| Presentation | 2002/7/12 VSF-OFCDM with Two-Dimensional Spreading Prioritizing Time Domain Spreading in Other-cell Interference Environment Yoshihisa Kishiyama, Noriyuki Maeda, Hiroyuki Atarashi, Mamoru Sawahashi, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper proposes a spreading factor control scheme that employs a larger spreading factor in the frequency domain associated with a greater frequency diversity effect to suppress other-cell interference for VSF-OFCDM (Variable Spreading Factor- Orthogonal Frequency and Code Division Multiplexing) using two-dimensional spreading prioritizing time domain spreading. Simulation results show that, compared with only time-domain spreading (spreading factors in the time and frequency domains are SF_Time = 16 and SF_Freq = 1, respectively), two-dimensional spreading (SF_Time = 16, SF_Freq = 8) decreases the required I_or/I_oc (I_or and I_oc represent the total received signal power transmitted from the desired base station and the total received interference power from other cells plus background noise, respectively). Concretely, when the spreading factor control is performed maintaining a constant throughput, the required I_or/I_oc to achieve the average PER (Packet Error Rate) = 10^-2 is reduced by approximately 1.2 - 1.9 dB. Furthermore, when the throughput is reduced by 1/8 from the case of SF_Time = 16, SF_Freq = 1,and C_mux = 8 code-multiplexing, the combination of SF_Time = 16, SF_Freq 8, and C_mux = 8 using two-dimensional spreading decreases the required I_or/I_oc by approximately 2.0 dB compared with that of SF_Time = 16, SF_Freq = 1, and C_mux = 1 using only time-domain spreading (12-path exponential decayed Rayleigh fading, r.m.s. delay spread = 0.34 μsec, and maximum Doppler frequency = 20 Hz). |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | broadband packet wireless access / VSF-OFCDM / two-dimensional spreading / other-cell interference / spreading factor control |
| Paper # | NS2002-105 |
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| Conference Information | |
| Committee | NS |
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| Conference Date | 2002/7/12(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Network Systems(NS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | VSF-OFCDM with Two-Dimensional Spreading Prioritizing Time Domain Spreading in Other-cell Interference Environment |
| Sub Title (in English) | |
| Keyword(1) | broadband packet wireless access |
| Keyword(2) | VSF-OFCDM |
| Keyword(3) | two-dimensional spreading |
| Keyword(4) | other-cell interference |
| Keyword(5) | spreading factor control |
| 1st Author's Name | Yoshihisa Kishiyama |
| 1st Author's Affiliation | Wireless Laboratories, NTT DoCoMo, Inc.() |
| 2nd Author's Name | Noriyuki Maeda |
| 2nd Author's Affiliation | Wireless Laboratories, NTT DoCoMo, Inc. |
| 3rd Author's Name | Hiroyuki Atarashi |
| 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 | 2002/7/12 |
| Paper # | NS2002-105 |
| Volume (vol) | vol.102 |
| Number (no) | 203 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |