The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Deploying a large number of sensing buoys is a powerful tool for oceanographic, marine biology and climate change research. In this work we address the problem of efficient data collection by a team of Unmanned Aerial Vehicles (UAV) from low-power, small buoys with previously unknown locations in complex coastal or remote oceanic regions with aerial restrictions. To tackle this problem we propose...
This paper proposes a fully integrated 5–12 GHz power mixer in tsmcTM 1P6M 0.18 μm CMOS technology. The power mixer is used to replace the conventional mixer and power amplifier (PA). The circuit consists of an up-conversion Gilbertcell mixer and a wideband and low loss 1:4 Guanella-type differential transmission-line-transformer (DTLT). The power mixer is biased at deep class A/B under a 3.5-V supply...
Photonic systems are being increasingly designed for multi-functional, distributed avionic platforms to satisfy the next-generation military needs [1]. This approach requires establishing high-capacity, Free-Space Optical (FSO) communication networks that connect a variety of mobile and aerial platforms in an ad-hoc fashion [2]. Traditional design methodology, that addresses a specific scenario with...
In this paper, we present a Programmable SoC device with monolithically integrated RF-ADCs and RF-DACs in a 16nm FinFET process. The device includes quad ARM Cortex-53 and dual ARM Cortex-R5 processing subsystem, 750K programmable logic cells, 4000 DSP slices and 4 32Gb/s serial transceivers. Each 14-bit RF-DAC operates at a sample rate of up to 6.4GS/s and can directly synthesize RF carriers up to...
For super-regenerative oscillators (SRO), a principal component that determines several aspects of the system response is the quench signal generation. The high oscillation frequency of mm-wave SROs enables fast quench rates that could well exceed 10 GHz. This is desirable because higher symbol rates and, consequently, higher communication data rates could be achieved. This work presents a limiting...
This paper demonstrates a wideband, subharmonic down converting mixer using a commercial 130-nm SiGe-BiCMOS technology. The mixer adopts a frequency doubling LO-stage, a differential switched-transconductance RF-stage, on-chip LO and RF baluns, and two emitter-follower buffer-stages. The measured results exhibit a maximum conversion gain up to 2.6 dB over the frequency range of 100 to 140 GHz with...
Advanced cellular and wireless standards are rapidly expanding their instantaneous RF bandwidth requirements, and with operating frequencies moving into the mmWave spectrum, channels of 1 GHz and wider become increasingly likely. Furthermore, carrier aggregation and MIMO systems require multiple wideband channels, placing even higher demands on the system. No longer satisfied with short bursts of...
A quad-band energy harvester is proposed here. The harvester is formed of rectifiers and matching circuits at different frequency bands: GSM-900 (890-960 MHz), GSM-1800 (1800-1870 MHz), ISM 2.45 GHz (2.45-2.457 GHz) and LTE-band 7 (2.6-2.67 GHz). The harvester is formed of two dual-band matching circuits and two rectifiers instead of the conventional design with four single-band matching circuits...
RF self-interference cancellation for Full-Duplex communication with a microwave photonic technique is proposed and demonstrated experimentally. It is based on an integrated dual-parallel Mach-Zehnder modulator (DP-MZM), where the sub-MZMs (MZM1 and MZM2) are biased at the quadrature point and the minimum point, respectively. It avoids the optical interference at the combining Y branch waveguide....
The application of high-count multi carrier optical sources (i.e. frequency combs) in real-time microwave/millimeter wave signal processing is discussed. The multi heterodyne sensing and classification of up to 110 GHz-wide radio frequency (RF) signals using two set of optical frequency combs is demonstrated.
We propose and demonstrate a new and extremely simple concept of reconfigurable photonic generation of arbitrary RF waveforms, based on a single CW laser and a frequency shifting loop. Our system does not require broadband light source or fast electronic generator. It is capable of generating arbitrary RF waveforms with duration ranging from 1 ns to more than 100 ns, and with dynamic performances...
In this work we propose and experimentally demonstrate a photonics-assisted microwave spectral scanning system that realizes high-speed sweep over ultra-broad bandwidth. Enabled by coherent dual electro-optical frequency combs and a recirculating optical frequency shifter, the proof-of-concept experimental setup covers the frequency range from ∼ 1 to 8 GHz with 1.2 MHz spectral resolution within 14...
Bandwidth limitation of current wireless frequency bands and the energy consumption are challenges that have to be addressed by future 5G wireless networks. The millimeter wave (mm-wave) spectrum, spanning 30 GHz to 300 GHz, is a prime candidate to resolve the bandwidth limitation issue in future networks. High-speed electronics, though, are quite energy-inefficient for such mm-wave signal generation...
This paper evaluates the link-level performance of millimeter wave (mmWave) wireless communication system operating on 39.5 GHz frequency band. A frame structure based on the long term evolution (LTE) is proposed, including resource allocation and reference signal pattern. Some key parameters are carefully set to adapt to the mmWave frequency. Simulation results validate that the performance of mmWave...
We propose a novel integration based technique employing a cascaded pair of microring resonators on silicon-on-insulator (SOI) platform for achieving a tunable single passband microwave photonic filter (SPMPF). A double microring structure is used to provide an all-integration approach to eliminate the usual selectivity dependence of the radio frequency (RF) response on the shape of a single ring...
We report on a photonic downsampling receiver architecture for millimeter-wave communication systems. Conversion loss advantage of >16 dB is shown compared to modulator-based photonic downconversion. 3 Gb/s millimeter-wave communication system performance is demonstrated.
We demonstrate evanescently-coupled waveguide modified uni-traveling-carrier (MUTC) photodiodes with more than 105 GHz bandwidth. The photodiodes have dark currents as low as nA and deliver RF output powers of 5.1 dBm, 4.4 dBm and 3.5 dBm at 75 GHz, 80 GHz and 90GHz, respectively.
We demonstrate a novel technique for the generation of fully-reconfigurable radio frequency chirped waveforms with extremely simple hardware based on a single CW laser and a frequency-shifting loop. All the waveform parameters, namely sign and value of the chirp rate, bandwidth, repetition rate and chirp duration are fully reconfigurable by simply tuning the frequency of a MHz-range single RF tone...
In this study, we introduce an efficient dual-band polar transmitter architecture to reduce the required bandwidth of phase-modulated signal for polar transmitter. We derive a time-domain expression of dual-band band-pass signal, and show comparison of receiving signal-to-noise performance between the conventional polar transmitter and the proposed scheme. Simulation results show two-stage digital...
Cognitive radio network (CRN) is regarded as an emerging technology for better spectrum efficiency where unlicensed secondary users (SUs) sense RF spectrum to find idle channels and access them opportunistically without causing any harmful interference to licensed primary users (PUs). However, RF spectrum sensing and sharing along with reconfigurable capabilities of SUs bring severe security vulnerabilities...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.