MDPSK-Based Nonequalization OFDM for Coherent Free-Space Optical Communication

Chen, Chen; Zhong, Wen‐De; Li, Xiang; Wu, Dehao

doi:10.1109/lpt.2014.2329133

Cited by 22 publications

(8 citation statements)

References 9 publications

(14 reference statements)

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“…Multilevel DPSK modulated non-equalization OFDM system with a coherent detection system is presented in Chen et al 2014, quadrature amplitude modulated OFDM with tunable optical coherent detection is analyzed. Extension of (Wang et al 2015) is given in (Wang et al 2016), where a multihop coherent OFDM FSO system is implemented with an M-QAM modulation scheme with DF relaying technique with gamma-gamma distribution.…”

Section: Background and Motivationmentioning

confidence: 99%

Analysis of the performance of coded and un-coded mixed RF and multihop coherent OFDM-FSO systems for 5G-CRAN applications

Anbarasi

Sangeetha²,

Hemanth³

2022

Opt Quant Electron

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The performance of coded and uncoded mixed single-hop RF links and multihop FSO link systems for the 5G centralized radio access network (C-RAN) is investigated in this paper using a coherent detection technique. A generalized Nakagami-m fading channel is chosen for the RF link, and the Gamma-Gamma distribution channel is chosen for the FSO link. The RF and FSO links use M-Quadrature Amplitude Modulated Orthogonal Frequency Division Multiplexing (M-QAM OFDM) modulation for the coherent detection scheme. The Meijer-G function is used to calculate outage probability (OP) and average symbol error rate (ASER) for analyzing the performance of coded and uncoded systems. Reed Solomon (RS) and Bose-Chaudhuri-Hocquenghem (BCH) codes are used in the coded system. In relays, the decode and forward (DF) method is used. For analysis, the effects of atmospheric turbulence, atmospheric loss, and pointing error are considered. The results show that the coding technique improves the system's performance. When compared to BCH codes, RS codes improve system performance more. A Monte-Carlo simulation is used to validate the analytical results.

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Section: Background and Motivationmentioning

confidence: 99%

Analysis of the performance of coded and un-coded mixed RF and multihop coherent OFDM-FSO systems for 5G-CRAN applications

Anbarasi

Sangeetha²,

Hemanth³

2022

Opt Quant Electron

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“…As to MPAM, it is difficult to obtain the precise knowledge of atmospheric turbulence channel state information in practical application [4]. Regarding MDPSK, it is evident that the precise control of a one-bit delay interferometer is difficult in case of the transmission of variable data rates [5]. As to MPolSK, the different state of polarizations (SOPs) are estimated through the symbol-by-symbol calculation of Stokes parameters, which are detected by multiple-photodiodes (PDs) [6], [7].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Spectral Efficiency FSO Links Using Linear Polarizer-Based MLPolSK Detection

2020

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This paper proposes the enhancement of spectral efficiency (SE) by linear polarizer based multilevel linear polarization shift keying (MLPolSK) detection in free-space optical (FSO) communication. At the transmitter end, in order to improve SE of FSO links, the various linear state of polarizations (SOPs) with an equal magnitude-spacing of x-or y-polarization are modulated for MLPolSK signal. At the receiver end, the cascaded polarization-independent semiconductor optical amplifier (SOA) and linear polarizer are introduced to detect MLPolSK signal. Polarization-independent SOA is applied to effectively mitigate the turbulence induced scintillation effect by the gain saturation without the distortion of polarization. Linear polarizer with high extinction ratio (ER) is used to transform various SOPs into the signal with an equal intensity-spacing of x-or y-polarization. Besides, the amplified spontaneous emission (ASE) noises are reduced by the polarization of ASE noises by linear polarizer. Finally, MLPolSK is detected by a single photodiode (PD) and decided by multilevel-thresholdings. In experiments, the performance of the proposed technique is evaluated under turbulence channels, which are emulated using Mach-Zehnder modulator (MZM)-based fading simulator. Experimental results show that the SE is improved up to 3 bit/s/Hz under the effective scintillation mitigation using the proposed technique. INDEX TERMS Multilevel linear polarization shift keying, spectral efficiency, polarization-independent semiconductor optical amplifier, linear polarizer, free space optical communication.

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“…indoor attocells, FSO systems communicate over much larger distances and encounter commensurately longer CIRs, which is beneficially counteracted by the anti-dispersion capability of ACO-OFDM, as argued in [21]- [24].…”

Section: Introductionmentioning

confidence: 99%

Aperture Selection for ACO-OFDM in Free-Space Optical Turbulence Channel

Jiang

Zhang

et al. 2016

IEEE Trans. Veh. Technol.

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Abstract-We propose a novel aperture selection (ApS) scheme for asymmetrically clipped optical orthogonal frequency-division multiplexing (ACO-OFDM) based multiple transmit/receive aperture (MTRA) system communicating over a free-space optical (FSO) turbulence channel between a pair of cooperating base-stations in a vehicular communication system. Our proposed ApS scheme is capable of significantly improving both the system's achievable diversity gain, its bit error ratio as well as its throughput, while imposing a substantially reduced power consumption and hardware complexity. Our results demonstrate that the proposed system's performance was improved more significantly under strongly turbulent channel conditions. Index Terms-Free-space optical turbulence channel, asymmetrically clipped optical orthogonal frequencydivision multiplexing, multiple transmit/receive aperture, aperture selection

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MDPSK-Based Nonequalization OFDM for Coherent Free-Space Optical Communication

Cited by 22 publications

References 9 publications

Analysis of the performance of coded and un-coded mixed RF and multihop coherent OFDM-FSO systems for 5G-CRAN applications

Analysis of the performance of coded and un-coded mixed RF and multihop coherent OFDM-FSO systems for 5G-CRAN applications

Enhancement of Spectral Efficiency FSO Links Using Linear Polarizer-Based MLPolSK Detection

Aperture Selection for ACO-OFDM in Free-Space Optical Turbulence Channel

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