| Presentation | 2012-03-09 Design Method of Relative Magnitude Coefficients Considering Rotation of Basis Vectors in Interference Space on the K-User MIMO Interference Channel for Downlink System Kunitaka MATSUMURA, Tomoaki OHTSUKI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Recently, to improve the capacity of cell-edge user, interference alignment (IA) is an intense research interest. Because of avoiding huge dimensions of signal space, the IA algorithms, that is extended to the multiple-input multiple-output (MIMO) interference network, are reported conventionally. In IA algorithm, each coordinated transmitter generates the beamforming vector to align interference from different transmitters into confined subspace at each receiver. Then, in the conventional IA algorithm, using singular value decomposition (SVD) with the relative magnitude coefficients, transmitters calculate the beamforming vectors and the received vectors. However, this method can not decide the value of the relative magnitude coefficients so that the system capacity is improved, because SVD is too complicated to evaluate the system capacity with the relative magnitude coefficients. In this report, we propose the design method of the relative magnitude coefficient of interference channels to improve the system capacity of the conventional IA scheme. To decide the values of the relative magnitude coefficients, we define the evaluation function developed by calculating the null space using Gram-Schmidt orthogonalization. Through Monte Carlo simulation, we show that the proposed method achieves a higher system capacity than the conventional method. In addition, we show that the proposed method needs much lower complexity to calculate the null space than SVD. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Interference Alignment(IA) / Multi-user MIMO / Beamforming / Gram-Schmidt orthogonalization |
| Paper # | RCS2011-360 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2012/2/29(1days) |
| Place (in Japanese) | (See Japanese page) |
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| 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) | Design Method of Relative Magnitude Coefficients Considering Rotation of Basis Vectors in Interference Space on the K-User MIMO Interference Channel for Downlink System |
| Sub Title (in English) | |
| Keyword(1) | Interference Alignment(IA) |
| Keyword(2) | Multi-user MIMO |
| Keyword(3) | Beamforming |
| Keyword(4) | Gram-Schmidt orthogonalization |
| 1st Author's Name | Kunitaka MATSUMURA |
| 1st Author's Affiliation | Department of Information and Computer Science, Keio University() |
| 2nd Author's Name | Tomoaki OHTSUKI |
| 2nd Author's Affiliation | Department of Information and Computer Science, Keio University |
| Date | 2012-03-09 |
| Paper # | RCS2011-360 |
| Volume (vol) | vol.111 |
| Number (no) | 451 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |