University of Illinois Urbana-Champaign

On Secrecy Capacity of Binary Beampointing Channels with Block Memory and Feedback

Li, Siyao; Chen, Mingzhe; Li, Shuangyang; Caire, Giuseppe

Permalink

https://hdl.handle.net/2142/130259

Description

Title
On Secrecy Capacity of Binary Beampointing Channels with Block Memory and Feedback
Author(s)
  • Li, Siyao
  • Chen, Mingzhe
  • Li, Shuangyang
  • Caire, Giuseppe
Issue Date
2025-09-17
Keyword(s)
  • 6G
  • Millimeter-wave
  • Joint communication and sensing
  • Secrecy capacity
  • Channel with feedback
Abstract
This paper investigates the secrecy capacity of the binary beampointing (BBP) channel with block memory and feedback, a simplified yet insightful model for millimeter-wave (mmWave) systems with beamformed transmissions and backscatter feedback. We consider a system where a legitimate receiver and a passive eavesdropper experience independent and uniformly distributed angular directions over transmission blocks, with the base station receiving noiseless, unit-delayed feedback from both, under the per-symbol input cost constraints. We establish a closed-form upper bound on the secrecy capacity, which is based on the main channel between the base station and the legitimate receiver. Moreover, we propose a joint communication and adaptive sensing (JCAS) scheme and derive its achievable secrecy rate. Simulation results show that the gap between the inner and outer bounds narrows as the number of block length increases. This reveals the efficiency of this JCAS scheme, which strategically leverages feedback to balance the demands of sensing the legitimate user and preventing information leakage to the eavesdropper.
Publisher
Allerton Conference on Communication, Control, and Computing
Series/Report Name or Number
2025 61st Allerton Conference on Communication, Control, and Computing Proceedings
ISSN
2836-4503
Type of Resource
Text
Genre of Resource
Conference Paper/Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/130259
Copyright and License Information
Copyright 2025 owned by the authors.

Owning Collections

61st Allerton Conference - 2025 PRIMARY
Allerton Conference on Communication, Control, and Computing, 1977-present