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An unequally spaced linear array used in retrodirective array is proposed in this paper. The synthesis is carried out using Differential Evolution with Global and Local neighborhoods (DEGL) algorithm. A 16-element array with two layer antenna element is implemented to validate the numerical results. The simulation results show that the maximum sidelobe level is basically below -20 dB in the range...
A 3rd-order 3-bit single-loop ΔΣ modulator in fractional-N frequency synthesizer for UHF RFID Reader is optimized in terms of phase noise. Feed forward and feedback path structure is proposed in the ΔΣ modulator. The location of zeros and poles are placed at desired frequency for noise shaping by configuring feed forward and feedback coefficients. A fully integrated ΔΣ fractional-N frequency synthesizer...
A Ku broadband OMT for satellite communication applications is designed. This OMT consists of a stepped double ridged waveguide junction, a power combiner and an axial branch. It is similar to that of Bøifot junction, but has no septum and pins which increase the complexity of the structure. The OMT with a size of 42×44×100 mm3 can cover from 10.44 GHz to 14.93 GHz (35.4% bandwidth). The return losses...
Fractional Frequency Reuse (FFR) is one of the key concepts for enhancing cell-edge performance of OFDMA networks. Standard FFR allows one sub-band to be allocated for each cell. This limits the performance improvement of cell edge users, especially those bandwidth-sensitive users. With flexible sub-band allocation, cell edge can be allocated more than one sub-band, thereby performance can be improved...
Fractional frequency reuse (FFR) is one of the key concepts for interference mitigation in OFDMA networks. Previous work on FFR has focused on networks of relatively small size and standard hexagon-shaped cell layout. For real-life networks with very irregular cell layout and high variation in radio propagation, standard reuse schemes (e.g., reuse with a factor three) are inadequate; applying a standard...
We introduce mainly the design of LNA (low noise amplifier) using the theory of mismatch compensation. The design target is expanded and stability of transistor is analyzed through the K factor. Using the powerful function of the ADS (Advanced Design System) software, it introduces in detail the designing process of the desired amplifier. LNA with operating frequency from 20 MHz to 3 GHz is designed...
This paper describes initial research in addressing the challenges of managing quality of information for wireless sensor network target tracking with multiple missions of various priorities tracking multiple targets. We address the use of a distributed market-based mechanism to equalize the information value loss (that itself is a function of quality of information (QoI)) of tracked targets across...
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