In this paper the extended autocorrelation velocity estimator is evaluated and compared using a nondestructive ultrasonic device. For this purpose, three velocity estimators are evaluated and compared. The autocorrelation method (ACM) is the most used and well established in current ultrasonic velocity profiler technology, however, the technique suffers with phase aliasing (also known as the Ny...

A theory and a system for capturing an audio scene and then rendering it remotely are developed and presented. The sound capture is performed with a spherical microphone array. The sound field at the location of the array is deduced from the captured sound and is represented using either spherical wave-functions or plane-wave expansions. The sound field representation is then transmitted to a r...

——We consider a network of identical agents with arbitrary linear time-invariant (LTI) dynamics such that the network reaches consensus asymptotically. Uniform time delay is taken into account in the communication channels. The goal of this paper is to maximize the delay (so-called delay margin) that the system can tolerate before becoming unstable by implementing a low-order controller to a si...

The use of Nyquist f i l ters in data transmission systems is important in avoiding intersymbol interference. Moreover, the Nyquist f i l ters should be factorable into lowpass transmitter/receiver f i l ter pairs. Here, the design problem is formulated so as t o generate zero-phase FIR lowpass Nyquist f i l ters that can be sp l i t in to min imum and maximum phase par ts . Two factorable mtni...

Wideband spectrum sensing for cognitive radio requires high rate analog to digital (A/D) converters whose power consumption is proportional to the sampling rate. In this article, we propose to use sub-Nyquist non-uniform sampling for spectrum sensing to reduce the power consumption. Since the received signal samples are correlated in the time domain, we estimate the missing samples by using the...

In this paper, we analyzed efficient decoding scheme with faster than Nyquist (FTN) signaling that is transmission method faster than Nyquist theory and increase the throughput. We proposed BCJR equalization model to minimize inter symbol interference when faster than Nyquist signal is transmitted. The presented model utilized interference as branch information and iteratively exchange probabil...

Aliasing due to unwanted, spurious out-of-band signals is a problem in many applications that use A/ D converters. These signals, if not filtered properly, can seriously impact the performance of a data-conversion system. This application note discusses the principles of anti-aliasing and its effect on system performance. It also offers advice, via an elegant and cost-effective, complete-system...

In this paper we study the Zak transform which is a signal transform relevant to time-continuous signals sampled at a uniform rate and an arbitrary clock phase. Besides being a time-frequency representation for timecontinuous signals, the Zak transform is a particularly useful tool in signal theory. It can be used to provide a framework within which celebrated themes like the Fourier inversion ...

We present a broadband coherent orthogonal frequency-division multiplexing (OFDM) transceiver based on sampling and low bandwidth electronic analog signal processing. Wideband superchannels, without any guardband are aggregated from OFDM channels in the time domain by Nyquist sinc-pulse sequences with rectangular bandwidth. Therefore, method is called OFDM-Nyquist-time division (TDM). Simulatio...

In a sampled data system, frequency components greater than half the sampling rate "alias" (shift) into the frequency band of interest. Most of the time, aliasing in an undesirable side effect, so the "undersampled" higher frequencies are simply filtered out before the A/D stage. But sometimes, the undersampling is deliberate and the aliasing causes the A/D system to function as a mixer. This a...