| Presentation | 2012-05-18 MMSE Precoding using the Second-Order Statistics of Channels for Multiuser MIMO Communications Masayuki HARADA, Kazuhiko FUKAWA, Hiroshi SUZUKI, Satoshi SUYAMA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This report proposes a minimum mean-square error (MMSE) precoding method using the second-order statistics for multiuser MIMO mobile communications. In the multiuser MIMO, the MMSE precoding is one of the most promising techniques to suppress co-channel interference among users as major impairment. The MMSE precoding multiplies a transmitted signal vector by a modified pseudo-inverse of the channel matrix for suppressing the co-channel interference, and requires feedback of channel state information (CSI) in the case of frequency division duplex (FDD) systems. Conversely, the proposed MMSE precoding estimates the second-order statistics of the channels from the average and covariance of incidence angles of propagation paths, and thus does not need CSI feedback. Specifically, on the assumption that an incidence angle distribution in the uplink channel is the same as that in the downlink channel, the proposed scheme estimates the autocorrelation matrix of the downlink from the average and covariance of incidence angles in the uplink. Using the estimate of the autocorrelation matrix of the downlink, the proposed scheme controls directivity of transmit antennas so that the main beam and nulls can be turned toward desired and other user terminals, respectively. Under the condition of quasi-static frequency flat channels with three transmit antennas and two user terminals employing one receive antenna, computer simulations show that the proposed scheme, which does not need CSI feedback, is little inferior in BER performance to the conventional MMSE precoding that requires CSI feedback. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Mobile communication / multiuser MIMO / precoding / MMSE / second-order statistics |
| Paper # | RCS2012-38 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2012/5/10(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) | MMSE Precoding using the Second-Order Statistics of Channels for Multiuser MIMO Communications |
| Sub Title (in English) | |
| Keyword(1) | Mobile communication |
| Keyword(2) | multiuser MIMO |
| Keyword(3) | precoding |
| Keyword(4) | MMSE |
| Keyword(5) | second-order statistics |
| 1st Author's Name | Masayuki HARADA |
| 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 | 2012-05-18 |
| Paper # | RCS2012-38 |
| Volume (vol) | vol.112 |
| Number (no) | 29 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |