| Presentation | 2019-01-18 Performance Improvement of DOA Estimation Using Two-step Search Method Based on Compressed Sensing Toshiya Nasu, Nobuyoshi Kikuma, Kunio Sakakibara, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In recent years, researches for applying signal-processing techniques based on sparse reconstruction andcompressed sensing to DOA (Direction-Of-Arrival) estimation of radio waves have been actively conducted. As oneof the optimization algorithms, ISTA (Iterative Shrinkage-Thresholding Algorithm) employing the steepest gradientmethod is used. In this algorithm, the signal parameters are searched through iterative updating with a constantstep size in the gradient direction, so it takes much time to converge. On the other hand, the conjugate gradient(CG) method is conventionally known as an optimization algorithm with fast convergence, which actually can per-form high-speed parameter searching by using the conjugate properties of search vectors. In the previous papers,the authors proposed two-step search method in which the two algorithms are combined, and it was shown that theestimation accuracy could be improved by using ISTA at the first step and CG method at the second step. In thispaper, the condition used for convergence is examined to improve further the performance of the two-step searchmethod. As a result, it is confirmed that the estimation accuracy is significantly improved and also the computationtime is considerably reduced when setting the convergence condition appropriately. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | DOA estimation / Compressed sensing / ISTA / Conjugate gradient method / Two-step search method |
| Paper # | AP2018-160 |
| Date of Issue | 2019-01-10 (AP) |
| Conference Information | |
| Committee | WPT / AP |
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| Conference Date | 2019/1/17(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Toyota Automobile Museum |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Wireless transmission technology, Radio propagation, Antennas and Propagation |
| Chair | Masaharu Takahashi(Chiba Univ.) / Jiro Hirokawa(Tokyo Tech.) |
| Vice Chair | / Ryo Yamaguchi(SoftBank) |
| Secretary | (Hokkaido Univ.) / Ryo Yamaguchi(Yamaguchi Univ.) |
| Assistant | Masahiro Hanazawa(UL Japan) / Nozomi Haga(Gunma Univ.) / Michitaka Ameya(AIST) |
| Paper Information | |
| Registration To | Technical Committee on Wireless Power Transfer / Technical Committee on Antennas and Propagation |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Performance Improvement of DOA Estimation Using Two-step Search Method Based on Compressed Sensing |
| Sub Title (in English) | |
| Keyword(1) | DOA estimation |
| Keyword(2) | Compressed sensing |
| Keyword(3) | ISTA |
| Keyword(4) | Conjugate gradient method |
| Keyword(5) | Two-step search method |
| 1st Author's Name | Toshiya Nasu |
| 1st Author's Affiliation | Nagoya Institute of Technology(NITech) |
| 2nd Author's Name | Nobuyoshi Kikuma |
| 2nd Author's Affiliation | Nagoya Institute of Technology(NITech) |
| 3rd Author's Name | Kunio Sakakibara |
| 3rd Author's Affiliation | Nagoya Institute of Technology(NITech) |
| Date | 2019-01-18 |
| Paper # | AP2018-160 |
| Volume (vol) | vol.118 |
| Number (no) | AP-390 |
| Page | pp.pp.51-56(AP), |
| #Pages | 6 |
| Date of Issue | 2019-01-10 (AP) |