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.
A 2.4 GHz 365nW wake-up receiver (WuRX) with RF envelope detection using rectifier-antenna co-design for passive voltage gain and RF filtering is presented. The RF frequency-tunable WuRX uses a programmable 32-bit OOK wake-up signature, achieving sensitivity of −61.5dBm for 2.5 kb/s without any off-chip matching components between IC and antenna. RF filtering in the high-Q rectifier-antenna interface...
As a natural limited resources, the radio frequency spectrum should be managed and used as efficiently as possible. The Government as regulator has a responsibility to manage and regulate the spectrum to prevent interference. One example of the many problems in Indonesia that must be solved is the spectrum in 2.1 MHz frequency band for 3G services. The CDMA 2000 and UMTS system occupy adjacent band...
A transceiver suitable for devices in wireless body area networks is presented. Stringent requirements are imposed by the high link loss between opposite sides of the body, about 85 dB in the 2.45 GHz ISM band. Despite this, minimum physical size and power consumption are required, and we target a transceiver with 1 mm2 chip area, 1 mW active power consumption, and data rate 250 kbit/s. The receiver...
This paper investigates the performance of DCS1800/TD-LTE dual-mode and dual-link (DM-DL) UE, and presents an effective solution based on our designed high isolation antenna for the UE local electromagnetic interference (EMI). Firstly, we bring out a DCS1800/TD-LTE DM-DL UE system model, together with its interference analysis and performance evaluation. It is revealed that the receiving sensitivity...
This paper introduces antenna-based “smart skin” sensors that are integrated with RFIDs for wireless sensor networks. Furthermore, the paper shows wireless energy harvesting capabilities to enable battery-less, or sustainable, wireless sensor networks with “smart skin” sensor nodes. These sensors are highly applicable for industrial applications: carbon-nanotube-based gas sensor, pressure sensor,...
This paper models the periodic characteristics of body sensor network (BSN) wireless channels measured using custom hardware in the 900-MHz and 2.4-GHz bands. The hardware logs received signal strength indication (RSSI) values of both bands simultaneously at a sample rate of 1.3 kS/s. Results from a measurement campaign of BSNs are shown and distilled to reveal characteristics of BSN channels that...
We present a simple receiver front end that makes use of the baseband superregeneration principle to detect ultrawideband (UWB) impulse radio signals. The UWB antenna is directly connected to the core circuit consisting of a resistor-capacitor (RC) network coupled to a negative resistance that varies under the control of an external quench generator. Due to a step-recovery-diode quench shaper, 50-ps...
An ultra-low power transceiver for battery-free wireless sensor networks is presented. The receiver uses a modified super-regenerative architecture with BFSK modulation to improve speed and sensitivity. Transmitter efficiency is improved by using a power oscillator to directly drive the antenna. The entire transceiver achieves a total link energy less than 1nJ/b and can communicate over distances...
This contribution deals with the complete design of a multi-standard GPS/GALILEO front-end, from setting the specifications through to the complete characterization of the device. Special focus will be given to the design for test and the characterization of the design, as optimizing the time spent on this improves time-to-market for the product under development. The highly integrated, low power...
Up to now, combat aircrafts are fitted with Fire Control Radar (FCR), Electronic Warfare System (EWS), and radio links. Each of these systems is dedicated to a particular task and the cooperation is reduced to a minimal exchange of information between them, so far. Major system performance enhancements are to be expected from close co-operations to each other sensors. The future co-operations can...
Shipboard communications architectures that couple multiple radio frequency channels to a limited number of antennas have typically relied upon the use of cavity-tuned, electromechanically-based multicouplers. Using this approach, sufficient channel isolation can be obtained to minimize mutual, cosite interference among the various channels, however, the required multicouplers are large, expensive...
In this paper we introduce the mean effective radiated power (MERP) and the mean effective radiated sensitivity (MERS) as alternative figures of merit of the uplink and downlink communication performance of wireless handheld terminals. We show how they are related to the mean effective gain (MEG), the total radiated power (TRP) and total receiver sensitivity (TRS).
The traditional way of evaluating receiver sensitivity is to measure the Total Isotropic Sensitivity (TIS) in an anechoic environment. Very few wireless terminals with small antennas are used in an anechoic environment. This paper will describe three alternative methods to measure the receiver sensitivity in a reverberation chamber, each of which can be done in less than 10 minutes which is much faster...
Correlative minimum shift keying (MSK), a second order polynomial modulation scheme known as tamed frequency modulation (TFM), is a constant envelope type of modulation with a perfect peak to average power ratio (PAPR), besides the property of low out of band power. We apply the linearized TFM to the single carrier transmission with frequency domain equalization (SC/FDE) concept. We then obtain a...
This paper investigates the effective gain of antennas in indoor channels. A metric called instantaneous effective gain is proposed, and a multiple-cluster 3D channel model is used to facilitate the proposed antenna effective gain. In the multiple-cluster channel model, Laplacian and double exponential distribution are utilized to model azimuth and elevation signal power distribution respectively,...
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.