Andrew L. Drozd

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We consider the problem of joint admission control and resource allocation in a secondary code-division network coexisting with a narrow-band primary system. Our objective is to find the maximum number of admitted secondary links and then find the optimal transmitting powers and code sequences of those secondary links such that the total energy consumption(More)
We propose a modified Bayesian Cramér-Rao lower bound (BCRLB) for nonlinear tracking applications where the prediction distribution conditioned on past measurements is used as the prior. The novelty of the proposed modified BCRLB comes from the fact that it utilizes past measurements, therefore it is specific to the current realization of the track(More)
We consider the problem of joint admission control and power allocation in a multiband cognitive radio network (CRN) coexisting with multiple narrowband primary systems, and investigate two separate optimization problems: i) sum-rate maximization under primary user (PU) and secondary user (SU) quality of service (QoS) constraints; ii) sum-rate maximization(More)
This paper introduces innovative technology development that will improve performance of next-generation cognitive wireless networking among space, air, and ground assets. The paper describes methods to develop a system where cognitive users transmit wideband spread-spectrum signals that are designed to adaptively avoid the interference dynamics of the(More)
In this paper, we propose a novel distributed deadline-based routing and spectrum allocation algorithm for tactical ad-hoc networks. The proposed algorithm will enable nodes to adapt to various deadline requirements unique to each traffic classes. A tactical ad-hoc network needs to handle a variety of data flowing through the network including voice,(More)
We consider the problem of joint resource allocation and admission control in a secondary code-division network coexisting with a narrowband primary system. Our objective is to find the maximum number of admitted secondary links and then find the optimal transmitting powers and code sequences of those secondary links such that the total energy consumption(More)
In this paper, we discuss the implementation of a CrOss-layer Based testbed with Analysis Tool (COmBAT). COmBAT is developed to enable the design and development process of next-generation cross-layer based wireless communication technologies for tactical ad-hoc networks. The COmBAT architecture comprises of two major components; (i) Adaptive cross-layer(More)
In this paper, we address the constrained resource allocation problems arising in the context of spectrum sharing in Cognitive Radio Networks utilizing a multi-dimensional formulation. Given the activity of the Primary Users (PUs), we consider multiple objectives and constraints, viz., sum-rate, fairness, number of active Secondary Users (SUs), power(More)