Doppler Shift Tolerance of Accumulation and Outer Coding in MIMO-PMCW Radar

Lucas Giroto De Oliveira,Akanksha Bhutani,Theresa Antes,Thomas Zwick,Benjamin Nuss,Elizabeth Bekker,Axel Diewald

doi:10.1109/lmwc.2021.3123691

Lucas Giroto De Oliveira, Akanksha Bhutani + Show 5 more

Open Access

https://doi.org/10.1109/lmwc.2021.3123691

Copy DOI

Abstract

Phase-modulated continuous wave (PMCW) has been widely regarded as a promising modulation scheme for radar systems, e.g., in highly automated driving (HAD) applications. Although the so-called outer coding can efficiently enable the multiple-input-multiple-output (MIMO) operation of PMCW-based radar systems, the yielded processing gain in this multiplexing approach may be reduced at increasing Doppler shifts. In this context, this letter introduces a normalized Doppler shift parameter that enables predicting the Doppler-shift-induced degradation of the processing gain in a MIMO-PMCW radar system. Finally, simulation and measurement results confirm the usefulness of the introduced parameter in desigining MIMO-PMCW radars.

Highlights

I N THE context of highly automated driving (HAD), phasemodulated continuous wave (PMCW) appears as an attractive alternative to enable efficient digital radar sensing [1]–[3] and radar-communication (RadCom) operation [4]–[8] at the cost of moderate hardware requirements [9] compared to, e.g., orthogonal frequency-division multiplexing (OFDM) [10], [11], while posing high data rate and storage requirements [12]
Let a MIMO radar system consist of an in-band full duplex (IBFD) radio frequency (RF) device, in which orthogonal PMCW signals are transmitted by P ∈ N+ transmit antennas and reflections off targets are captured by Q ∈ N+ receive antennas
This letter discussed the Doppler shift tolerance of accumulation and outer coding in the MIMO-PMCW radar system

Summary

INTRODUCTION

I N THE context of highly automated driving (HAD), phasemodulated continuous wave (PMCW) appears as an attractive alternative to enable efficient digital radar sensing [1]–[3] and radar-communication (RadCom) operation [4]–[8] at the cost of moderate hardware requirements [9] compared to, e.g., orthogonal frequency-division multiplexing (OFDM) [10], [11], while posing high data rate and storage requirements [12]. In this sense, the maximum unambiguous velocity must be constrained while parameterizing a MIMO-PMCW radar system and the Doppler shift tolerance of accumulation and decoding must be considered. The maximum unambiguous velocity must be constrained while parameterizing a MIMO-PMCW radar system and the Doppler shift tolerance of accumulation and decoding must be considered This letter addresses this issue by introducing a normalized Doppler shift parameter that takes into account key aspects of a MIMO-PMCW radar system independently of the adopted PRBS. This enables a straightforward prediction of the resulting degradation of the processing gain of accumulation and decoding

MIMO-PMCW RADAR SYSTEM MODEL

NUMERICAL AND MEASUREMENT RESULTS

CONCLUSION