High Accuracy Doppler Processing With Low Complexity in OFDM-Based RadCom Systems

We propose a novel positioning-communication integrated signal, which superposes the configurable positioning signal on the communication one to achieve a sub-meter range measurement accuracy. Different from other positioning schemes, there are multi positioning signals on different sub-carriers for different positioning users. The powers and bandwidths of these positioning signals are controllable, which reduces the near-far effect, and improves the range measurement accuracy. Other major contributions are: we analyze the interference of the positioning signal to the communication one; we give the lower-bound and measurement accuracy of the range estimation in both flat and fading channels, and derive their simple expressions. The results show the interaction between the communication and positioning signals is limited, and it is feasible to use the proposed signal for high accuracy positioning.

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“…is the normalized PSD of the n th C-User. Because the PSD of OFDM signal is approximately flat over the whole bandwidth [9]. We have…”

Section: B Interference Of the Communication Signal To Positioning Onementioning

confidence: 99%

A Novel Positioning-Communication Integrated Signal in Wireless Communication Systems

Yin

Cao

Lin

et al. 2019

IEEE Wireless Commun. Lett.

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“…Due to lack of guard intervals in frequency domain, Doppler shifts produced by mobile targets can destroy the orthogonality of OFDM subcarriers at the receiver (i.e., the ICI effect) and reduce the dynamic range of radar due to increased side-lobe levels [16]. To improve OFDM radar performance, various ICI mitigation approaches have been recently proposed [13], [17], [19], [20]. Considering a single-target scenario, a two-step Doppler estimation method is proposed in [17], where transmit sequences with favorable correlation properties are employed to eliminate ICI.…”

Section: Introductionmentioning

confidence: 99%

MIMO-OFDM Joint Radar-Communications: Is ICI Friend or Foe?

Keskin

Wymeersch

Koivunen

2021

IEEE J. Sel. Top. Signal Process.

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“…For traditional processing methods, a processing method based on the discrete Fourier transform (DFT) is proposed in [19][20][21]. The accuracy of range and velocity depends entirely on the number of subcarriers and pulse accumulation time.…”

Section: Introductionmentioning

confidence: 99%

Joint range and velocity estimation for integration of radar and communication based on multi‐symbol OFDM radar pulses

Wang

Zhang

Najafabadi

2021

IET Radar Sonar & Navi

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Integration of radar and communication (IRC) is conducive to improving hardware resource utilization and spectrum utilization. This paper proposes a joint range and velocity estimation method for IRC based on multi-symbol orthogonal frequency division multiplexing (OFDM) radar pulses. A two-step parameters estimation method is applied, where estimating the signal parameters via rotational invariance technique (ESPRIT) and weighted subspace fitting (WSF) perform rough and fine estimations. We first build a receiving model for integrated signal based on element-wise division. The ESPRIT method is then adopted based on the double Vandermonde structure array manifold for a rough estimation. It has relatively high estimation error but low computational complexity. The WSF method based on alternating projection (AP) algorithm is introduced to make the estimation more precise and reduce its error. It uses the estimation results in the first step and reduces the overall computational cost. Simulation results show that the proposed method reduces the computational complexity while improving the estimation accuracy compared with the WSF method.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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High Accuracy Doppler Processing With Low Complexity in OFDM-Based RadCom Systems

Cited by 19 publications

References 6 publications

A Novel Positioning-Communication Integrated Signal in Wireless Communication Systems

A Novel Positioning-Communication Integrated Signal in Wireless Communication Systems

MIMO-OFDM Joint Radar-Communications: Is ICI Friend or Foe?

Joint range and velocity estimation for integration of radar and communication based on multi‐symbol OFDM radar pulses

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