Probability of Pilot Interference in Pulsed Radar-Cellular Coexistence: Fundamental Insights on Demodulation and Limited CSI Feedback

Rao, Raghunandan M.; Marojevic, Vuk; Reed, Jeffrey H.

doi:10.1109/lcomm.2020.2991434

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…In addition, results from [24] have shown lower link-level performance because of inaccurate CSI estimates in pulsed radar-LTE coexistence. Our prior work [25] rigorously proved that the S-CSI acquired for the interference channel is inaccurate for a wide range of radar repetition intervals.…”

Section: B Motivationmentioning

confidence: 92%

Semi-Blind Post-Equalizer SINR Estimation and Dual CSI Feedback for Radar-Cellular Coexistence

Rao,

Marojevic,

Reed

2020

Preprint

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Current cellular systems use pilot-aided statistical-channel state information (S-CSI) estimation and limited feedback schemes to aid in link adaptation and scheduling decisions. However, in the presence of pulsed radar signals, pilot-aided S-CSI is inaccurate since interference statistics on pilot and non-pilot resources can be different. Moreover, the channel will be bimodal as a result of the periodic interference.In this paper, we propose a max-min heuristic to estimate the post-equalizer SINR in the case of nonpilot pulsed radar interference, and characterize its distribution as a function of noise variance and interference power. We observe that the proposed heuristic incurs low computational complexity, and is robust beyond a certain SINR threshold for different modulation schemes, especially for QPSK. This enables us to develop a comprehensive semi-blind framework to estimate the wideband SINR metric that is commonly used for S-CSI quantization in 3GPP Long-Term Evolution (LTE) and New Radio (NR) networks. Finally, we propose dual CSI feedback for practical radar-cellular spectrum sharing, to enable accurate CSI acquisition in the bimodal channel. We demonstrate significant improvements in throughput, block error rate and retransmission-induced latency for LTE-Advanced Pro when compared to conventional pilot-aided S-CSI estimation and limited feedback schemes.

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Section: B Motivationmentioning

confidence: 92%

Semi-Blind Post-Equalizer SINR Estimation and Dual CSI Feedback for Radar-Cellular Coexistence

Rao,

Marojevic,

Reed

2020

Preprint

Self Cite

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“…One way is to have such information is by sending training signal by DFRC transmitter to all communication receivers or by getting through coordination office connected to both radar and communication system [38]; this burdens the system in terms of spectrum and computational complexities. It is concluded by [102] that those communication users who are trying to obtain the spectrum initially allocated to radar must guarantee the target detection rather than obtaining ICSI.…”

Section: Spectrum Sharing Approaches For Dfrcmentioning

confidence: 99%

A Comprehensive Study of Past, Present, and Future of Spectrum Sharing and Information Embedding Techniques in Joint Wireless Communication and Radar Systems

Munir

Basit

Khan

et al. 2022

Wireless Communications and Mobile Computing

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Wireless spectrum is a limited resource, and the rapid increase in demand for wireless communication-based services is increasing day by day. Hence, maintaining a good quality of service, high data rate, and reliability is the need of the day. Thus, we need to apportion the available spectrum in an efficient manner. Dual-Function Radar and Communication (DFRC) is an emerging field and bears vital importance for both civil and military applications for the last few years. Since hybridization of wireless communication and radar designs provoke diverse challenges, e.g., interference mitigation, secure mobile communication, improved bit error rate (BER), and data rate enhancement without compromising the radar performance, this paper reviews the state-of-the-art developments in the spectrum shared between mobile communication and radars in terms of coexistence, collaboration, cognition, and cooperation. Compared to the existing surveys, we explore an open research issue on radar and mobile communication operating with mutual benefits based on collaboration in terms of spectrum sharing. Additionally, this paper provides important perspectives for future research of DFRC technology.

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Probability of Pilot Interference in Pulsed Radar-Cellular Coexistence: Fundamental Insights on Demodulation and Limited CSI Feedback

Cited by 2 publications

References 10 publications

Semi-Blind Post-Equalizer SINR Estimation and Dual CSI Feedback for Radar-Cellular Coexistence

Semi-Blind Post-Equalizer SINR Estimation and Dual CSI Feedback for Radar-Cellular Coexistence

A Comprehensive Study of Past, Present, and Future of Spectrum Sharing and Information Embedding Techniques in Joint Wireless Communication and Radar Systems

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