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In this paper, we consider an uncoded cooperative relaying system using an adaptive decode-and-forward (ADF) protocol. Unlike many existing works that adopt single-symbol transmissions, we assume more reasonable frame transmissions here. The primary focus of this paper is on the performance aspects, aiming to offer important theoretical guidance to system designers. Specifically, we derive an accurate...
A high-gain silicon based on-chip dielectric resonator antenna operating at 60GHz that can be fabricated with standard CMOS technology is proposed. Both the dominant mode and one high-order mode are excited in the rectangular DRA realizing broadband characteristic. The simulated impedance bandwidth is about 17.3% (54.9–65.3GHz), covering the 7GHz band license-free around 60GHz. The proposed antenna...
This paper presents a game-theoretical approach to provide a framework for optimal template selection in image prediction. Image prediction is an effective tool for coding still images and intra pictures in videos. Template matching algorithms which use neighboring blocks of the prediction target as templates have been widely used for image prediction. The assumption of these approaches is that the...
A high gain hybrid monopole-dielectric resonator antenna is introduced. By loading a half-ring-shaped dielectric resonator over a monopole element in the vertical plane, two high-order modes are excited in the DR together with the self resonance of the monopole antenna. The achieved −10dB impedance bandwidth is 25%, covering the frequency range of 5.88 to 7.58 GHz. The simulated gain is about 7.3...
In this paper, a novel dielectric resonator antenna resonating at 3.46 GHz is presented. From simulated results, it has been confirmed that the mode TExδ01 has been excited inside the proposed DRA. Since the uniform field distribution over the main radiating aperture, this design has about 5.83 dB gain at θ = 0°. Meanwhile, the ceramic DR is located only 3mm above the ground plane and still shown...
A rectangular dielectric resonator antenna (DRA) with TExδ01 mode is proposed in this paper. Since the uniform field distribution over the main radiating aperture, it has about 6.68 dB gain at θ=0°. The designed antenna is fed at the upper side that has the potential to integrate with chip in millimeter-wave frequency band.
This paper presents a low-power down-conversion mixer for 3.1~4.8 GHz MB-OFDM UWB applications. The proposed mixer is based on folded double-balanced Gilbert cell and employs following techniques: two cross-coupling capacitors at the transconductance stage enhance conversion gain and reduce input noise; two choke inductors reduce flicker noise from the switch quad; tuning capacitors and resistors...
This paper describes a design of an inductor-less variable gain amplifier (VGA) for UWB systems in a standard digital 0.18 ??m CMOS technology. The VGA is implemented using four-stage modified Cherry-Hopper amplifier, and by changing the value of the feedback resistors in the Cherry-Hopper amplifiers, a variable gain from -17.4 dB to 52.7 dB can be obtained. The DC offset is reduced effectively by...
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