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Multiuser Retroreflective Optical ISAC: Waveform Design, Joint Sensing and Multiple Access
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DOI：10.1109/JLT.2025.3642513.png)
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Abstract
En 中文
Optical wireless integrated sensing and communication (ISAC) has revealed great potential to satisfy the requirements of both large communication capacity and high sensing accuracy in the sixth-generation (6G) networks. In this paper, we propose and experimentally demonstrate a multiuser retroreflective optical ISAC (MU-RO-ISAC) system. To simultaneously support communication and sensing for multiple users, a novel orthogonal frequency division multiplexing-embedded maximum length sequence with code index modulation (OFDM-MLS-CIM) waveform is proposed. Utilizing the proposed OFDM-MLS-CIM waveform, multiuser joint sensing and multiple access schemes are further designed accordingly. Compared with pure OFDM, OFDM-MLS-CIM can support flexible performance trade-off between communication and sensing and it can also transmit additional index bits via CIM during MLS generation. Proof-of-concept experiments are conducted to evaluate the feasibility of the proposed MU-RO-ISAC system using OFDM-MLS-CIM. Experimental results show that, in a two-user RO-ISAC system, the users' bit error rates (BERs) can reach the 7% forward error correction (FEC) coding threshold of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$3.8 \times 10^{-3}$</tex-math></inline-formula> while centimeter accuracy ranging can be successfully achieved for both users.
Keywords:
Interference cancellation
joint sensing
multiple access
retroreflective optical integrated sensing and communication (RO-ISAC)
waveform design
Journal
IF:
4.8
Papers:
1.7W
Citations:
3.8W
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