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| Presentation | 2008-06-27 13:50 Avoidance of Numerical Unstability in Exact Unconditional ML Estimation of DOA Haihua Chen, Masakiyo Suzuki (Kitami Inst. of Tech.)  CAS2008-29 VLD2008-42 SIP2008-63 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | This paper addresses the issue of numerical unstability in Unconditional Maximum Likelihood (UML) estimation of Directions-of-Arrival (DOA) finding. First we show brief description of the definition of the exact UML estimation and the conventional method solving it, Alternating Minimization (AM) method. The exact UML criterion is formulated by using orthonormal bases of the signal and noise subspaces. When more than one directional parameters have an identical value, the dimension of the signal subspace decreases. In other words, in the parameter space the change of each subspace is discontinuous at the points that more than one parameters have the identical value. As a result, when more than one directional parameters converge to an identical value, the calculation of the bases of these two subspaces becomes numerically unstable. In this paper, we propose a technique which eliminates the discontinuance with respect to the change of the noise subspace to make the UML estimation numerically stable. Finally, simulation results are also shown to demonstrate the validity of the proposed technique. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | DOA finding / Stochastic signal model / ML / Numerical unstability / Discontinuance of subspace / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 108, no. 109, SIP2008-63, pp. 61-66, June 2008. | |
| Paper # | SIP2008-63 | |
| Date of Issue | 2008-06-20 (CAS, VLD, SIP) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | CAS2008-29 VLD2008-42 SIP2008-63 |
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| Conference Information | |
| Committee | VLD CAS SIP |
| Conference Date | 2008-06-26 - 2008-06-27 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Hokkaido Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | SIP |
| Conference Code | 2008-06-VLD-CAS-SIP |
| Language | English |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Avoidance of Numerical Unstability in Exact Unconditional ML Estimation of DOA |
| Sub Title (in English) | |
| Keyword(1) | DOA finding |
| Keyword(2) | Stochastic signal model |
| Keyword(3) | ML |
| Keyword(4) | Numerical unstability |
| Keyword(5) | Discontinuance of subspace |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Haihua Chen |
| 1st Author's Affiliation | Kitami Institute of Technology (Kitami Inst. of Tech.) |
| 2nd Author's Name | Masakiyo Suzuki |
| 2nd Author's Affiliation | Kitami Institute of Technology (Kitami Inst. of Tech.) |
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| Speaker | Author-1 |
| Date Time | 2008-06-27 13:50:00 |
| Presentation Time | 20 minutes |
| Registration for | SIP |
| Paper # | CAS2008-29, VLD2008-42, SIP2008-63 |
| Volume (vol) | vol.108 |
| Number (no) | no.105(CAS), no.107(VLD), no.109(SIP) |
| Page | pp.61-66 |
| #Pages | 6 |
| Date of Issue | 2008-06-20 (CAS, VLD, SIP) |
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