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Noncoherent UWB receivers promise low power consumption and low processing complexity but their peak data rate is limited by the delay spread of the multipath radio channel. A recently proposed multichannel autocorrelation receiver (AcR) can break this rate limit because it can demodulate multicarrier signals. The hardware implementation of this receiver architecture is addressed in this paper. We...
A lot of Ultra Wideband (UWB) antenna designs, especially printed antenna, have been proposed so far. However, among those proposed designs, only single unit antenna analysis i.e. return loss and radiation pattern at particular frequencies are usually observed. This paper reports a deeper transmission analysis by considering UWB antenna as a system; so called system characterization. For a specific...
Abstract: In view of using symmetrical normalization for smaller deviation than standard normalization for the multi-tau photon correlator in the whole delay time range but need more monitor channels. We suggest employing symmetrical normalization when the lag time larger than 16384 and standard normalization smaller than 16384. Deviation of symmetrical normalization and standard normalization was...
An accurate channel estimation is crucial for the novel time domain synchronous orthogonal frequency-division multiplexing (TDS-OFDM) scheme in which pseudo noise (PN) sequences serve as both guard intervals (GI) for OFDM data symbols and training sequences for synchronization/channel estimation. This paper studies the channel estimation method based on the cross-correlation of PN sequences. A theoretical...
We propose a methodology to simulate realistic 2D Line Edge Roughness (LER) pattern for NanoWire (NW) MOSFETs in TCAD platform. This approach predicts the device characteristic and variations including Vth, Ion and Subthreshold Swing (S.S.) fluctuations more accurately compared with prior literature considering two types of primarily 1D NW geometry variation [1]. Based on the proposed simulation approach,...
In this paper the hardware setup and a field trial of a transmitter delay diversity (DD) system for DRM+ (Digital Radio Mondiale, Mode E) in ‘urban’ areas in the city of Hannover are presented. DD should help against destructive interferences resulting in signal dropouts, especially for slow receiver velocities. A closer look is taken on the spatial correlation of the channel paths and their influence...
Detection of Small Delay Defects (SDDs) is a major concern in modern circuits using nanometer technologies. They are difficult to test and an important source of test escapes, and even when SDDs do not produce functional failures, they represent a reliability risk. The detection of these defects aggravates in the presence of process variations. In this paper, a methodology to detect SDDs in the presence...
Device-to-Device (D2D) underlaying cellular network is considered to be a promising resource reuse technique. While many literatures have been investigating the air-interface performance of D2D in cellular networks from the physical and/or media access control (MAC) layers, we in this paper introduce factors about contents of information streams (upper layer factors) into the system model and conduct...
The deployment of ubiquitous distributed monitoring infrastructure such as perfSONAR is greatly increasing the availability and quality of network performance data. Cross-cutting analyses are now possible that can detect anomalies and provide real-time automated alerts to network management services. However, scaling these analyses to the volumes of available data remains a difficult task. Although...
Orthogonal Frequency Division Multiplexing (OFDM) is considered as an effective method for overcoming problems such as noise, multi-path propagation and frequency selective fading in low voltage power-line communication (PLC). However, OFDM system is sensitive to the error of synchronization. Accurate symbol timing and carrier frequency offset estimation are crucial to the PLC system based on OFDM...
The increasing frequency, rising costs, and growing sophistication of cyber attacks on DoD, agency and commercial enterprise systems are dramatically reducing the quality of end-user services and compromising mission effectiveness. Of those attacks, one of the more severe is Distributed Denial-of-Service (DDoS) through which an attacker can disrupt, and possibly shutdown, local network enclaves and...
In order to jam the pseudo-random code phase modulation (PRCPM) fuze, a new jamming method based on multiple time-delay smart deception has been developed. By analyzing the principle of PRCPM fuze, the model of multiple time-delay smart deception Jamming signal and the algorithm of digital have also been established. Moreover, the interference mechanism of multiple time-delay smart deception Jamming...
This paper discusses the condition under which the jitter buffer at the receiver is to be operated for minimum output variance in a TDMoIP framework. The above study would be useful in the design of synchronization algorithms at the receiver of a TDMoIP network. This work uses the results derived in [1] to the above problem. We model the receiver jitter buffer as a M/G/1 queueing system with EARMA...
Radio technology has been developed extensively for mobile communications and wireless LANs. In a wireless communication channel, we have multipath propagation due to reflections and scatterings. When the delay difference between multipath waves is large, we have frequency selective fading. Thus far, a frequency correlation defined for a single antenna has been used for evaluating the frequency selectivity...
The proposed IMC-PID tuning method is extension of the recently published setpoint overshoot method (2010). It is one step procedure to obtain the PI/PID setting which gives the better performance and robustness. The method requires one closed-loop step setpoint response experiment using a proportional only controller with gain Kc0. Based on simulations for a range of first-order with delay processes,...
In the next generation of mobile communication systems, high data rates and high capacity will be possible if multiple antennas are used at new frequencies. This paper presents the correlations between channel parameter path loss (PL), root mean square delay spread (DS), angular spread (AS), and K-factor established based on channel measurements. The channel measurements were performed in a 781MHz...
We numerically and experimentaly analyze spooled spun fibers showing that spin and bending birefringence interact, originating peculiar PMD behavior. Actually, DGD of spooled spun fibers may be larger than that of the equivalent unspun fibers.
A novel fiber-reflectometric technique using Rayleigh speckle statistical analysis enables us to measure the degree of coherence (DOC) at a continuous delay time. The DOC of a tens of kHz linewidth laser is analyzed.
The Zadoff-Chu sequence-based random access preamble adopted in LTE system supports the convenient detection of preamble ID and propagation delay due to the superb correlation properties, and the conventional preamble detection algorithm is simple and well-performing by using these properties. However the performance is strictly limited by the presence of large propagation delay. This paper gives...
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