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Indoor Optical Wireless Communications-Based Differential Modulation and Low-Density Parity-Check Coding


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DOI: https://doi.org/10.15866/iremos.v16i4.23393

Abstract


This paper considers indoor Optical Wireless Communication (OWC) channel modeling. Time delay spread, rms delay spread along with the channel impulse response, and channel frequency response are evaluated and presented. The presence of multiple reflections from walls, doors, and room furniture in the channel model leads to multipath fading. As a consequence, this multipath fading causes the signal to become time-dispersed, eventually resulting in a deterioration of the Bit Error Ratio (BER). To overcome this challenge, a Low-Density Parity-Check coding (LDPC), as standardized in the Fifth Generation (5G) wireless system, is implemented for Differential Phase-Shift Keying (DPSK) with various code rates. The performance of transmission of 4 DPSK and 8 DPSK coded with LDPC over an indoor OWC was evaluated for the first time. Bit Error Ratio (BER) results show that, even in differential encoding, LDPC performs very well in indoor OWC, providing low cost and less complexity. The proposed approach achieves a gain of 7.75 dB of SNR at a BER of 10-5 using ½ rate LDPC and 4 DPSK. ½ code rate offers superior results for both 4 DPSK and 8 DPSK.
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Keywords


Differential Phase-Shift Keying Modulation (DPSK); Bit Error Ratio (BER); Low-Density Parity-Check (LDPC) Codes; Optical Wireless Communications (OWC); Signal-To-Noise Ratio (SNR)

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References


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