| 1. |
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| 2. |
- Abedan Kondori, Farid, 1983-, et al.
(författare)
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Direct three-dimensional head pose estimation from Kinect-type sensors
- 2014
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Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 50:4, s. 268-270
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Tidskriftsartikel (refereegranskat)abstract
- A direct method for recovering three-dimensional (3D) head motion parameters from a sequence of range images acquired by Kinect sensors is presented. Based on the range images, a new version of the optical flow constraint equation is derived, which can be used to directly estimate 3D motion parameters without any need of imposing other constraints. Since all calculations with the new constraint equation are based on the range images, Z(x, y, t), the existing techniques and experiences developed and accumulated on the topic of motion from optical flow can be directly applied simply by treating the range images as normal intensity images I(x, y, t). In this reported work, it is demonstrated how to employ the new optical flow constraint equation to recover the 3D motion of a moving head from the sequences of range images, and furthermore, how to use an old trick to handle the case when the optical flow is large. It is shown, in the end, that the performance of the proposed approach is comparable with that of some of the state-of-the-art approaches that use range data to recover 3D motion parameters.
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| 3. |
- Alayon Glazunov, Andres
(författare)
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Maximum joint transmit-receive MRC gain with antennas exciting spherical vector wave modes up to order l
- 2012
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Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 48:24, s. 1520-1521
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Tidskriftsartikel (refereegranskat)abstract
- Derived is the maximum joint transmit and receive maximum ratio combining (MRC) diversity gain in arbitrary MIMO (multiple-input multiple-output) wireless propagation channels and the corresponding transmit and receive antenna coefficients. Also provided are numerical examples addressing two generic MIMO channel models based on the Kronecker correlation model with Laplacian angle-of-arrival (AoA) and angle-of-departure (AoD) distributions. In the analysis, spherical vector wave multipole modes of order l are considered, including both TE and TM modes.
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| 4. |
- ANDERSSON, MICHAEL, 1988, et al.
(författare)
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10 dB small-signal graphene FET amplifier
- 2012
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Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 48:14, s. 861-863
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Tidskriftsartikel (refereegranskat)abstract
- Reported is the realisation of a graphene FET microwave amplifier operating at 1 GHz, exhibiting a small-signal power gain of 10 dB and a noise figure of 6.4 dB. The amplifier utilises a matching inductor on the gate yielding a return loss of 20 dB. The design is optimised for maximum gain and the optimum noise figure is extracted by noise modelling and predicted to be close to 1 dB for the intrinsic graphene FET at this frequency. The presented results complement existing graphene FET applications and are promising for future graphene microwave circuits.
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| 5. |
- Arapan, Lilia, et al.
(författare)
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Thin film plate acoustic resonators for integrated microwave power oscillator applications
- 2011
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Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 47:7, s. 452-453
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Tidskriftsartikel (refereegranskat)abstract
- Two-port film plate acoustic resonators (FPAR) devices operating on the lowest order symmetric Lamb wave mode (S0) in C-oriented AlN membranes on Si were fabricated and tested for their power handling capabilities in a feedback-loop power oscillator circuit. The FPAR was operated at an incident power level of 24 dBm for several weeks without performance degradation. Its flicker noise constant was calculated from close-in phase noise data as αR=2.1×10^−36/Hz. The results indicate that IC-compatible S0 FPARs are well suited for integrated microwave oscillators with thermal noise floor (TNF) levels below −175 dBc/Hz.
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| 6. |
- Augustine, Robin, 1982-, et al.
(författare)
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Polymeric ferrite sheats for SAR reduction of Wearable ANtennas
- 2010
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Ingår i: Electronics Letters. - UK : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 46:3, s. 197-198
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Tidskriftsartikel (refereegranskat)abstract
- Reduction of specific absorption rate (SAR) has now become a buzz word because of the growing health concerns over microwave exposure. Ferrites are found to be effective in diminishing electromagnetic influence. In this reported work, flexible polymeric ferrite sheets are characterised on the basis of their shielding efficiencies. SAR measurements are carried out with a planar wearable antenna and polymeric ferrite shielding to confirm its competence.
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| 7. |
- Augustine, Robin, et al.
(författare)
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Relative permittivity measurements of Et-OH and Mt-OH mixtures for calibration standards in 1-15 GHz range
- 2014
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Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 50:5, s. 358-359
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Tidskriftsartikel (refereegranskat)abstract
- In open-ended coaxial dielectric characterisation techniques, intermediate liquid standards between air and water are necessary for precise dielectric measurements of biological samples. Calibration standards with dielectric permittivities much different from those of the measured samples will produce unreliable results. Different intermediate calibration standards are prepared and measurement results are presented. The aim is to obtain various permittivity values between 10 and 80 by diluting methanol and ethanol with distilled water. This technique can also be used for assessing the purity of alcohols.
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| 8. |
- Avolio, G., et al.
(författare)
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Identification technique of FET model based on vector nonlinear measurements
- 2011
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Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 47:24, s. 1323-U37
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Tidskriftsartikel (refereegranskat)abstract
- A new modelling approach which exploits only vector nonlinear measurements is described. The parameters of the I-V and Q-V nonlinear constitutive functions are identified by combining low-and high-frequency large-signal measurements with a numerical optimisation routine. Low-frequency dispersion manifesting in the I-V characteristics is also correctly accounted for. As a case study a gallium nitride HEMT on silicon carbide substrate is considered and very good agreement between measurements and simulation is achieved.
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| 9. |
- Berglund, Erik, et al.
(författare)
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Mapping between different kinematic structures without absolute positioning during operation
- 2012
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Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 48:18, s. 1110-1112
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Tidskriftsartikel (refereegranskat)abstract
- When creating datasets for modelling of human skills based on training examples from human motion, one can encounter the problem that the kinematics of the robot does not match the human kinematics. Presented is a simple method of bypassing the explicit modelling of the human kinematics based on a variant of the self-organising map (SOM) algorithm. While the literature contains instances of SOM-type algorithms used for dimension reduction, this reported work deals with the inverse problem: dimension increase, as we are going from 4 to 5 degrees of freedom.
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| 10. |
- Duong, Quang Trung, et al.
(författare)
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Cooperative spectrum sharing networks with AF relay and selection diversity
- 2011
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Ingår i: Electronics Letters. - : Institution of Engineering and Technology - IET. - 0013-5194 .- 1350-911X. ; 47:20, s. 1149-1151
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Tidskriftsartikel (refereegranskat)abstract
- The exact outage probability (OP) of cognitive dual-hop relay networks equipped with a single amplify-and-forward (AF) relay and a selection combining receiver at the destination is derived under spectrum sharing constraint on a primary user. The tractable closed-form OP readily enables evaluation of system performance, which indicates the significance of using a relay in cognitive radio networks with a spectrum sharing approach. The proposed analysis is validated by numerical examples.
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