Maximum likelihood DOA estimation in unknown colored noise fields
Li, M. and Lu, Y. (2008) Maximum likelihood DOA estimation in unknown colored noise fields. IEEE Transactions on Aerospace and Electronic Systems, 44 (3). pp. 1079-1090. ISSN 0018-9251 (https://doi.org/10.1109/TAES.2008.4655365)
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Direction-of-arrival (DOA) estimation in unknown noise environments is an important but challenging problem. Several methods based on maximum likelihood (ML) criteria and parameterization of signals or noise covariances have been established. Generally, to obtain the exact ML (EML) solutions, the DOAs must be jointly estimated along with other noise or signal parameters by optimizing a complicated nonlinear function over a high-dimensional problem space. Although the computation complexity can be reduced via derivation of suboptimal approximate ML (AML) functions using large sample assumption or least square criteria, nevertheless the AML estimators still require multi-dimensional search and the accuracy is lost to some extent. A particle swarm optimization (PSO) based solution is proposed here to compute the EML functions and explore the potential superior performances. A key characteristic of PSO is that the algorithm itself is highly robust yet remarkably simple to implement, while processing similar capabilities as other evolutionary algorithms such as the genetic algorithm (GA). Simulation results confirm the advantage of paring PSO with EML, and the PSO-EML estimator is shown to significantly outperform AML-based techniques in various scenarios at less computational costs.
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Item type: Article ID code: 14692 Dates: DateEventJuly 2008PublishedSubjects: Technology > Electrical engineering. Electronics Nuclear engineering Department: Faculty of Engineering > Electronic and Electrical Engineering Depositing user: Strathprints Administrator Date deposited: 01 Jul 2010 11:06 Last modified: 08 Apr 2024 17:04 URI: https://strathprints.strath.ac.uk/id/eprint/14692