Energy Efficiency in Multiuser Transmission Over Parallel Frequency Channels

TL;DR

This paper investigates energy-efficient multiuser transmission over parallel frequency channels, optimizing bandwidth and power allocation to maximize sum rate while satisfying user requirements, and validates the solutions through simulations.

Contribution

It introduces practical methods for optimal resource allocation in multiuser channels to enhance energy efficiency, considering fixed or flexible bandwidth scenarios.

Findings

Optimal resource allocation ensures minimum user rate requirements are met.

Excess resources are allocated to the user with the best channel quality.

Simulation results confirm the effectiveness of the proposed solutions.

Abstract

Energy efficiency is an important design criterion for wireless communications. When parallel frequency channels are used for multiuser transmission, the channel bandwidths and user power are adjusted to maximize the sum information rate with the bandwidth budget, the transmit power budget, and the user-specific rate requirements. The maximum sum rate is used in measuring the energy efficiency. With fixed or flexible bandwidths of the frequency channels, practical methods are developed to find the total transmit power with the unique optimal resource (bandwidth and power) allocation for maximum energy efficiency. This resource allocation ensures that, while each user's minimum rate requirement is satisfied, all the excess resource of the spectrum and transmit power is dedicated to the one user with the best channel quality. Simulation results validate the optimal solutions of total transmit power and resource allocation that support the energy-efficient multiuser transmission.