Related Experiment Video
Updated: Jun 13, 2025

09:43
Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
Published on: March 20, 2017
9.8K
Asynchronous Code Division Multiplexing-Based Visible Light Positioning and Communication Network Using Successive
Zhongxu Liu1, Xiaodi You2, Changyuan Yu1
1Department of Electrical and Electronic Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong 999077, China.
Sensors (Basel, Switzerland)
|September 14, 2024
Summary
This study introduces a new method for visible light positioning and communication (VLPC) networks. It significantly improves data accuracy and positioning in asynchronous systems.
Area of Science:
- Wireless Communication
- Optical Technologies
Background:
- Visible Light Positioning and Communication (VLPC) integrates visible light communication (VLC) and visible light positioning (VLP).
- Asynchronous Code Division Multiplexing (ACDM) presents challenges in VLPC network performance.
Purpose of the Study:
- To enhance data transmission quality and positioning accuracy in asynchronous VLPC networks.
- To address the limitations of existing ACDM techniques in VLPC systems.
Main Methods:
- Proposed an orthogonal pseudo-random code (OPRC) to maintain signal orthogonality in asynchronous VLP systems.
- Developed an enhanced ACDM-based VLPC system combining OPRC with successive interference cancellation decoding (SICD).
Main Results:
- OPRC achieved sub-centimeter average positioning errors by preserving signal orthogonality.
- The SICD-OPRC scheme significantly reduced bit-error rate (BER) to 4.3 × 10-4 and average positioning error (PE) to 2.7 cm.
- The proposed scheme demonstrated performance close to synchronized VLPC systems in complex asynchronous scenarios.
Conclusions:
- The SICD-OPRC scheme offers a robust solution for improving VLPC performance in asynchronous environments.
- This advancement is crucial for the development of next-generation wireless communication systems.
Keywords:
asynchronous code division multiplexing (ACDM)successive interference cancellation decoding (SICD)visible light positioning (VLP)visible light positioning and communication (VLPC)More Related Videos
Related Concept Videos
Network Function of a Circuit
270
Frequency response analysis in electrical circuits provides vital insights into a circuit's behavior as the frequency of the input signal changes. The transfer function, a mathematical tool, is instrumental in understanding this behavior. It defines the relationship between phasor output and input and comes in four types: voltage gain, current gain, transfer impedance, and transfer admittance. The critical components of the transfer function are the poles and zeros.
270
Deconvolution
141
Deconvolution, also known as inverse filtering, is the process of extracting the impulse response from known input and output signals. This technique is vital in scenarios where the system's characteristics are unknown, and they must be inferred from the observable signals.
Deconvolution involves several mathematical techniques to derive the impulse response. One common approach is polynomial division. In this method, the input and output sequences are treated as coefficients of...
Deconvolution involves several mathematical techniques to derive the impulse response. One common approach is polynomial division. In this method, the input and output sequences are treated as coefficients of...
141
Design Example
321
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
321
Electronic Distance Measuring Instruments
29
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
29
Directional Relays
101
Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
101
Reconstruction of Signal using Interpolation
179
Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
179

