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An interference monitoring station is presented which detects, characterises and logs interference events. The system operates autonomously and continuously over multiple global navigation satellite system (GNSS) bands. With a bandwidth of up to 80 MHz, input resolution of 8 bit an overall data rate of approximately 1.3 Gbit/s can be supported. The interference detection is carried out in real-time,...
In this paper, a compact quasi-isotropic antenna with enhanced bandwidth for radio frequency (RF) energy harvesting applications is presented. The quasi-isotropic pattern is achieved using split ring resonators (SRRs) and the folded dipole structure. Two folded split ring resonators (FSRRs) are implemented orthogonally to reduce the mutual coupling, and each resonance is placed closely to widen the...
This paper documents development and basic testing of an asymmetric FHSS network. Asymmetric in a way that the network HUB or master consumes a lot of power, while the peripherals or slaves consume as little power as possible. To achieve good consumption, the input only sensors are sleeping most of the time and quickly synchronize into the FHSS scheme upon an event. The main idea explored in this...
This paper work is about a transimpedance amplifier which have very high gain and sensitivity designed using cadence CMOS 0.18 μm technology with supply voltage of 1.8 V dissipates power 43μW suitable for current sensing signals from a sensor, molecular and nanodevice system. The integrator based circuit followed by an ADC. Because of the ability to handle large standing currents, the circuit is competent...
The incoming 5G revolution will dramatically increase the design complexity for handsets and communication infrastructures, demanding the RFIC and ASIC chipsets designers, network and system components vendors and telecom operators to provide viable 5G E2E (End-to-End) products and solutions before A.D. 2020. The broadband modulation bandwidth for RF transmitters (i.e., 250 MHz to above 1 GHz), stringent...
Recent broadcast standards support Layered Division Multiplexing (LDM) to achieve graceful degradation as signal quality degrades at the receiver. LDM is accomplished by using different constellations within the same Radio Frequency (RF) spectrum. LDM thus enables delivering multiple service tiers in a single broadcast channel. LDM when used in conjunction with scalable source coding codecs such as...
Carrier aggregation supports an increased total bandwidth, data rate and utilization of available fragmented spectrum, where the latter is a core component of next generation Wi-Fi and Cellular networks, including 5G. Wireless communications receivers with intra-band non-contiguous CA, employing conventional complex mixers and base-band circuitry, are desirable, however risks of VCO injection pulling...
Unutilized spectrum, i.e. spectrum holes, are opportunities that may be used for communication or other RF services. In this paper, we explore adversarial attacks that reduce the size of spectrum holes by showing their advantage compared to a random jammer. Using a game-theoretical approach, we design an optimal scanning strategy that provides an increased probability of detecting such an attack....
This paper presents a low cost OFDM based channel sounding technique which can be implemented on a low power embedded system. The technique is first used to measure the channel of an indoor environment and is validated by comparison with a VNA and a ray-tracing simulator. We then show its usage in two interesting situations. Finally, we conclude the paper by giving the advantages and drawbacks of...
Flight inspection of radio-based terrestrial navigation systems is crucial for sufficient accuracy. Especially in proximity of wind turbines (WT), which have arisen in recent years due to government subsidies for renewable energies, flight inspections must be carried out. This causes problems that hinder the usage of conventional aircraft: Even rotorcraft (e.g. helicopters) require a certain amount...
This paper discusses the influence of non-idealities in the analog transmit and receive frontend of an MMIC-based 300 GHz wireless link on the receive signal quality. The degradation of EVM due to limited bandwidth and gain imbalance in the quadrature up- and down-converters is considered and compared to experimentally achieved data. Using adaptive equalization and quadrature error correction in the...
At L-band the most practical implementation of space borne SAR antennas requires the use of microstrip radiating elements. However, printed antennas are usually characterized by inherently narrow bandwidth which limits the range resolution capability of the system. In order to develop an L-band SAR antenna design with enhanced bandwidth performance Spar and CAL have performed studies aimed at 5% (1...
Full-duplex (FD) radio communication potentially doubles the spectral efficiency in the densely occupied RF spectrum (100MHz to 5GHz). However, significant challenges remain, particularly the presence of a strong transmitter (TX) self-interference (SI) coupling to the receiver (RX). Numerous recent efforts on mitigating SI have focused on using active cancellation techniques [1–5]. However, these...
The 60GHz carrier with 9GHz bandwidth enables ultra-high-speed wireless communication in recent years [1–4]. To meet the demand from rapidly-increasing data traffic, the IEEE802.11ay standard is one of the most promising candidates aiming for 100Gb/s data-rate. Both higher-order digital modulation such as 128QAM and channel bonding at 60GHz are considered to be used in the IEEE802.11ay standard. However,...
Wake-up receivers (WuRXs) are low-power radios that continuously monitor the RF environment to wake up a higher-power radio upon detection of a predetermined RF signature. Prior-art WuRXs have 100s of kHz of bandwidth [1] with low signature-to-wake-up-signal latency to help synchronize communication amongst nominally asynchronous wireless devices. However, applications such as unattended ground sensors...
The loop bandwidth of conventional RF fractional-N synthesizers has been limited to about fREF/10 despite the use of methods that suppress the ΔΣ-modulator quantization noise [1–4]. The trade-off between the loop bandwidth and the ΔΣ noise peaking becomes more serious if the synthesizer employs a ring oscillator to achieve multiband operation, less unwanted coupling, and greater design flexibility...
Ultra-narrow-band (UNB) signaling is an enabling technology for low-power wide-area (LPWA) networks for the “Internet-of-Things”. Indeed, UNB signaling, based on spectrally efficient modulations such as DBPSK, simultaneously optimizes network capacity while maximizing the communication link budget. However, UNB signaling poses many technical challenges. In the receiver, carrier frequency offsets (CFO)...
The evolving trend for increasing data rates in cellular communication systems with limited and fragmented frequency spectrum requires enhanced spectral efficiency of today's and future communication standards. The resulting need for high-order modulation schemes with large peak-to-average power ratio results in stringent requirements on in-channel linearity and SNR. At the same time FDD operation...
Multifunction RF systems which can operate with different RF functions like radar, communication and electronic warfare offer a variety of benefits beyond the well-known AESA (Active Electronically Steerable Antenna) features. To reach a sufficient technology maturity to start product development a series of challenges most stemming from the large required operation bandwidth have to be resolved....
This paper introduces a novel architectural design for wideband spaceborne Earth Observation Synthetic Aperture Radars (SAR). In particular the paper is focused on an innovative architecture conceived for the transmission chain of the internal electronics of the radar. The presented solution has been developed in the frame of the program “COSMO - SkyMed di Seconda Generazione” (CSG), to address challenging...
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