| Presentation | 2012-03-08 Comparison/discussion on pilot-signals for channel estimation in LTE-advanced uplink CoMP Kazuki TAKEDA, Akihiko NISHIO, Takashi IWAI, Yoshihiko OGAWA, Daichi IMAMURA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Introduction of coordinated multipoint (CoMP) operation for heterogeneous network deployment (HetNet) is discussed in LTE-Advanced (LTE-A) uplink. In the HetNet, uplink signals of macro and pico users (UEs) suffer from interference each other. However, by using CoMP reception, the uplink signals received at macro and pico nodes can be combined/separated in a multi-user (MU) MIMO manner and hence their performances can be significantly improved. In order to realize such spatial multiplexing, pilot signals transmitted by different UEs should be multiplexed/demultiplexed on the same frequency. Although the current uplink demodulation reference signal (DMRS) supports spatial multiplexing, its capability is not enough when the frequency-positions of multiplexed DMRSs are different. In this paper, we present a problem of current DMRS orthogonality in HetNet and then propose a frequency-dependent (FD) DMRS that achieves higher orthogonality among MU-MIMO UEs. We evaluate system and cell-edge throughput performances by system-level simulation. The simulation result reveals that the advantage of FD-DMRS over current DMRS is at least around 10%. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | LTE-Advanced / uplink / clusterd DFT-S-OFDM / CoMP / DMRS / channel estimation |
| Paper # | RCS2011-339 |
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| Committee | RCS |
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| Conference Date | 2012/2/29(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) | Comparison/discussion on pilot-signals for channel estimation in LTE-advanced uplink CoMP |
| Sub Title (in English) | |
| Keyword(1) | LTE-Advanced |
| Keyword(2) | uplink |
| Keyword(3) | clusterd DFT-S-OFDM |
| Keyword(4) | CoMP |
| Keyword(5) | DMRS |
| Keyword(6) | channel estimation |
| 1st Author's Name | Kazuki TAKEDA |
| 1st Author's Affiliation | Tokyo R&D Center, Panasonic Corporation() |
| 2nd Author's Name | Akihiko NISHIO |
| 2nd Author's Affiliation | Tokyo R&D Center, Panasonic Corporation |
| 3rd Author's Name | Takashi IWAI |
| 3rd Author's Affiliation | Panasonic Mobile Communications R&D Lab. Co., Ltd |
| 4th Author's Name | Yoshihiko OGAWA |
| 4th Author's Affiliation | Tokyo R&D Center, Panasonic Corporation |
| 5th Author's Name | Daichi IMAMURA |
| 5th Author's Affiliation | Tokyo R&D Center, Panasonic Corporation |
| Date | 2012-03-08 |
| Paper # | RCS2011-339 |
| Volume (vol) | vol.111 |
| Number (no) | 451 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |