| Presentation | 2010-08-27 Robust Precoding Scheme against Imperfect CSI for Multiuser MIMO-OFDM Downlink Systems Linchen CHANG, Kazuhiko FUKAWA, Hiroshi SUZUKI, Satoshi SUYAMA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In a downlink multiuser MIMO-OFDM system, a transmitter usually employs linear precoding for reducing cochannel interference among users. However, channel state information(CSI)that is fed back from receivers to the transmitter includes estimation and quantization errors. This report proposes a precoding scheme robust to such imperfect CSI in the downlink multiuser MIMO-OFDM system. Considering that the receivers perform the maximum likelihood detection, the proposed precoding scheme estimates the precoding matrix that can minimize the total bit error rate(BER)of the mobile stations, and is referred to as the minimum average BER(MABER)precoding. As its cost function, an upper bound of the average BER is derived from the Chernoff bound of the pairwise error probability(PEP)and is averaged with respect to CSI errors. To obtain the precoding matrix that can minimize such a cost function under a constraint of transmitted power, the MABER precoding performs iterative estimation by the steepest descent algorithm. The initial guess is set to the precoding matrix of zero-forcing(ZF). When the numbers of transmit antennas, receivers, and receive antennas per receiver are set to 2, 2, and 1, respectively, computer simulations demonstrate that the MABER precoder is superior in BER to the conventional ZF precoder under a frequency-selective fading condition. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Multiuser MIMO / MIMO-OFDM / precoding / imperfect channel state information / steepest descent method |
| Paper # | RCS2010-94 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2010/8/19(1days) |
| Place (in Japanese) | (See Japanese page) |
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| 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) | Robust Precoding Scheme against Imperfect CSI for Multiuser MIMO-OFDM Downlink Systems |
| Sub Title (in English) | |
| Keyword(1) | Multiuser MIMO |
| Keyword(2) | MIMO-OFDM |
| Keyword(3) | precoding |
| Keyword(4) | imperfect channel state information |
| Keyword(5) | steepest descent method |
| 1st Author's Name | Linchen CHANG |
| 1st Author's Affiliation | Tokyo Institute of Technology() |
| 2nd Author's Name | Kazuhiko FUKAWA |
| 2nd Author's Affiliation | Tokyo Institute of Technology |
| 3rd Author's Name | Hiroshi SUZUKI |
| 3rd Author's Affiliation | Tokyo Institute of Technology |
| 4th Author's Name | Satoshi SUYAMA |
| 4th Author's Affiliation | Tokyo Institute of Technology |
| Date | 2010-08-27 |
| Paper # | RCS2010-94 |
| Volume (vol) | vol.110 |
| Number (no) | 175 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |