A Desired PAR-Achieving Precoder Design for Multi-User MIMO OFDM based on Concentration of Measure

TL;DR

This paper introduces a convex optimization-based precoding scheme for multi-user MIMO OFDM systems that precisely controls the peak-to-average power ratio (PAR) while minimizing SNR degradation, leveraging measure concentration properties.

Contribution

It presents a novel convex formulation for PAR control in MIMO OFDM precoding that nearly exactly achieves desired PAR levels asymptotically.

Findings

Almost exact PAR achievement on average.

Asymptotic PAR attainment at the 0.001 CCDF point.

Effective PAR control with minimal SNR loss.

Abstract

For multi-user multiple-input and multiple-output (MIMO) wireless communications in orthogonal frequency di- vision multiplexing systems, we propose a MIMO precoding scheme providing a desired peak-to-average power ratio (PAR) at the minimum cost that is defined as received SNR degradation. By taking advantage of the concentration of measure, we formulate a convex problem with constraint on the desired PAR. Consequently, the proposed scheme almost exactly achieves the desired PAR on average, and asymptotically attains the desired PAR at the 0.001 point of its complementary cumulative distribution function, as the number of subcarriers increases.