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2-D Optical-CDMA Modulation With Hard-Limiting for Automotive Time-of-Flight LiDAR | IEEE Journals & Magazine | IEEE Xplore

2-D Optical-CDMA Modulation With Hard-Limiting for Automotive Time-of-Flight LiDAR


Abstract:

In this proof-of-principle paper, the application of 2-D optical code-division multiple-access (OCDMA) modulation to long-range automotive time-of-flight (ToF) light dete...Show More

Abstract:

In this proof-of-principle paper, the application of 2-D optical code-division multiple-access (OCDMA) modulation to long-range automotive time-of-flight (ToF) light detection and ranging (LiDAR) is studied. The regulations and physical constraints that govern the design parameters are reviewed. Using 2-D carrier-hopping prime codes (CHPCs), the modulation model and a novel 2-D hard-limiting decoder are designed and validated with OptiSystem^{\rm {TM}} simulations. Based on the design parameters, the 2-D CHPCs have six times as many distinct sequences (for sensor identification) as 1-D code sequences. Analytical and simulation studies show that the proposed 2-D OCDMA modulation model can eliminate the near-far (power) problem and support more LiDAR sensors with distinctive ToF tags, greater interference robustness for more simultaneous ToF measurements, and better performance than the 1-D counterparts. The simulation results show that the 2-D model can support four times as many simultaneous emitting sensors without false detections as the 1-D model. In summary, the 2-D OCDMA modulation has more benefits and is more cost efficient overall, even though it is more complex.
Published in: IEEE Photonics Journal ( Volume: 13, Issue: 6, December 2021)
Article Sequence Number: 7200111
Date of Publication: 08 October 2021

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