We present large-eddy simulations of flow in a wire-wrapped fuel assembly at subchannel Reynolds numbers of Reh=4684–29184. The domain consists of a single pin in a hexagonally periodic array, corresponding to two interior subchannels. Periodic boundary conditions are also used in the axial direction over a single wire-wrap period.

Non-orthogonal multiple access (NOMA) has been considered a promising technique for the fifth generation (5G) mobile communication networks because of its high spectrum efficiency. In NOMA, by using successive interference cancellation (SIC) techniques at receivers, users with different channel gain can be multiplexed together in same subchannel concurrent transmission spectrum. The simultaneou...

We investigate the capacity of the Q-frequency Suser vector adder channel (channel with intensity information) introduced by Chang and Wolf. Both coordinated and uncoordinated types of transmission are considered. Asymptotic (under the conditions Q → ∞, S = γQ and 0 < γ < ∞) upper and lower bounds on the relative (per subchannel) capacity are derived. The lower bound for the coordinated case is...

We present large-eddy simulations of flow and heat transfer in a wire-wrapped fuel assembly at subchannel Reynolds numbers of Reh=4684–29184. The domain consists of a single pin in a hexagonally periodic array, corresponding to two interior subchannels. Periodic boundary conditions are also used in the axial direction over a single wire-wrap period.

This letter studies the energy efficiency (EE) optimization of cooperative visible light communication (VLC) systems while considering inter-cell interference and lineof-sight blockage problems. Specifically, problem subchannel power allocation to maximize EE under transmit budgets users' minimum rate constraints is considered. The formulated turns out be a difficult nonlinear fractional progra...

This letter proposes a novel block differentially encoded OFDM for multicarrier transmissions over frequency-selective fading channels. Choosing appropriate system parameters, we divide the set of correlated subchannels into subsets of independent subchannels. Within each subset, differential unitary space-time modulation is performed by treating each subchannel as a transmit-antenna. In additi...