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The first is the CSI exchange among the coordinated BSs, but this is a common requirement for all CB schemes.
The paper presents an investigation of the accuracy and efficiency of artificial compressibility, characteristics-based (CB) schemes for variable-density incompressible flows.
The CB schemes have been implemented in conjunction with a multigrid method for accelerating numerical convergence and a fourth-order, explicit Runge Kutta method for the integration of the governing equations in time.
The implementation of the CB schemes is obtained in conjunction with first-, second- and third-order interpolation formulas for calculating the variables at the cell faces of the computational volume.
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Figure 1 Framework of the proposed CB scheme.
The computations revealed that accuracy and efficiency depend on the CB scheme design.
We consider a CB scheme over quasi-static flat-fading channels as shown in Figure 1.
The framework of such CB scheme can be seen in Figure 1, where a two-phase cooperative broadcasting is illustrated.
The best multigrid convergence rates were exhibited by the conservative CB scheme, which is obtained by the fully conservative formulation of the variable-density, incompressible equations.
In contrast, the CoMP coordinated beamforming (CB) scheme only requires sharing the CSI of the interfered users among cooperated BSs and is therefore more feasible for practical implementations [4 10].
In such a case, the CB-FMT scheme becomes the dual of the OFDM system that uses, instead, a rectangular window in the time domain.
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