We analyzed the effect of time and frequency domain windowing, or weighting, of the transmitted signal for least squares (LS) and minimum mean-square error (MMSE) estimators when the channel is time-variant. We considered the estimation error for different windows and we found that the windows can be selected independently. We explained the performance of the estimators with the help of the rad...

This contribution considers the data-aided (DA) maximum-likelihood carrier phase ambiguity resolution algorithm for coded M-PSK signaling. We derive analytical performance results of the algorithm when operating in the presence of phase estimation errors. As the use of a pilot sequence reduces the spectral efficiency of the system, we determine analytically the minimal pilot sequence length for...

Tree adjoining grammar parsers can use a supertagger as a preprocessor to help disambiguate the category1 of words and thus speed up the parsing phase dramatically. However, since the errors in supertagging propagate to this phase, it is vital to keep the error rate of the supertagger phase reasonably low. With very large tagsets coming from extracted grammars, this error rate can be of almost ...

We propose iterative, adaptive trellis-based blind sequence estimators, which can be interpreted as reduced-complexity receivers derived from the joint ML data/channel estimation problem. The number of states in the trellis is considered as a design parameter, providing a trade-off between performance and complexity. For symmetrical signal constellations, differential encoding or generalization...

The objective of the network endpoint localization problem is to estimate the endpoints (source and destination) of some message passed through a communication network based upon the set of partially synchronized sensors that intercept the message. The topology of the network is unknown, however some prior information about node degrees in the network be available to the monitor. A preliminary ...

Time-of-Flight (ToF) cameras gain depth information by emitting amplitude-modulated near-infrared light and measuring the phase shift between the emitted and the reflected signal. The phase shift is proportional to the object’s distance modulo the wavelength of the modulation frequency. This results in a distance ambiguity. Distances larger than the wavelength are wrapped into the sensor’s non-...

In multi-input multi-output (MIMO) radar system, good orthogonality between transmitting waveforms will fairly simplify the signal processing, along with improve the targets detection as well as the parameters estimation performance of the system. In this paper, a discrete frequency and phase coding waveform (DFPCW), which attains good orthogonality by varying the carrier frequency and initial ...

2014 It is shown that the continuous ambiguity in the reconstruction of scattering amplitudes from data, due to the unobservability of an overall phase, is restricted to a discrete ambiguity in standard partial wave analysis and is removed completely in modified partial wave analysis. Tome 40 ?6 15 MARS 1979 LE JOURNAL DE PHYSIQUE LETTRES Classification Physics Abstracts 11.20 It is well known ...

Although many neuroimaging studies have investigated adolescent risk taking, few studies have dissociated between decision-making under risk (known probabilities) and ambiguity (unknown probabilities). Furthermore, which brain regions are sensitive to individual differences in task-related and self-reported risk taking remains elusive. We presented 198 adolescents (11-24 years, an age-range in ...