Multiple-input multiple-output (MIMO) wireless systems use antenna arrays at both the transmitter and receiver to achieve high spectral efficiency. Low-complexity detection is essential for the implementation of MIMO systems. In this thesis, a symbol detector for wireless systems using space division multiple access (SDMA) and orthogonal frequency division multiplexing (OFDM) is derived. The de...

We consider symplectic time integrators in numerical General Relativity and discuss both free and constrained evolution schemes. For free evolution of ADM-like equations we propose the use of the Störmer–Verlet method, a standard symplectic integrator which here is explicit in the computationally expensive curvature terms. For the constrained evolution we give a formulation of the evolution equ...

in this paper, we present a genetic algorithm (ga) for optimization of a multi-mode resource constrained time cost trade off (mrctct) problem. the proposed ga, each activity has several operational modes and each mode identifies a possible executive time and cost of the activity. beyond earlier studies on time-cost trade-off problem, in mrctct problem, resource requirements of each execution mo...

In this paper, we prove that the \(C^0\) and \(C^1\) topologies are same on set of regular curves in 2-sphere whose tangent vectors Lipschitz continuous, a.e. existing geodesic curvatures essentially bounded an open interval. Besides, study subset consisting start end at given points with directions, is a Banach manifold.

In this paper we continue our earlier study [SM96] on boundary operators for constrained parameter optimization problems. The signi cance of this line of research is based on the observation that usually the global solution for many optimization problems lies on the boundary of the feasible region. Thus, for many constrained numerical optimization problems it might be bene cial to search just t...

Charged particles in a magnetosphere are spontaneously attracted to a planet while increasing their kinetic energy via inward diffusion process. A constraint on particles’ micro-scale adiabatic invariants restricts the class of motions available to the system, giving rise to a proper frame on which particle diffusion occurs. We investigate the inward diffusion process by numerical simulation of...