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An optical ring resonator (ORR) based 1 × 4 integrated optical beamforming network (OBFN) targeting mmW is reported. The optimized true time delay response of a 3-ORR delay line with a bandwidth of 8.7 GHz was achieved over tuning range of 172.4 ps, which corresponds to a 31π phase shift for a 90 GHz signal. A 3 Gbps OOK NRZ data signal was transmitted through the delay line to verify the overall...
The near future 5G wireless/mobile communication systems may adopt 60-GHz millimeter waveband as one of main operating frequencies for its advantages of higher achievable transmission rate and wider available bandwidth, when compared with ones for 4G/3G/2G communication systems. In this paper, a novel structure design of microstrip antenna array working at the central frequency of 60-GHz waveband...
A zeroth-order resonance (ZOR) and first-order resonance (FOR) antenna based on the metamaterial is presented in this paper. The epsilon negative transmission line (ENG-TL) includes one meander line for realizing shunt inductance. The antenna is fed by an asymmetric co-planar waveguide (ACPW). The asymmetry of this structure brings about ZOR and FOR mode, which are merged into one passband to achieve...
Domestic grazing animals follow simple, scalable rules to assign themselves trajectories to cover a pasture. We explain how to adapt these rules for an information gathering system based on a realistic robot motion model and Kalmanfilter based evidence grid that accounts for both bandwidth and sensor limitations. Our results show that this algorithm can meet or exceed the performance of state of the...
In this paper we present a new cross-layer method for the routing problem in Wireless Mesh Networks taking into account the Quality of Service (QoS) with rate adaptation. Since different routing metrics play certain importance in the multihop routing, multiple objectives such as transmission delay, traffic load and bandwidth are incorporated to the routing metric. Meanwhile a new link-layer sensing...
A novel instrumentation amplifier (IA) is presented in this article. The proposed IA possesses improved performance in comparison with the common current conveyor-based IAs. It consists of two differential voltage current conveyors (DVCCs) and two resistors. The non-ideal effects of the active devices are discussed. Performances of the proposed circuit are confirmed through HSPICE simulation. The...
ISP network performance evaluation is very important to the improvement of application performance, the optimum competition of ISP network and the operation and management of Internet. ISP network consists of one or several autonomous systems (AS), so AS is chosen as a basic unit of performance evaluation. The performance measurement architecture of AS was put forward, and performance matrix model...
Bitstream extraction is an important issue in scalable video coding (SVC). In this paper, we propose an effective GOP-adaptive priority-based Rate-Distortion optimization extraction algorithm. The main feature of this scheme is being able to achieve the global optimal path. The extraction procedures, mainly including the calculation of PSNR and the allocation of priority, are carried out with Group...
In the imaging algorithms of Inverse Synthetic Aperture Sonar (ISAS), Range-Doppler Algorithm (RDA) and Polar Formation Algorithm (PFA) can be only suitable for far-field imaging. For obtaining near-field imaging, Computed Tomography Algorithm (CTA) is introduced. Five point-targets in near-field at different locations are imaged with RDA, PFA and CTA, respectively. Imaging results show that five...
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