Integrated visible light communication and positioning CDMA system employing modified ZCZ and Walsh code

Chen, Danyang; Fan, Kai; Wang, Jianping; Lu, Huimin; Jin, Jianli; Feng, Lifang; Chen, Hongyao; Xue, Zhuo; Wang, Yufeng

doi:10.1364/oe.474687

Cited by 10 publications

(4 citation statements)

References 38 publications

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“…With FDM, VLC and VLP signals occupy distinct frequency subcarriers for simultaneous transmission and positioning [9][10][11][12][13]. CDM assigns unique spreading codes to VLC and VLP signals, which are then differentiated through despreading codes [8,14,15]. However, commercial LEDs typically offer a narrow bandwidth, often just a few megahertz.…”

Section: Introductionmentioning

confidence: 99%

Integrated Mobile Visible Light Communication and Positioning Systems Based on Decision Feedback Channel Estimation

Wang,

Sun,

Liu

et al. 2024

Photonics

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Visible light communication (VLC) and visible light positioning (VLP) systems are usually designed separately to prevent mutual interference, while terminal mobility often introduces challenges that can degrade their performance. In this paper, we propose an integrated visible light communication and positioning (VLCP) scheme designed for mobile scenarios, encompassing both multiple-input–single-output (MISO) and multiple-input–multiple-output (MIMO) configurations. This scheme integrates both functionalities into a unified system. Utilizing decision feedback channel estimation (DFCE), we effectively estimate the dynamic channel state information (CSI) for both VLC and VLP, thereby potentially enhancing both communication and positioning performance. Simulation results across various routes verify the effectiveness of the proposed scheme. It is observed that when the terminal moves at 1 m/s, the VLCP scheme with DFCE can maintain reliable transmission quality, ensuring bit error rates (BERs) consistently below 1.3 × 10−2. Additionally, the mean positioning errors remain within the centimeter range in different routes, not exceeding 4.3 cm and 15.5 cm in the MISO and MIMO scenarios, respectively.

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Section: Introductionmentioning

confidence: 99%

Integrated Mobile Visible Light Communication and Positioning Systems Based on Decision Feedback Channel Estimation

Wang,

Sun,

Liu

et al. 2024

Photonics

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“…Additionally, they introduced a CDMA scheme enabling multiple access with variable data rates [16]. In [17], the authors proposed an integrated visible light communication and posi- tioning CDMA system. This system achieved a transmission rate of 1 Mbps and an average positioning error of 1.50 cm.…”

Section: Introductionmentioning

confidence: 99%

Experimental Verification of a Multiuser Detection Technique for Asynchronous UOWC Systems

Liu,

Chen,

Huang

et al. 2024

IEEE Photonics J.

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In this paper, a multiuser detection technique is proposed and experimentally verified in underwater optical wireless communication (UOWC) under dynamic channel conditions, which incorporates subspace-based delay estimation and decorrelating multiuser detection methods for an asynchronous access system. The subspace-based delay estimation method necessitates only prior knowledge of user spreading codes. The decorrelating multiuser detector can suppress multiple access interference (MAI) and demonstrates superior detection performance in a dynamic channel. An underwater testbench that supports three-user asynchronous access is established to further validate the multiuser detection technique. Experimental results demonstrate the effectiveness of alleviating the negative effects of user asynchrony, MAI, and intensity fluctuation.

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“…This reduces the time and spectral utilization. As for the CDM-based VLCP system, a set of spreading codes is divided and assigned to LEDs to distinguish different VLCP signals, then the correlation values between the spreading codes and the VLCP signals are used to recover the user data for VLC and calculate receiver signal strength (RSS) for VLP [19,20]. However, it is hard for the CDM-based solution to support a large number of users because each LED can only support the VLC function for one user, which means the number of LEDs limits the user number.…”

Section: Introductionmentioning

confidence: 99%

Multi-User Visible Light Communication and Positioning System Based on Dual-Domain Multiplexing Scheme

Liu

Chen

2023

Photonics

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Visible light communication and positioning (VLCP) is a promising candidate for constructing a multi-functional wireless network with large-scale connectivity and centimeter-level positioning. However, there is still a lack of effective methods to offer simultaneous visible light communication (VLC) and visible light positioning (VLP) functions for multiple users. Thus, we propose a multi-user VLCP system based on a dual-domain multiplexing (DDM) scheme, where both the time and code resources are multiplexed to transmit VLCP signals for multiple users simultaneously. In the proposed system, the data of different users are distinguished by using code division multiplexing technology, while the VLCP signals transmitted from different LEDs are separated by adopting time division multiplexing technology. The performances, including bit-error rate and positioning error, are evaluated through both simulation and experimentation to verify the feasibility of the proposed multi-user VLCP system. In the experiment, a VLCP system with four LED transmitters was able to simultaneously support low-speed VLC with free error and accurate VLP with a 2 cm precision for eight users. This offers an effective solution to support a large number of users with simultaneous VLC and VLP functions in the future multi-functional wireless network.

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Integrated visible light communication and positioning CDMA system employing modified ZCZ and Walsh code

Cited by 10 publications

References 38 publications

Integrated Mobile Visible Light Communication and Positioning Systems Based on Decision Feedback Channel Estimation

Integrated Mobile Visible Light Communication and Positioning Systems Based on Decision Feedback Channel Estimation

Experimental Verification of a Multiuser Detection Technique for Asynchronous UOWC Systems

Multi-User Visible Light Communication and Positioning System Based on Dual-Domain Multiplexing Scheme

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