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In this paper, we present a user selection scheme with a fairness constraint when zero-forcing beamforming (ZFBF) transmission is employed in a multiple-input multiple-output (MIMO) broadcast channel. This problem can be reduced to the maximization of a weighted sum rate with a power constraint. In this paper, we first derive a lower bound on the weighted sum rate. Roughly speaking, this bound is...
Bend loss can be quantified by following coupling between fundamental and cladding modes with changing curvature on a finite cladding, single-mode slab waveguide. A delineation criterion provides a boundary between approximately adiabatic and non-adiabatic bent waveguides.
The conventional leaky mode description of so- called fundamental mode propagation along single-mode holey fibres can be explained physically in terms of a dominant bound mode, guided predominantly by the central core-hole structure, together with a number of lower-amplitude cladding-like bound modes.
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