Performance Evaluation of MPPM-Coded Wireless Optical MIMO System with Combined Effects over Correlated Fading Channel

Zhang, Yue; Wang, Huiqin; Cao, Maoyong; Bao, Zhongxian

doi:10.1155/2020/7983812

Cited by 9 publications

(6 citation statements)

References 24 publications

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“…In addition, modulated QPSK has the characteristics of high spectrum utilization and strong anti-interference [21]. Therefore, combining the PPM and QPSK can improve the data transmission rate and the system reliability [22,23].…”

Section: System Modelmentioning

confidence: 99%

LSTM Attention Neural-Network-Based Signal Detection for Hybrid Modulated Faster-Than-Nyquist Optical Wireless Communications

Cao

Yao

Jieping

et al. 2022

Sensors

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In order to improve the accuracy of signal recovery after transmitting over atmospheric turbulence channel, a deep-learning-based signal detection method is proposed for a faster-than-Nyquist (FTN) hybrid modulated optical wireless communication (OWC) system. It takes advantage of the long short-term memory (LSTM) network in the recurrent neural network (RNN) to alleviate the interdependence problem of adjacent symbols. Moreover, an LSTM attention decoder is constructed by employing the attention mechanism, which can alleviate the shortcomings in conventional LSTM. The simulation results show that the bit error rate (BER) performance of the proposed LSTM attention neural network is 1 dB better than that of the back propagation (BP) neural network and outperforms by 2.5 dB when compared with the maximum likelihood sequence estimation (MLSE) detection method.

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Section: System Modelmentioning

confidence: 99%

LSTM Attention Neural-Network-Based Signal Detection for Hybrid Modulated Faster-Than-Nyquist Optical Wireless Communications

Cao

Yao

Jieping

et al. 2022

Sensors

Self Cite

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“…Further research shows that MPPM scheme could benefit the MIMO-FSO communication systems more when MIMO systems were less correlated [10]. In 2020, the BER performance and Ergodic channel capacity of MPPMcoded wireless optical communication (WOC) MIMO systems over correlated fading channel suffering from negative impacts of atmospheric turbulence, atmospheric attenuation, and pointing error were investigated by Yue et al [11].…”

Section: Introductionmentioning

confidence: 99%

Analysis on improving channel capacity of MPPM

Ke¹

2023

HSET

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Nowadays, optical wireless communication has been widely applied and various techniques are used to achieve signals with higher quality and higher efficiency. Pulse position modulation (PPM) is a commonly used modulation scheme. However, PPM suffers from its low bandwidth efficiency and Multiple pulse position modulation (MPPM) is generated to improve the performance of signals. Further research can be carried out to figure out ways to further improve channel capacity of communication systems by combining modulation techniques together. In this paper, three different schemes are introduced, including LDPC-coded MPPM UWOC system, MIMO-MPPM WOC system, and PSM-MPPM system. Fundamental principles of these three techniques are mentioned before going through the methods used to carrying out experiments. Both simulations derived from numerical analysis and experiment results are obtained to support the results. In LDPC-coded and MIMO research, turbulence effects are considered by adopting different statistical distributions. The aim of the paper is to compare properties of three recent research and discuss how they can be applied in different scenarios to improve the communication systems.

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“…However, bandwidth efficiency of M-PPM especially for higher values of M is low and its requirement of complex timedomain equalization can be problematic for most FSO links with severe channel conditions [11][12][13]. As such, multi-level modulation schemes such as multi-level pulse amplitude modulation (M-PAM) are preferred for bandwidth limited systems where the transmitted data can take multiple amplitude levels [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of hybrid MPAPM technique for deep‐space optical communications

2021

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A hybrid multiple pulse amplitude and position modulation (H-MPAPM) scheme based on gradual multi-pulse pulse-position modulation (G-MPPM) and multi-level pulse amplitude modulation (M-PAM) schemes is proposed for deep-space optical communication. In this scheme, transmitted information is conveyed by different combinations of the positions and amplitudes of multiple optical pulses. The performance of the proposed scheme with multi-pulse pulse-position modulation (MPPM), G-MPPM and multiple pulse amplitude and position modulation (M-PAPM) schemes in terms of the number of transmitted symbols, data rate, symbol error rate (SER), bit error rate (BER), bandwidth utilization efficiency and power requirements are studied in this work. Our results reveal that, at the same frame size, the proposed scheme allows much more symbols per frame transmission, achieves higher transmission energy and further enhance the bandwidth utilization efficiency of MPPM, G-MPPM and M-PAPM schemes. Moreover, compared to the MPPM and G-MPPM, the proposed scheme achieves lower levels of SERs but at the expense of peak power levels. Furthermore, the proposed scheme outperforms G-MPPM and MPPM schemes by approximately 1 and 2 dB at a BER of 10 −6 , respectively. In addition, the analytical expressions for the BER and SER of the proposed scheme are validated using Monte Carlo (MC) simulations.

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Performance Evaluation of MPPM-Coded Wireless Optical MIMO System with Combined Effects over Correlated Fading Channel

Cited by 9 publications

References 24 publications

LSTM Attention Neural-Network-Based Signal Detection for Hybrid Modulated Faster-Than-Nyquist Optical Wireless Communications

LSTM Attention Neural-Network-Based Signal Detection for Hybrid Modulated Faster-Than-Nyquist Optical Wireless Communications

Analysis on improving channel capacity of MPPM

Performance analysis of hybrid MPAPM technique for deep‐space optical communications

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