Monika Agrawal

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—The problem of providing robustness to the conventional narrow-band uniform linear array configuration so as to handle wide-band and moving jammers is addressed here. This robustness is achieved via the use of derivative constraints in jammer directions. However, since the jammer directions are not known a priori, these constraints are incorporated with a(More)
—The problem of modified ML estimation of DOA's of multiple source signals incident on a uniform linear array (ULA) in the presence of unknown, spatially correlated Gaussian noise is addressed here. Unlike previous work, the proposed method does not impose any structural constraints or parameterization of the signal and noise covariances. It is shown that(More)
—Most of the existing techniques for DOA estimation of broadband sources use both spatial and temporal modeling. This may lead to increased complexity besides a large algorithmic delay. In this paper, we propose a technique that employs only spatial information in the form of a single spatial array covariance matrix. Assuming the source to have an ideal(More)
OBJECTIVES To study the prescription pattern at the different levels of public health facilities of Lucknow district and to assess the average cost of drugs prescribed. METHODS Multi-stage stratified random sampling was done to select 1625 prescriptions of the patients attending the different level of public health facilities in Lucknow district, from(More)
The demand of communicating at higher data rates can be easily met by using wideband signals [1], rendering the problem of estimating the direction of arrival (DOA) of wideband sources quite important. Multipaths, scatterers etc. present near the transmitter provide spatial bandwidth to these sources, which seriously degrade the performance of traditional(More)