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[IEEE 2018 International Conference on Wireless Communications, Signal Processing and Networking (WiSPNET) - Chennai, India (2018.3.22-2018.3.24)] 2018 International Conference on Wireless Communications, Signal Processing and Networking (WiSPNET) - Integration of Visible Light Communication and Fiber Communication System
摘要： In this paper, we present an integrated fiber and visible light communication (VLC) system with both single and multimode fibers. Before establishing the fiber–VLC link, we implement a fiber link alone and achieve least BER for a particular length of the fiber. This fiber length is taken as an optimum performing link. The main performance measure utilized in this paper is the Bit Error Rate (BER). Optimum performance is achieved at the point of minimum BER. For an optimum performing fiber–VLC link, the dispersion is analyzed and the compensation of chromatic dispersion is done using ideal dispersion compensation Fiber Bragg Grating (FBG). Utilizing the Gray coded input sequence instead of direct binary sequence reduces the BER, since adjacent constellation points will only differ in one bit. The BER results for 16 QAM (Quadrature Amplitude Modulation) and 64 QAM using Orthogonal Frequency Division Multiplexing (OFDM) are compared for both single mode fiber and multimode fiber links. The simulation results show that for Single Mode Fiber–VLC (SMF–VLC) link the dispersion compensation is better when compared to the Multi Mode Fiber–VLC (MMF–VLC) link.
关键词： Dispersion Compensation FBG,BER,fiber–VLC link,Gray coded input,SMF–VLC,MMF–VLC
更新于2025-09-09 09:28:46
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[Lecture Notes in Electrical Engineering] Recent Trends in Communication, Computing, and Electronics Volume 524 (Select Proceedings of IC3E 2018) || Performance Optimization of Carving Signal RZ-DQPSK Modulation Scheme
摘要： This paper depicts a modi?ed return-to-zero differential quadrature phase shift keying (RZ-DQPSK) modulation scheme. A simulative analysis has been performed for an optimization of the proposed scheme. The analysis has also been extended for two different types of commercial ?bers; standard single-mode ?ber (SSMF) and true wave-reduced slope (TW-RS) ?ber to report the similar qualitative performance characteristics. For the sake of better understanding of the proposed modi?ed carving signal RZ-DQPSK scheme, optical spectrum and eye pattern plots are also investigated.
关键词： Bit error rate (BER),Quality factor,True wave-reduced slope ?ber (TW-RS),Eye pattern,Return-to-zero differential quadrature phase shift keying (RZ-DQPSK)
更新于2025-09-09 09:28:46
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Comparison of Modulation Techniques for Underwater Optical Wireless Communication Employing APD Receivers
摘要： In this study, we theoretically analyze the performance of an underwater optical wireless communications system using different modulation techniques and an avalanche photodiode APD receiver over underwater environment channels. Based on the LOS geometrical model and combined with signal to noise ratio model for Si and Ge APD and BER; then the impact of the distance of transmission and power of the transmitter and Jerlov water type are analyzed. The characteristics of bit error rate BER for different optical modulation techniques are studied. Simulation results indicate that the performance of H-QAM is more suited for an underwater optical wireless communication. On the other hand, the suitability of avalanche photodiodes under these modulation techniques is discussed, because the photodiode Si APD has more advantages compared with Ge APD when used in an underwater optical communication.
关键词： Avalanche photodiode APD,modulation,underwater optical communication,bit error rate BER
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - Nara, Japan (2018.10.9-2018.10.12)] 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - BER Performance Impaired by Transmission Time Offset between Users in Optical Wireless CSK/ACDMA System Using DMPOMs
摘要： An optical-wireless code-shift-keying (CSK) system utilizing dual modified pseudo orthogonal M-sequence sets (DMPOMs) has been proposed by authors. DMPOM is generated by merging modified pseudo orthogonal M-sequence sets (outer-code), bi-orthogonal code and orthogonal M-sequences (inner-code). In this paper, bit error rate (BER) of the optical-wireless CSK/asynchronous CDMA is investigated in 2-user communication. Consequently, for the realization of the CSK/CDMA, it is effective to utilize the inner codes generated by different feedback taps.
关键词： optical-wireless,bit error rate (BER),code-shift-keying (CSK),dual modified pseudo orthogonal M-sequence sets (DMPOMs),asynchronous CDMA (ACDMA)
更新于2025-09-04 15:30:14
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Minimum BER Power Allocation for Space-Time Coded Generalized Frequency Division Multiplexing Systems
摘要： In this letter, we propose a minimum BER (MBER) power allocation (PA) method for generalized frequency division multiplexing (GFDM) systems with zero forcing (ZF) receiver. The MBER PA of GFDM systems is solved through minimizing noise enhancement factor (NEF) at the receiver. Additionally, theoretical BER and achievable rate (AR) expressions are derived with the proposed PA strategy. Furthermore, we also generalize the MBER PA strategy in space-time coded (STC) GFDM systems. Simulation results show that, no matter GFDM or STC GFDM systems, the proposed PA strategy could improve BER and AR performances simultaneously.
关键词： minimum BER,generalized frequency division multiplexing (GFDM),space-time code,power allocation (PA),achievable rate (AR)
更新于2025-09-04 15:30:14