Discrete-Fresnel Domain Channel Estimation in OCDM-Based Radar Systems

被引：10
作者：
de Oliveira, Lucas Giroto [1 ]
Nuss, Benjamin [1 ]
Alabd, Mohamad Basim [1 ]
Diewald, Axel [1 ]
Li, Yueheng [1 ]
Gehre, Linda [1 ]
Long, Xueyun [1 ]
Antes, Theresa [1 ]
Galinsky, Johannes [1 ]
Zwick, Thomas [1 ]
机构：
[1] Karlsruhe Inst Technol KIT, Inst Radio Frequency Engn & Elect IHE, D-76131 Karlsruhe, Germany
来源：
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2023年 / 71卷 / 05期
关键词：
Channel estimation; multiple-input-multiple-output (MIMO); orthogonal chirp-division multiplexing (OCDM); radar-communication (RadCom); radar sensing; WAVE; FREQUENCY; DESIGN;
D O I：
10.1109/TMTT.2022.3226722
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Orthogonal chirp-division multiplexing (OCDM) has been recently proposed as an alternative scheme to orthogonal frequency-division multiplexing (OFDM) for data communication. Among the reasons for that are its superior robustness, e.g., to frequency selectivity of channels and intersymbol interference. Furthermore, channel estimation in the discrete-Fresnel domain has been investigated for both communication and sensing, without, however, considering the effects of frequency shifts. This article investigates the discrete-Fresnel domain channel estimation in OCDM-based radar systems as an alternative to the correlation-based processing from the conventional OCDM (C-OCDM) radar-communication (RadCom) system, which yields high, transmit-data-dependent sidelobe level. In this context, a mathematical formulation for the investigated channel estimation approach is presented. In addition, extensions to multiuser/multiple-input-multiple-output (MIMO) and to a sector-modulated OCDM (SM-OCDM) RadCom operation are introduced. Finally, the performance of the proposed schemes is analyzed based on simulation and measurement results for an emulated automotive scenario. In summary, both OCDM-based radar and SM-OCDM RadCom systems yield improved peak-to-average power ratio and comparable or improved radar performance in terms of sidelobe level and Doppler shift robustness to their C-OCDM and OFDM counterparts for practical range and velocity values. In addition, equal communication performance robustness to C-OCDM, which outperforms OFDM, is experienced in the SM-OCDM case.
引用
收藏
页码：2258 / 2275
页数：18
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