Based on the technique of generalized likelihood ratio test, we address detection schemes for Doppler-shifted range-spread targets in Gaussian noise. First, a detection scheme is derived by solving the maximization associated with the estimation of unknown Doppler frequency with semi-definite programming. To lower the computational complexity of the detector, we then consider a simplification o...

This paper describes a differentially coherent decorrelating detector for aK-user reverse link code-division multipleaccess environment that exhibits time-varying Rayleigh fading. The channel is modeled as providing only a single fading path for each user and with no additional means to achieve diversity. The design of the detector is based on using fractionally sampled matched filter outputs t...

Generalized Order Statistic Cell Averaging (GOSCA), Generalized Order Statistic Greatest Of (GOSGO), and Generalized Order Statistic Smallest Of (GOSSO) CFAR detectors are proposed. Each of them has its own advantages according to radar environment situations so that most effective radar detector can be chosen at any unpredictive situation. Their performance formulas in terms of false alarm pro...

When an intense sub-nanosecond positron pulse impinges upon a target, a pulse of g-rays is created which can yield information concerning electron–positron pairs just prior to annihilation. Many conventional g-ray detectors are unable to exploit the timing information contained within such pulses, and we describe here the development of a fast detector that is able to do so. Using a singlecryst...

Optical code division multiple access (OCDMA) is a promising multiple access scheme for next generation passive optical networks (NG-PON). It can afford subscribers with a flexible Gb/s bandwidth for the upstream. However, OCDMA suffers from multiple access interference (MAI) that significantly reduces the performance of the system. To alleviate the undesirable impact of the MAI, we propose a p...

Abstract—The Spatially Modulated Light CMOS detector (SML CMOS detector) removes the slow part of the current response of a traditional CMOS photodetector, by using the difference between the signals of an immediate and a deferred detector. This slow part of the current response limits the maximum frequency of a photodetector in the conventional CMOS technology to a few MHz. Experimental eviden...

phase sensitive detector described here has two principal applications: a- to produce a d.c out put proportional to- the amplitude of an incoming a,c signal and indicate, by the outut polarity, the phase of the signal with respect to an internal reference. b- to detect the presence of a signal of known phase and frequency which would otherwise be lost in «background noise» and to measure its am...

Magnetic recording systems employ conventional timing recovery to synchronize the sampler with the readback signal. However, conventional timing recovery does not perform well when the timing error is large. This paper proposes the bi-directional timing recovery, which utilizes conventional timing recovery to sample the readback signal both in forward direction and in backward direction. The ou...

In this thesis, we present a reduced-complexity decision-directed joint timing and phase recovery method for continuous phase modulation (CPM). Using a simple linear modulation—pulse amplitude modulation (PAM)—representation of CPM, more popularly known as the Laurent representation of CPM, we develop formulations of a PAM based joint timing error detector (TED) and a phase error detector (PED)...