An algorithm is derived which performs optimal symbolby-symbol detection of a pulse amplitude modulated sequence. The algorithm is similar to the Viterhi algorithm with the optimality criterion optimal symbol detection rather than optimal sequence detection. A salient common feature is the merge phenomenon which allows common decisions to be made before the entire sequence is received.

S Abstract. In two Campylornormyrus species, tamandua and rhynchophorus from Central Africa, the electric organ discharge (EOD) activity was studied during the nocturnal activity phase in the laboratory. Both species have a pulse-type EOD of less than 200 ps duration and similar waveform; the sequence of inter-discharge intervals, however, differed characteristically: C. tamandua displayed a 'm...

A better approach for training a multi-layered feedforward network for pulse compression is presented. The Bayesian regularization technique used for training the network for pulse radar detection results in superior performance in terms of signal-to-sidelobe ratio compared to the Backpropagation algorithm. The presented method also has better range resolution performance in terms of resistance...

We have investigated the use of a "split-sinc" RF pulse to selectively store magnetization from a selected region of a sample, for later recall in imaging or spectroscopy experiments. The pulse sequence is based on an original suggestion by Post et al. (West German Patent No. P3209263.6, 13 March 1982), later implemented by Aue et al. (J. Magn. Reson. 56, 350 (1984)). We have carried out detail...

A new, high-repetition rate laser is in development for use on the Thomson scattering diagnostic on the Madison Symmetric Torus. The laser has been tested at a rate of 200 kHz in a pulse-burst operation, producing bursts of 5 pulses above 1.5 J each, while capable of bursts of 17 pulses at 100 kHz. A master oscillator-power amplifier architecture is used with a Nd:YVO4 oscillator, four Nd:YAG a...

All known time of arrival (TOA) deinterleaving algorithms have great diiculty separating interleaved radar pulse trains when two or more of the trains are significantly jittered. Such scenarios tend to lead to overwhelming ambiguity and fragmentation diiculties when using traditional techniques. In this report we propose a modiied sequence search technique combined with a novel recursive neural...

Sequences of pulsed electric fields have been designed and tested that enable a higher selectivity in the pulsed field ionization of high Rydberg states (n>100) than has so far been possible. The enhanced selectivity originates from the permutation of the parabolic quantum numbers n1 and n2 that is induced by a sufficiently rapid inversion of the electric field polarity during a pulse sequence....

The combined gradient echo/spin echo (GESE) sequence has been used to measure T2 and T2* simultaneously in the brain at 7T in both healthy volunteers and patients . GESE is particularly useful at 7T as it is insensitive to RF pulse errors since errors in either of the pulse flip angles will cause constant attenuation of all the echoes, leading to a simple reduction in SNR, and it has a low SAR....

Magnetic resonance electrical impedance tomography (MREIT) utilizes the relation between conductivity and magnetic flux density induced by externally injected current to perform conductivity imaging of body tissues. A spin echo pulse sequence has been predominantly used in MREIT to acquire the z-component Bz of the induced magnetic flux density data from MR phase images. Spin echo based MREIT p...

A. T. Vu, V. M. Mai, P. V. Prasad, R. R. Edelman Evanston Northwestern Healthcare, Feinberg School of Medicine, Northwestern Univeristy, Evanston, IL, United States Synopsis An alternative T1-weighted fat/water in-phase/out-of-phase gradient echo imaging pulse sequence is proposed for routine body MRI at 3T. The pulse sequence provides T1 weighting using single shot inversion recovery preparati...