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.
Recent research and development of hardware architectures and technologies over MHz-through-THz frequency range have generated a significant momentum for future wireless applications. This leap forward is being propelled by the organic fusion of multiple functional and multiple dimensional transceiver integration based on multiple technologies through heterogeneous materials and innovative processes...
In this paper, we investigate the downlink of millimeter-wave multi-user massive MIMO systems, and propose a hybrid precoding scheme based on a sub-array architecture to achieve a better compromise between hardware cost and system performance. The proposed precoding scheme performs analog precoding and digital precoding at the transmitter with the generalized sub-array architecture. It implements...
We have designed and implemented an ultrasonic imaging research platform that performs all signal processing, including beamforming and image processing, using software on a GPU. An operating software is developed on a PC that can control RF data acquisition hardware to accommodate ultrasound images of various formats. Beamforming methods that include conventional scan line based imaging, scan line-based...
The rising adaption of Internet of Things (IoT) and Industry 4.0 is expected to boost the demands of spatially distributed embedded wireless networks. For an efficient design flow of reliable wireless communication protocol implementations, it is essential to have a testing environment, which is continuous, simple and automated at various levels in the development life cycle. This paper presents an...
Unlike most currently available localization systems, tagless localization technologies do not require a target to wear a passive or active hardware device. Radio Tomographic Imaging (RTI) is one such technique, which operates based on the use of a tomographic radio frequency (RF) sensor network. The majority of RTI-systems communicate using a single frequency band: 2.4 GHz. The use of sub-1 GHz frequencies...
This paper presents a new approach to approximate various complex arithmetic functions for applications in wideband RF transceivers by using stochastic computing based on the piecewise linear (PWL) approximation. The optimized design parameters for PWL approximation are chosen by an optimization algorithm targeting the best tradeoff between hardware complexity and approximation accuracy. Then, this...
Massive multiple-input multiple-output (MIMO) is an emerging technology for future wireless networks, scaling up conventional MIMO to an unprecedented number of antennas at base stations. Such a large antenna array has the potential to make the system achieve high channel capacity and spectral efficiency, but it also leads to high cost in terms of hardware complexity. In this paper, we consider a...
Based on a workshop developed at INICTEL-UNI, this paper presents the methodology and considerations taken to improve the experiences in communication laboratory sessions in Peruvian universities with Software Defined Radio platforms, using a HackRF-One for transmission and a RTL-SDR for reception together with GNUradio Companion, an open source software. The use of these tools allows real communications...
A collaborative effort between University of Washington, Shared Spectrum Company and Daintree Technologies is resulting in the first metro-scale spectrum observatory - CityScape. In this work, we provide an overview of the system architecture (both hardware and software components), the novel features that distinguish this from others and the design and operational challenges encountered. For further...
Software defined radio (SDR) is a rapidly developing technology that implements signal processing components partially or completely in software. In this paper, SDR's potential as a platform for ground-penetrating radar (GPR) is explored. The stepped-frequency radar method is implemented using off-the-shelf SDR hardware and open-source software. SDR is typically designed for communications applications,...
This paper proposes to exploit the so-called {\it reciprocity parameters} (modelling non-reciprocal communication hardware) to use them as decision metric for binary hypothesis testing based authentication framework at a receiver node Bob. Specifically, Bob first learns the reciprocity parameters of the legitimate sender Alice via initial training. Then, during the test phase, Bob first obtains a...
An adaptive (or cognitive) radar operates by sensing the environment and accordingly adopts an optimal transmit-receive structure. To this end, in the literature, matched illumination (MI) principles have been investigated to realize this concept, algorithms have been developed for the different components in such radars, and the entire framework validated through numerical simulations. However, these...
This paper explores an interleaving approach to expand the effective sampling rate of analog-to-digital converters (ADCs) with application to power amplifier characterization and digital pre-distortion. By interleaving a known test signal, it is shown that a 250 MSPS ADC can be used to effectively sample at 2 GSPS, providing 1 GHz of observational bandwidth. A 200 MHz “stretched” LTE signal is then...
Wirelessly networked systems of implantable medical devices endowed with sensors and actuators will be the basis of many innovative, sometimes revolutionary therapies. The biggest obstacle in realizing this vision of networked implantable devices is posed by the dielectric nature of the human body, which strongly attenuates radio-frequency (RF) electromagnetic waves. In this paper we present the first...
Bilateral filtering (BLF) and median filtering (MF) are key components in many applications. As the image resolution grows rapidly, implementation of efficient filtering is highly demanded. In this paper, we present a unified VLSI architecture that is able to compute both kinds of filters for 4k2k videos at 30fps. One feature of this design is that we leverage an emerging layer-based algorithm for...
In millimeter wave (mmWave) communication, analog and hybrid beamforming systems are proposed to reduce the number of RF chains when a large antenna array is utilized to achieve a high beamforming gain. In this paper, a new transmission scheme is first proposed by leveraging the hardware architecture of analog and hybrid beamforming to improve the spectral efficiency. The new scheme is called spatial...
Incorporating full duplex operation in Multiple Input Multiple Output (MIMO) systems provides the potential of boosting throughput performance. However, the hardware complexity of the analog self-interference canceller scales with the number of transmit and receive antennas, thus exploiting the benefits of analog cancellation becomes impractical for full duplex MIMO transceivers. In this paper, we...
Millimeter wave (mm-wave) communication is a topic of intensive recent study, as it allows to significantly boost data rates of future 5G networks. In this paper, we focus on a mm-wave system consisting of a single Access Point (AP) and two User Equipments (UEs), where one UE requires high throughput, while the other is characterized by a low latency demand. Given that setup, we aim at optimally allocating...
We summarize and present the available body of knowledge in trusted and secure design of analog/mixed-signal/ radio frequency (RF) integrated circuits (ICs) and intellectual properties (IPs), covering both known vulnerabilities and available remedies. Furthermore, we discuss the limitations of the current state-of-the-art in this topic, highlight the concomitant risks, and suggest research directions...
Hybrid preprocessing, where an analogue preprocessing matrix is used to feed a large antenna array to fewer up/down-conversion chains, helps reduce hardware cost of massive Multiple-Input-Multiple-Output systems. Here, we analyze a variant of hybrid preprocessing, namely hybrid preprocessing with selection (HPwS), as an attractive solution to reduce this hardware cost while retaining good performance...
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.