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Publications (16)
Radar target identification based on resonant frequencies requires analysis of the “late-time” portion of the target signature: the period when early-time scattering has ceased, the resonant frequencies are well established, and the signal can still be distinguished from the noise. While target geometry can be used to determine the late-time commen...
In a satellite navigation system such as the Global Positioning System (GPS), the receiver is required to determine its position accurately from time-difference-of-arrival (TDOA) measurements of incident signals. We will examine the receiver solution space of an estimator which is maximum-likelihood under the assumption of Gaussian measurement erro...
We consider a multiple-input, multiple-output (MIMO) communication system in which data streams are independently transmitted over a number of antennas and collectively decoded from a number of receiving antennas. The maximum-likelihood (ML) or sphere decoder is known to yield the lowest symbol error rate (SER). However, in the worst case, complexi...
Recently, a novel transmission technique was proposed for delay-spread channels that guarantees a low peak-to-average power ratio while also having low computational complexity. In this paper, we extend the technique to systems where the symbol length or number of parallel channels is large, such as in very high speed digital subscriber line (VDSL)...
This paper presents a new low-complexity multicarrier modulation (MCM) technique based on lattices which achieves a peak-to-average power ratio (PAR) as low as three. The scheme can be viewed as a "drop in" replacement for the discrete multitone (DMT) modulation of an asymmetric digital subscriber line modem. We show that the lattice-MCM retains ma...
The lattice An* is an important lattice because of its covering properties in low dimensions. CONWAY AND SLOANE [3] appear to have been the first to consider the problem of computing the nearest lattice point in An*. They developed and later improved [4] an algorithm which is able to compute a nearest point in O(n2) arithmetic steps. In this paper,...
The problem of estimation of the period of a pulse train from a set of sparse, noisy measurements of the times-ofarrival, and the association of pulse indices with the measurements, is considered for a pair of statistical models of the measurement process. We find that the estimation and association problem can be formulated as a simultaneous Dioph...
. A theory is presented for simultaneousDiophantineapproximation by means of minimal sets of lattice points, defined in a certain sense. We show that successive minima can be used to find best simultaneous Diophantine approximations. We construct algorithms for producing these minima, and consequently best approximations, for lattices of the second...
In problems such as baud-rate estimation in telecommunications and pulse-repetition-interval analysis in Electronic Support, it is necessary to accurately estimate period from a set of timing measurements of a periodic event which are sparse and noisy. Using a statistical model for the timing data, an algorithm for maximum-likelihood estimation is...
We analyse a class of simple statistics, which we call sums of conjugate products, for the purpose of detecting tones and chirps in noise. These statistics have been studied be-fore for their powers of estimation. In this paper, we derive their asymptotic statistics and compare their discriminating power against the energy detector. We find that a...
Radars and radar-intercept receivers are designed to search. The search may be conducted over several parameters, including angle and centre frequency. Typically, the search is periodic. The same region in parameter space is periodically re-visited or scanned. In order for the receiver to intercept emissions from a radar, the scans must 'line up' a...