Energy Efficient Precoder Design for MIMO-OFDM with Rate-dependent Circuit Power

TL;DR

This paper proposes an energy-efficient precoder design for MIMO-OFDM systems that accounts for rate-dependent circuit power, formulating the problem as a convex fractional program and analyzing system parameter impacts.

Contribution

It introduces a novel energy-efficient precoder design considering rate-dependent circuit power, solved via convex fractional programming and bisection algorithm.

Findings

Optimal power allocation is achieved through convex fractional programming.

Circuit power modeled as rate-dependent affects energy efficiency.

System parameters influence energy consumption and system performance.

Abstract

This paper studies an energy efficient design of precoders for point-to-point multiple-input-multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems. Differently from traditional approaches, the optimal power allocation strategy is studied by modelling the circuit power as a rate-dependent function. We show that if the circuit power is a constant plus an increasing and convex function of the transmission rate, the problem of minimizing the consumed energy per bit received can be reformulated as a convex fractional program and solved by means of a bisection algorithm. The impact of the some system parameters is investigated either analytically or by means of computational results.