Non-Orthogonal Multicarrier Waveform for Radar With Communications Systems: 24 GHz GFDM RadCom

Jessica B Sanson,Paulo P Monteiro,Atilio Gameiro,Daniel Castanheira

doi:10.1109/access.2019.2940299

Abstract

In this paper, we propose the usage of Generalized Frequency Division Multiplexing (GFDM), a non-orthogonal multicarrier waveform for radar. We presented a novel method that cancels the effect of interference caused by the non-orthogonality of GFDM waveform in the radar processing, thus not affecting the performance of the radar. We show the viability of GFDM for radar with communications systems and the benefits of using it over Orthogonal Frequency Division Multiplexing (OFDM). Finally, we also present GFDM as a solution to mitigate inter-system interference in radar with communications (RadCom) systems, thus showing that GFDM may prove to be a better candidate than OFDM for RadCom applications. This method is validated with simulations and practical measurements at 24 GHz.

Highlights

Combined radar/communications systems (RadCom) use the same hardware and signals to perform target detection and communication simultaneously
The results demonstrate the viability of Generalized Frequency Division Multiplexing (GFDM) for RadCom systems, which combine radar and communications functions
We demonstrate that the proposed processing of GFDM using the matched filter at the receiver (GFDMPMF) results in superior radar performance compared to using zero forcing

Summary

INTRODUCTION

Combined radar/communications systems (RadCom) use the same hardware and signals to perform target detection and communication simultaneously. The use of Orthogonal Frequency Division Multiplexing (OFDM) for radar was first proposed in [11], and preliminary studies of the integration of radar and communication functionalities were carried out in [12]. In [34], it is demonstrated that GFDM can utilize the time and frequency resources more efficiently than OFDM and outperform it under challenging channel conditions for intelligent transportation systems. Motivated by these attractive features, in this paper, we present a method for radar processing with GFDM, demonstrating the viability of its use in RadCom systems and its benefits over OFDM.

SYSTEM MODEL

OFDM RADAR

GFDM RADAR

RADAR MEASUREMENTS

PERFORMANCE EVALUATION

CONCLUSION