| Presentation | 2003/4/17 A Note on the DOA estimation using EM, SAGE algorithm Takahiro HAYASHI, Koichi ICHIGE, Hiroyuki ARAI, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Number of techniques for measuring the electromagnetic wave propagation environment have already been investigated in recent years. In those techniques, EM (expectation-Maximization) and SAGE (Space-Alternating Generalized Expectation maximization) algorithms, which are the optimization based on the maximum likelihood (ML) algorithms, attract interest due to their higher estimation accuracy than the super resolution (SR) algorithms like MUSIC or ESPRIT especially in a bad condition like low SNR (Signal-to-Noise Ratio).However, those ML algorithms have an inherent problem that convergence property deeply depends on the initial values to be optimized. Also the computational cost of those algorithms is much larger than by SR algorithms. In this paper, we employ the estimated DOAs by the SR algorithms (or by Beamformer method) as an initial value of the optimization by the ML algorithm, and see the convergence property. We confirm that the application of the ML algorithm can further improve the estimation accuracy of the SR algorithms. Moreever, we show that the computational cost can be drastically shortened by gradually reducing the parameter search region in optimization and by changing the resolution of paremeter search. Some computer simulation results show the performance and characteristics of the EM and SAGE algorithms. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | adaptive array antenna / DOA estimation / EM algorithm / SAGE algorithm |
| Paper # | SAT2003-10,A・P2003-10 |
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| Conference Information | |
| Committee | SAT |
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| Conference Date | 2003/4/17(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Satellite Telecommunications (SAT) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Note on the DOA estimation using EM, SAGE algorithm |
| Sub Title (in English) | |
| Keyword(1) | adaptive array antenna |
| Keyword(2) | DOA estimation |
| Keyword(3) | EM algorithm |
| Keyword(4) | SAGE algorithm |
| 1st Author's Name | Takahiro HAYASHI |
| 1st Author's Affiliation | Gratuate School of Engineering, Yokohama National University() |
| 2nd Author's Name | Koichi ICHIGE |
| 2nd Author's Affiliation | Gratuate School of Engineering, Yokohama National University |
| 3rd Author's Name | Hiroyuki ARAI |
| 3rd Author's Affiliation | Gratuate School of Engineering, Yokohama National University |
| Date | 2003/4/17 |
| Paper # | SAT2003-10,A・P2003-10 |
| Volume (vol) | vol.103 |
| Number (no) | 23 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |