| 1. |
- Ferreol, A., et al.
(författare)
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A New Expression of the Asymptotic Performances of Maximum Likelihood DOA Estimation Method With Modeling Errors
- 2004
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Ingår i: Proceeding EURASIP 2004, Vienna, Austria.. - 2219-5491. - 9783200001657 ; 06-10-September-2004, s. 2163-2166
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Konferensbidrag (refereegranskat)abstract
- This paper provides a new analytic expression of the RMS (Root Mean Square) error and bias of the Maximum Likelihood (ML) Direction Of Arrival (DOA) estimator in the presence of steering vectors modeling errors. The reference [4] proposes a first order approximation of these performances which is adapted to small modeling errors. In order to take into account larger modeling errors and provide tools for designing experimental set-up, a more accurate and easily usable derivation of these performances is necessary For such an investigation, the DOA estimation errors are written as an hermitean form with a stochastic vector composed by the modeling errors. Finally, a closed form expression between the performances (bias and RMS error) and statistical moments of the model error are deduced from the statistics of the hermitean form. Simulations confirm the theoretical results.
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| 2. |
- Klang, Göran, et al.
(författare)
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Interference Rejection in Systems Employing Transmit Diversity
- 2002
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Ingår i: European Signal Processing Conference. - : EUSIPCO. - 2219-5491.
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Tidskriftsartikel (refereegranskat)abstract
- Space diversity methods provide excellent means for increasing the robustness against interference and noise in communication systems. This is well known for systems using multiple receive antennas and it holdsforsystems applying transmit diversity as well. In fact, the use of transmit diversity provide two independent means for reducing the impact of interference. Via the diversity gain and via the code rate, both related to the underlying space-time code. In this paper, we are considering the use of space diversity methods in conjunction with interference rejection combining (IRC) to mitigate the impact of interference and noise for interference limited scenarios. Transmit diversity schemes based on space-time block codes (STBC) are assumed. We elucidate the importance of taking into account the spatio-temporal correlation induced by cochannel users employing transmit diversity. A novel space-time IRC (STIRC) scheme is proposed to handle the problem. The STIRC scheme combines the simplicity of conventional IRC while taking the structure of interfering users into account. Simulation examples demonstrate significant gains compared to the use of conventional IRC.
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| 3. |
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| 4. |
- Saliu, Sokol
(författare)
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Definition of instantaneous frequency on real signals
- 2000
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Ingår i: European Signal Processing Conference. - 2219-5491. ; 2015-March:March
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Konferensbidrag (refereegranskat)abstract
- This paper introduces a definition of the instantaneous frequency (IF) on real signals. Basically the definition ωt = xt/√1 - x2t avoids some pitfalls associated with the corresponding definition on analytic signals. It readily applies to the class of monocomponent frequency modulated signals and also accommodates the class of amplitude and frequency modulated signals. An interpretation of the IF is given for the latter and an extension of it to instantaneous parameters is discussed.
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| 5. |
- Völcker, Björn, et al.
(författare)
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Optimizing Correlation Based Frequency Estimators
- 2002
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Ingår i: European Signal Processing Conference. - : EUSIPCO. - 2219-5491.
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Tidskriftsartikel (refereegranskat)abstract
- As a complement to the periodogram, low-complexity frequency estimators are of interest. One such estimator is based on Prony's method and rely on phase information of the auto-correlations. Both performance and computational complexity are functions of the choice of correlations used in the estimator and often we have a trade off situation. In this paper, frequency estimation from an arbitrary set of estimated auto-correlations is studied. We further introduce a design strategy by optimizing a performance criterion given a predetermined computational constraint. We illustrate this by numerical examples.
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