Universidade Federal do Ceará
Programa de Pós-Graduação em Engenharia de Teleinformática

Título: From monostatic to bistatic ISAC: A study on angular estimation, transmit precoding and probabilistic constellation shaping

Data: 30/07/2025
Horário: 14:00
Local: Sala de Seminários do GTEL, Bloco 722

Banca Examinadora:
Francisco Rodrigo Porto Cavalcanti (UFC, Orientador)
Walter da Cruz Freitas Junior (UFC)
Vicente Angelo de Sousa Junior (UFRN)

Resumo:
This work explores different facets of Integrated Sensing and Communication (ISAC) through a progressive study of monostatic and bistatic configurations. Initially, we propose a low-complexity angular estimation algorithm for disconnected targets in monostatic multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems, comparing its performance against the classical multiple signal classification (MUSIC) algorithm. The proposed method demonstrates a favorable trade-off between accuracy and computational complexity, making it suitable for 5G-like ISAC scenarios with limited sensing resources. Building upon this, we investigate a bistatic ISAC system involving multiple user equipments and a sensing target. We formulate and solve an optimization problem to design a transmission precoder that balances localization accuracy and communication quality of service. Performance is assessed using metrics such as the normalized root Cramér-Rao lower bound (CRLB), signal-to-interference-to-noise ratio (SINR), and detection probability. Finally, we explore a symbol-level bistatic ISAC system that integrates communication and sensing via a shared waveform. By leveraging probabilistic constellation shaping (PCS) and optimizing the transmitter filter, we improve the trade-off between detection and communication performance. Results indicate that PCS outperforms conventional multibeam techniques in enhancing sensing capabilities while maintaining communication reliability, even under channel correlation conditions.

Palavras-chave: integrated sensing and communications; mobile communications; wireless communication systems; wireless sensing; 6G.