Sparse Space-Time-Frequency-Domain Spreading for Large-Scale Non-Orthogonal Multiple Access

A Fair Power Allocation for Non-Orthogonal Multiple Access in the Power Domain

This paper presents an investigation on the performance of the Non-Orthogonal Multiple Access (NOMA) in the power domain scheme. A Power Allocation (PA) method is proposed from NOMA throughput expression analysis. This method aims to provide fair opportunities for users to improve their performance. Thus, NOMA users can achieve rates higher than, or equal to, the rates obtained with the convent...

Orthogonal Space-Time Spreading Transmit Diversity

AbstractIn this paper, a new 2-antenna transmit diversity, called orthogonal space-time spreading transmit diversity (OSTSTD) combined with time diversity transmission, is proposed. At the transmitter, N data symbols to be transmitted are spread using N different orthogonal space-time spreading codes (each represented by N-by-N matrix) and are transmitted from two transmit antennas after adding...

Orthogonal multiple access over time- and frequency-selective channels

Suppression of Multi-User Interference (MUI) and mitigation of timeand frequency-selective (doubly-selective) channel effects constitute major challenges in the design of thirdgeneration wireless mobile systems. Relying on a Basis Expansion Model (BEM) for doubly-selective channels, we develop a channel-independent block spreading scheme that preserves mutual orthogonality among single-cell use...

Large Scale Experiments Data Analysis for Estimation of Hydrodynamic Force Coefficients Part 1: Time Domain Analysis

This paper describes various time-domain methods useful for analyzing the experimental data obtained from a circular cylinder force in terms of both wave and current for estimation of the drag and inertia coefficients applicable to the Morison’s equation. An additional approach, weighted least squares method is also introduced. A set of data obtained from experiments on heavily roughened circul...

Space-Time FSK for Slow Frequency-Hopping Multiple Access