Precoder Index Modulation

TL;DR

This paper introduces precoder index modulation, a novel scheme where information is encoded via precoder matrix choices, enhancing spectral efficiency and error performance when combined with spatial modulation.

Contribution

It proposes a new precoder index modulation scheme and combines it with spatial modulation to improve information encoding methods in wireless communication.

Findings

Enhanced spectral efficiency demonstrated

Improved bit error performance shown

Effective combination of PIM and SM schemes

Abstract

Index modulation, where information bits are conveyed through antenna indices (spatial modulation) and subcarrier indices (subcarrier index modulation) in addition to information bits conveyed through conventional modulation symbols, is getting increased research attention. In this paper, we introduce {\em precoder index modulation}, where information bits are conveyed through the choice of a precoder matrix at the transmitter from a set of pre-determined pseudo-random phase precoder (PRPP) matrices. Combining precoder index modulation (PIM) and spatial modulation (SM), we introduce a PIM-SM scheme which conveys information bits through both antenna index as well as precoder index. Spectral efficiency (in bits per channel use) and bit error performance of these index modulation schemes are presented.