAHASHI |
| 4th Author's Affiliation | Wireless Laboratories, NTT DoCoMo, Inc. |
| Date | 2002/5/17 |
| Paper # | RCS2002-61 |
| Volume (vol) | vol.102 |
| Number (no) | 86 |
| Page | pp.pp.- |
| #Pages | 6 |
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