| 1. |
- Soltani Tehrani, Ali, 1982, et al.
(författare)
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A Comparative Analysis of the Complexity/Accuracy Tradeoff in Power Amplifier Behavioral Models
- 2010
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Ingår i: IEEE transactions on microwave theory and techniques. - 0018-9480 .- 1557-9670. ; 58:6, s. 1510-1520
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Tidskriftsartikel (refereegranskat)abstract
- A comparative study of state-of-the-art behavioral models for microwave power amplifiers (PAs) is presented in this paper. After establishing a proper definition for accuracy and complexity for PA behavioral models, a short description on various behavioral models is presented. The main focus of this paper is on the modeling accuracy as a function of computational complexity. Data is collected from measurements on two PAs-a general-purpose amplifier and a Doherty PA designed for WiMAX-for different output power levels. The models are characterized in terms of accuracy and complexity for both in-band and out-of-band error. The results show that, among the models studied, the generalized memory polynomial behavioral model has the best tradeoff for accuracy versus complexity for both PAs, and can obtain high performance at half of the computational cost of all other models analyzed.
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| 2. |
- Afsar Doost, Sepideh, 1983, et al.
(författare)
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Digital Predistortion Using a Vector Switched Model
- 2012
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Ingår i: IEEE Transactions on Microwave Theory and Techniques. - 0018-9480 .- 1557-9670. ; 60:4, s. 1166-1174
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Tidskriftsartikel (refereegranskat)abstract
- Abstract—A switched behavioral model considering memory effects with special focus on ”difficult” amplifier architectures is proposed in this paper. The proposed model is shown to be very simple and linearly identifiable. A digital predistorter based on the proposed model is implemented for a 100–W, 2.6 GHz Doherty power amplifier that has been considered difficult in other reports, and it is shown that the proposed model can succesfully linearize the amplifier. In particular, the proposed model and the digital predistorter is shown to outperform other state-of-the-art models and digital predistorers in terms of computational complexity for a given desired accuracy.
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| 3. |
- Afsar Doost, Sepideh, 1983, et al.
(författare)
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Offline signature verification using geometric center features
- 2008
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Ingår i: 2008 9th International Conference on Signal Processing, ICSP 2008; Beijing; China; 26 October 2008 through 29 October 2008. - 9781424421794 ; , s. 1491-1494
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Konferensbidrag (refereegranskat)abstract
- A modified offline signal verification method based on geometric centre has been presented in this paper. The aim is to distinguish if a signature is forgery or original. The method is based on geometric center features. After vertical and horizontal splitting of figure around its geometric center, Euclidean distance model was used for classification and then algorithm based on diagonal splitting is presented too. The overall system performance is considered in term of well defined measure quantities.
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