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.
This paper presents the design and implementation of a low power, wideband and high sensitivity CMOS power detector in 130 nm standard CMOS technology. It utilises a travelling-wave structure to achieve wideband input matching bandwidth from 7 GHz to more than 70 GHz. By biasing the power detectors in subthreshold regime, it achieves a measured peak voltage sensitivity of 75 dB at 7 GHz while maintaining...
Ambient backscatter is an emerging technology that utilizes the surrounding radio frequency (RF) signals such as digital digital television (TV) broadcasting, cellular or Wireless-Fidelity (Wi-Fi) to enable batteryless devices to communicate with each other. One open problem for ambient backscatter is channel capacity. In this paper, we investigate the capacity problem of an ambient backscatter communication...
This paper considers a multiuser massive multiple-input multiple-output (MIMO) uplink transmission with the help of an Nr-antenna amplify-and-forward (AF) relay. Assume that the base station (BS) is equipped with a large array of Nd antennas but supported by a far smaller number, K, of radio-frequency (RF) chains, which greatly reduce hardware complexity and cost. A hybrid processing is proposed to...
Characteristics of semiconductor diodes as power indicators are studied. Rigorous electromagnetic model of direct problem of average detection is derived. Approximate models of the inverse problem for detector characteristic are proposed. Maximum errors of approximation for different orders of approximating polynomial and source resistance are calculated.
This paper describes a supply modulator for RF power amplifier capable of average-power-tracking (APT) mode and envelope-tracking (ET) mode. The supply modulator uses single controller and switched power stage for both modes and realizes short transitions of less than 10 μs, a required feature for air interface standards specified by 3GPP, such as LTE and 5G. Furthermore, the integrator-less controller...
The SCA instrument is a C-band wind scatterometer that forms part of the EUMETSAT Polar System Second Generation (EPS-SG) mission. The paper presents an overview on the current development status of the SCA instrument and of its key equipment.
Photonic-electronic integration is a key technology to master data traffic growth and therefore an enabler of future network technologies. For some time now, a novel silicon-based photonic-electronic integration technology, photonic BiCMOS, is under development at IHP. Photonic BiCMOS is a planar technology co-integrating monolithically on a single substrate high-speed RF frontend electronics - by...
One of the most important issues that define the quality of life is the security and security of the people against the current threats mainly coming from terrorism. Traffic with narcotics and the irresponsible consumption of some drugs are also serious problems for humanity. The science and technology is on the permanent race to help authorities combat illegal activities such as explosives and narcotics...
Ambient backscatter is a new technology that utilizes existing wireless signals of other communication systems to enable small devices to communicate with each other. One key problem for ambient backscatter is that if it will result in interference on existing communication systems. We investigate this problem in this paper. Specifically, we build up the theoretical system model for the ambient backscatter...
This paper proposes a successive interference cancellation (SIC) of independent component analysis (ICA) based spatial division multiple access (SDMA) differential detector for Bluetooth low energy (BLE) systems. Typical SDMA scheme requires estimations of channel state information (CSI) using orthogonal pilot sequences. However, the orthogonal pilot is not embedded in the BLE packet. This fact motivates...
In a spectrally congested environment or a spectrally contested environment which often occurs in cyber security applications, multiple signals are often mixed together with significant overlap in spectrum. This makes the signal detection and parameter estimation task very challenging. In our previous work, we have demonstrated the feasibility of using a second order spectrum correlation function...
In this paper, we present a drone dual-frequency technique in order to detect thick oil slicks in ocean. From physical point of view, the problem is considered to be a multi-layers wave surface scattering model where we study the reflection of the electromagnetic (EM) waves from the sea layer covered by oil layer. The electrical properties and the physical characteristics are defined for the layers...
Due to the observed increasing scarcity of economically usable spectrum, it is becoming difficult to accommodate the data demand of countless mobile data terminals into existing bands. The TV White spaces, the scarcely used bands of former analog TV broadcasting, could be a viable option to alleviate this problem. The concept of Cognitive Radio must be employed though, as primary users within the...
This paper describes a wide dynamic-range and accurate complex-impedance detector for adaptive power amplifier load tuning systems. The detector IC, fabricated in a 130 nm SOI technology, consumes 7mA under 2.5V supply voltage. It can handle LTE signals with an input power from 0 dBm up to 40 dBm thanks to its variable attenuator system. System level measurements show that the detector has a very...
In this study, we propose an ultra-fast compliance current circuit for ReRAM electrical characterization. The circuit utilizes high speed components with low propagation delay and can reduce the overall response time to nanosecond level. Both simulated and measured results demonstrate that our proposed compliance current circuit possesses response time of ∼100ns, and thus can effectively reduce the...
A wideband large dynamic range RF logarithmic power detector is presented in this work. The power detector is realized as a successive detection logarithmic amplifier and is fabricated using SiGe BiCMOS technology. The detector has a dynamic range of 64 dB and a sensitivity of −56 dBm at the center frequency of 1.5 GHz when considering a ± 1 dB error range. For the same error range, the dynamic range...
In this paper, we propose an analog phase shifter aided spatial modulation scheme. The proposed scheme is able to send more spatial symbols than conventional spatial modulation (SM), while reserving the low complexity of single RF-chain MIMO structure. The main idea is to transmit Nt different phase-shifted copies of the digitally modulated signal through Nt antennas. In each time slot, the transmitted...
Residual self-interference cancellation is an important practical requirement for realizing the full potential of full-duplex (FD) communication. Traditionally, the residual self-interference is cancelled via digital processing at the baseband, which requires accurate knowledge of channel estimates of the desired and self-interference channels. In this work, we consider point-to-point FD communication...
In ambient backscatter communications (Am-BC), a backscatter device can harvest power from ambient RF signals and modulate its information symbols over the ambient carriers without using complex RF transmitter. Conventional receiver design for AmBC focuses on tackling the direct link interference from the RF source. In this paper, a novel receiver, which is called cooperative receiver, is proposed...
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...
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.