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We present matrix factorization as an enabling technique for analog-to-digital matrix multiplication (AD-MM). We show that factorization in the analog domain increases the total precision of AD-MM in precision-limited analog multiplication, reduces the number of analog-to-digital (A/D) conversions needed for overcomplete matrices, and avoids unneeded computations in the digital domain. Finally, we...
This paper addresses a problem of chaotic secure communication. Unlike existing works, the switched chaotic system with three sub-chaotic systems is employed for providing high-security in communication. To end this, not only the appropriate synchronization scheme but also an adaptive estimator for estimating switching signals are designed. From simulation results, it can be found that proposed methods...
This paper studies relay amplifying matrices and transmitter/receiver beamforming vectors of the amplify-and-forward (AF) multiple-input multiple-output (MIMO) half-duplex (HD)/full-duplex (FD) wireless distributed relay systems. The main objective of this paper is to determine a set of relay amplifying matrices and transmitter/receiver beamforming vectors under transmit power constraints at the source...
In this paper, a novel 3D localization and identification system based on surface acoustic wave (SAW) devices has been designed and modeled. Two mobile SAW devices have been tracked based on the time of arrival (TOA) approach. The capability of the system to track multiple sensors within the same observation area is demonstrated by configuring the SAW devices in different geometries. Using Barker...
Drill string acoustic telemetry is an effective transmission method to retrieve downhole data in drilling applications. In practice, pipes used for drilling deep wells have slight variation in length. The arrangement of downhole pipes plays a vital role for improving the transmission efficiency of extensional waves transmitted through the drill string. Finite-difference modeling produce the comb-filter-like...
Sonar has been the Navy's workhorse for detection and discrimination of underwater objects from clutter through analysis of image phenomena. However, new phenomena need to be identified to accommodate a growing class of unexploded ordnance targets with more varied shapes and sizes, and difficulties increase for buried ordnance because the wave attenuation and inhomogeneity in ocean sediments make...
This study proposes a new wireless skin moisture detection system using a capacitive sensor rather than traditional optical methods. Moisture is the most important factor for maintaining healthy skin. The moisture in the skin can be detected by a capacitive sensor. The aim of this study was to design a wireless capacitive senor skin moisture detection system. The capacitive sensor was pressed onto...
U-healthcare industry has appeared and devel-oped rapidly due to the development of the telecommunication and Health care technology, the increase of the needs of the Health care providers, and increment of the demands of the Health care users. The core factor of the U-Healthcare fields is the monitoring technique for the patients. In this paper, designed the system which was composed of power line...
Received Signal Strength (RSS) measurements obtained at locations in the vicinity of an emitter can be used to estimate the emitter location given a suitable path loss model. For commonly used propagation models, the RSS has a dependence on the emitter to sensor separation, d, of the form P ∝ d−α, where the path loss exponent, α, is typically between 2 and 4 depending on the terrain. This uncertainty...
The use of infrared radiation as a medium for high speed and short-range application is proposed for communication in the aircraft passenger cabin since it does not cause any interference to aircraft navigation systems. In this paper: first of all, using Lambert's model, the power received at the receiver via single reflection propagation inside the cabin was modeled. Then, the free space loss which...
A new partial transmit sequence (PTS) technique for orthogonal frequency division multiplexing (OFDM) signals which does not require side information, is proposed. In the proposed method, the transmitter applies PTS to reduce the peak-to-average power ratio (PAPR) and does not send the side information on the PTS phase factors to the receiver. Based on the OFDM symbol structure having pilot subcarriers,...
This work describes the first multiband WCDMA/HSPA/EGPRS single-chip transceiver with GPS and receiver diversity. This device supports UMTS bands 1,2,3,4,5,6,8,9,10 and GSM/EDGE 800, 900, 1800, 1900 MHz bands. It is implemented in cost-effective 0.18 mum RF CMOS technology and uses a reduced number of TX and RX SAW filters.
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