University of Twente Student Theses
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Optimizing Energy-Efficiency in Cell-Free Massive MIMO : A Two-Phase PRACH and OFDM-Based Monostatic Sensing Protocol
Zhou, A. (2025) Optimizing Energy-Efficiency in Cell-Free Massive MIMO : A Two-Phase PRACH and OFDM-Based Monostatic Sensing Protocol.
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| Full Text Status: | Access to this publication is restricted |
| Embargo date: | 31 August 2025 |
| Abstract: | As the sixth generation (6G) of mobile networks approaches, a fundamental shift is occurring where communication infrastructure must not only transmit data but also sense and understand its environment. This aims to support advanced applications such as autonomous mobility, industrial automation, and extended reality by enabling both data exchange and environmental awareness. A fundamental requirement in these systems is the ability to localize users with high precision, low latency, and minimal energy overhead. However, accurate and scalable positioning in energy-constrained deployments remains a significant challenge. Existing techniques often rely on dedicated positioning signals or frequent uplink transmissions, leading to increased energy consumption at the user equipment and unnecessary activation of infrastructure. These limitations hinders the adoption of positioning in large-scale, distributed wireless networks. This thesis proposes a two-phase positioning protocol for wireless sensing scenarios in 6G networks. In the first phase, an uplink preamble signal is used to obtain a coarse estimate of the user equipment's position while selectively activating a small number of transmission-reception points based on signal-to-noise ratio and estimated range. The second phase refines the positioning estimation from the first phase by employing monostatic sensing using orthogonal frequency-division multiplexing waveforms, with two beamforming strategies: beam-focusing and beam-sweeping. |
| Item Type: | Essay (Bachelor) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 50 technical science in general, 53 electrotechnology |
| Programme: | Electrical Engineering BSc (56953) |
| Link to this item: | https://purl.utwente.nl/essays/107930 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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