2D Generalized Optical Spatial Modulation for MIMO-OWC Systems

Chen, Chen; Zeng, Lin; Zhong, Xin; Fu, Shu; Zeng, Zhihong; Liu, Min; Haas, Harald

doi:10.1109/jphot.2022.3192651

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…The multiple input multiple output (MIMO) system, renowned for its capability to improve spectral efficiency and enhance link reliability, has emerged as a prevalent technology in contemporary wireless communication standards [2]. Compared to single input single output (SISO) systems, MIMO systems effectively utilize spatial resources and augment channel capacity without requiring additional bandwidth because each receiver antenna can simultaneously receive signals transmitted by all transmitting antennas [3]. With the growing demand for high data rate communication networks, Mazo demonstrated in 1975 that higher transmission rates could be achieved using faster-than-Nyquist (FTN) technology [4].…”

Section: Introductionmentioning

confidence: 99%

A MIMO Detector With Deep-Neural-Network for Faster-Than-Nyquist Optical Wireless Communications

Cao,

Yao,

Sun

et al. 2024

IEEE Photonics J.

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Conventional multiple input multiple output (MIMO) detection algorithms face challenges related to computational complexity and limited performance when handling high-dimensional inputs and complex channel conditions. In order to enhance signal recovery accuracy in atmospheric turbulence channels for faster-than-Nyquist (FTN) optical wireless communication (OWC) systems, a deep learning (DL) based MIMO detector is proposed. By leveraging a deep neural network (DNN), it becomes possible to learn nonlinear mappings within MIMO systems, resulting in improved detection performance while reducing computational overheads. Simulation results validate that our proposed DNN detector achieves comparable performance to the maximum likelihood (ML) method, while reducing complexity by 40%.

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Section: Introductionmentioning

confidence: 99%

A MIMO Detector With Deep-Neural-Network for Faster-Than-Nyquist Optical Wireless Communications

Cao,

Yao,

Sun

et al. 2024

IEEE Photonics J.

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“…Advanced modulation formats that can effectively utilize the available bandwidth have been extensively investigated in VLC systems [7,8]. In addition, the advanced transmission schemes, such as the multipleinput multiple-output (MIMO) architecture, can also be deployed in VLC to enhance the system capacity under the fixed modulation bandwidth [9].…”

Section: Introductionmentioning

confidence: 99%

A Novel OFDM-Based Time Domain Quadrature GSM for Visible Light Communication System

Shi,

Miao,

Pang

et al. 2023

Electronics

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In order to improve the spectral efficiency (SE) as well as the receiver performance of band-limited visible light communications (VLCs), two orthogonal frequency division multiplexing (OFDM)-based quadrature generalized multiple-input multiple-output (QG-MIMO) transmission schemes, including time domain (TD) quadrature generalized spatial modulation (TD-QGSM) and TD quadrature generalized spatial multiplexing (TD-QGSMP), are proposed in this paper. Firstly, the constellation symbols in the frequency domain are split into in-phase and quadrature components to perform the OFDM modulation separately. Then, the corresponding time domain signal is spatially mapped on different light emitting diodes (LEDs) for achieving the diversity or multiplexing. In addition, we also propose an illegal vector correction (IVC)-based orthogonal matching pursuit (OMP) detection algorithm to deal with the error propagation and noise amplification effect, where a novel correction criterion is involved for assisting the index vectors estimation and thus for improving the demodulation performance. The simulation results demonstrate that the SE can be significantly improved by the proposed schemes as compared with the existing OFDM-based generalized MIMO schemes, with the TD-QGSM increasing by at least 56.5% and the TD-QGSMP increasing by at least 72.3%. Moreover, the bit error rate (BER) performance can be further improved when applying the proposed IVC-OMP detection method, which outperforms the traditional maximum-likelihood and maximum ratio combining (ML-MRC) detection by at least 62.5%.

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“…Lately, a pulse amplitude modulation (PAM)-based two-dimensional (2D) GOSM scheme has been applied in MIMO-OWC systems, where the 2D GOSM mapping is conducted not only in the spatial domain but also in the time domain. 12 Nevertheless, LED selection can only be conducted for the entire PAM symbol in 2D GOSM, since the PAM symbol does not have the imaginary part. Compared with the real-valued PAM modulation, OFDM modulation using complex-valued quadrature amplitude modulation (QAM) constellation can enjoy the benefit of separately exploiting the in-phase and quadrature degrees of the complex-valued input constellation symbols for LED selection.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is just a one-dimensional (1D) scheme, which cannot fully exploit the resources from other dimensions. Lately, a pulse amplitude modulation (PAM)-based two-dimensional (2D) GOSM scheme has been applied in MIMO-OWC systems, where the 2D GOSM mapping is conducted not only in the spatial domain but also in the time domain 12 . Nevertheless, LED selection can only be conducted for the entire PAM symbol in 2D GOSM, since the PAM symbol does not have the imaginary part.…”

Section: Introductionmentioning

confidence: 99%

OFDM-based 2D generalized optical quadrature spatial modulation for MIMO-OWC systems

Qiu¹,

Xu²,

Shen³

et al. 2022

Opt. Eng.

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An innovative scheme, named orthogonal frequency division multiplexing (OFDM)-based two-dimensional (2D) generalized optical quadrature spatial modulation (GOQSM), is proposed for bandlimited multiple-input multiple-output optical wireless communication (MIMO-OWC) systems. In this scheme, by way of combining two consecutive time slots into one time block, 2D GOQSM mapping can be executed in spatial domain and time domain. Therefore, more spatial bits can be transmitted, resulting in the increase of system spectral efficiency. Furthermore, discrete Fourier transform (DFT) spreading is further introduced in OFDM-based 2D GOQSM systems, so as to substantially reduce the peak-to-average power ratio (PAPR) of the transmitted signals. To evaluate and compare the performance of OFDMbased 2D GOQSM systems with other traditional systems, numerical simulations are conducted under various spectral efficiencies. The obtained simulation results prove that the proposed OFDM-based 2D GOQSM scheme with DFT spreading can achieve better bit error rate performance and lower PAPR than other benchmark schemes.

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2D Generalized Optical Spatial Modulation for MIMO-OWC Systems

Cited by 6 publications

References 14 publications

A MIMO Detector With Deep-Neural-Network for Faster-Than-Nyquist Optical Wireless Communications

A MIMO Detector With Deep-Neural-Network for Faster-Than-Nyquist Optical Wireless Communications

A Novel OFDM-Based Time Domain Quadrature GSM for Visible Light Communication System

OFDM-based 2D generalized optical quadrature spatial modulation for MIMO-OWC systems

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