scholarly journals Mixed-Carrier Communication for Technology Division Multiplexing

Electronics ◽  
2021 ◽  
Vol 10 (18) ◽  
pp. 2248
Author(s):  
Ahmed F. Hussein ◽  
Dola Saha ◽  
Hany Elgala
Keyword(s):  
High Speed ◽  
Forward Error Correction ◽  
Complexity Analysis ◽  
Signal To Noise Ratio ◽  
Visible Light Communication ◽  
Trade Offs ◽  
Wide Range ◽  
Shift Keying ◽  
Forward Error ◽  
Carrier Communication

Recently, research on sixth-generation (6G) networks has gained significant interest. 6G is expected to enable a wide-range of applications that fifth-generation (5G) networks will not be able to serve reliably, such as tactile Internet. Additionally, 6G is expected to offer Terabits per second (Tbps) data rates, 10 times lower latency, and near 100% coverage, compared to 5G. Thus, 6G is expected to expand across all available spectrums including terahertz (THz) and optical frequency bands. In this manuscript, mixed-carrier communication (MCC) is investigated as a novel physical layer (PHY) design for 6G networks. The proposed MCC version in this study is based on visible light communication (VLC). MCC enables a unified transmission PHY design to connect devices with different complexities, simultaneously. The design trade-offs and the required signal-to-noise ratio (SNR) per individual modulation schemes embedded within MCC are investigated. The complexity analysis shows that a conventional optical OFDM receiver can capture the high-speed bit-stream embedded within MCC. For a forward error correction (FEC) bit-error-rate (BER) threshold of 3.8×10−3, MCC is optimized to maximize the spectral efficiency by embedding 2-beacon phase-shift keying (2-BnPSK) within an MCC envelope on top of 12 bits per beacon position modulation (BPM) symbol.

scholarly journals Entropy Loading Design for the MIMO-OFDM Visible Light Communication System Using the OCT Precoding Technique

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Xinyue Guo ◽  
Haimeng Zhao ◽  
Wei Wang
Keyword(s):  
Visible Light ◽  
Orthogonal Frequency Division Multiplexing ◽  
Forward Error Correction ◽  
Signal To Noise Ratio ◽  
Multiple Input Multiple Output ◽  
Visible Light Communication ◽  
Circulant Matrix ◽  
Available Bandwidth ◽  
Mimo Ofdm ◽  
Forward Error

In this paper, an orthogonal circulant matrix transform (OCT) precoding technique is proposed to combine with the entropy loading in the multiple-input multiple-output and orthogonal frequency division multiplexing (MIMO-OFDM) visible light communication (VLC) system where the space-time coding (STBC) is chosen for its robustness to the channel correlation. Benefitting from the OCT precoding technique, the uniform signal-to-noise ratio (SNR) among all the subchannels can be achieved. As a result, only one SNR value is required to be fed back, and the same distribution matcher is employed during probabilistic shaping (PS), which means much lower feedback overhead and system complexity than the conventional entropy loading scheme. Experimental results show that the OCT precoding does not cause the system performance loss where the achievable information rate (AIR) of the proposed system is comparable with the conventional system without precoding. With an available bandwidth of ∼25 MHz, the proposed scheme can realize the AIR of 50.75 Mb/s at the expense of 0.45% average forward error correction (FEC) overhead (OH).

scholarly journals Experimental Investigation of Zadoff-Chu Matrix Precoding for Visible Light Communication System with OFDM Modulation

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Xinyue Guo ◽  
Yang Guo ◽  
Shuangshuang Li
Keyword(s):  
Visible Light ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Forward Error Correction ◽  
Signal To Noise Ratio ◽  
Light Emitting Diode ◽  
Average Power ◽  
Visible Light Communication ◽  
Potential Candidate ◽  
Ofdm Modulation

Light-emitting diode- (LED-) based visible light communication (VLC) has become a potential candidate for next generation high-speed indoor wireless communication. Due to the limited modulation bandwidth of the LED, orthogonal frequency division multiplexing (OFDM) modulation is particularly preferred in the VLC system to overcome the ISI, which suffers from the high peak-to-average power ratio (PAPR) and leads to severe performance loss. In this paper, we propose and experimentally demonstrate a novel Zadoff-Chu matrix (ZCM) precoding scheme, which can not only reduce the PAPR, but also provide uniform signal-to-noise ratio (SNR) profile. The theoretical analysis and simulation show that the proposed scheme achieves better PAPR performance compared with the traditional precoding schemes. The experimental demonstration further validates the bit error rate (BER) performance improvement, where the measured BERs are all below the 7% pre-forward error correction (pre-FEC) limit of 3.8 × 10−3 when the transmitted data rate is 50 Mb/s.

scholarly journals Post-FEC Performance of Pilot-Aided Carrier Phase Estimation over Cycle Slip

2019 ◽  
Vol 9 (13) ◽  
pp. 2749 ◽  
Author(s):  
Yan Li ◽  
Quanyan Ning ◽  
Lei Yue ◽  
Honghang Zhou ◽  
Chao Gao ◽  
...  
Keyword(s):  
Carrier Phase ◽  
Forward Error Correction ◽  
Optical Signal ◽  
Phase Estimation ◽  
Cycle Slip ◽  
Phase Shift Keying ◽  
Filter Length ◽  
Shift Keying ◽  
Phase Unwrap ◽  
Forward Error

The POST-forward error correction (FEC) bit error rate (BER) performance and the cycle-slip (CS) probability of the carrier phase estimation (CPE) scheme based on Viterbi–Viterbi phase estimation (VVPE) algorithm and the VV cascaded by pilot-aided-phase-unwrap (PAPU) algorithm have been experimentally investigated in a 56 Gbit/s quadrature phase-shift keying (QPSK) coherent communication system. Experimental results show that, with 0.78% pilot overhead, the VVPE + PAPU scheme greatly improves the POST-FEC performance degraded by continuous CS, maintaining a low CS probability with less influence of filter length. Comparing with the VVPE scheme, the VVPE + PAPU scheme can respectively obtain about 3.1 dB, 1.3 dB, 0.6 dB PRE-FEC optical signal noise ratio (OSNR) gains at PRE-BER of 1.8 × 10−2. Meanwhile, the VVPE + PAPU scheme respectively achieves about 3 dB, 1 dB, and 0.5 dB POST-FEC OSNR gain and improves the FEC limit from 2.5 × 10−3 to 1.4 × 10−2, from 8.9 × 10−3 to 1.8 × 10−2, and from 1.6 × 10−2 to 1.9 × 10−2 under the CPE filter length of 8, 16, and 20.

scholarly journals Design and spectral analysis of mixed-carrier communication for sixth-generation networks

2020 ◽  
Vol 476 (2238) ◽  
pp. 20200165
Author(s):  
Ahmed F. Hussein ◽  
Hany Elgala
Keyword(s):  
Signal To Noise Ratio ◽  
Design Procedure ◽  
Optical Power ◽  
Spectrum Management ◽  
Visible Light Communications ◽  
Experimental Proof ◽  
Millimetre Wave ◽  
Trade Offs ◽  
Sixth Generation ◽  
Carrier Communication

The fifth-generation (5G) wireless cellular network is expected to be ready for commercialization within this year. The huge spectrum enabled by the millimetre-wave (mm-Wave) technology is expected to introduce a hype in data usage per user. The 5G is also expected to concurrently support a wide variety of services; however, the practical trade-offs associated with concurrent services require further investigations. In this work, a physical layer (PHY) design to support visible light communications is considered to efficiently support concurrent services that are essential to serve the needs of the sixth-generation (6G) network. A novel communication technique, i.e. mixed-carrier communication (MCC), is proposed. MCC enables simultaneous wireless services such as broadband access, low-rate internet-of-things connectivity, device-free sensing, and device-based localization. This study presents, firstly, a thorough investigation of the design procedure of the novel MCC PHY, secondly, the spectral profile of MCC towards proper spectrum management and interference analysis, and thirdly, performance evaluation based on modelling, simulation and an experimental proof-of-concept. The design steps recommend that the system performance degrades beyond a signal-to-noise ratio (SNR) threshold. For instance, SNR of 25.1 dB and 2.6652 optical power ratio between the communications signal and the driving envelope, for 64-quadrature amplitude modulation (64-QAM), are recommended to avoid performance degradation due to clipping. Simulation results show an interference-immune performance of a properly managed spectrum. For a bit-error-rate (BER) of 10 −3 , an SNR penalty of 2–5 dB is observed for different interference scenarios. The experimental measurements illustrate a high-quality signal of 21 dB SNR at 50 cm and 10 −3 BER using 64-QAM.

Reconfigurable Forward Error Correction Decoder for Beyond 100 Gbps High Speed Optical Links

2015 ◽  
Vol 19 (2) ◽  
pp. 119-122 ◽  
Author(s):  
Bomin Li ◽  
Knud J. Larsen ◽  
Darko Zibar ◽  
Idelfonso Tafur Monroy
Keyword(s):  
Error Correction ◽  
High Speed ◽  
Forward Error Correction ◽  
Optical Links ◽  
Forward Error

scholarly journals About Digital Communication Methods for Visible Light Communication

2021 ◽  
Vol 13 (03) ◽  
pp. 01-13
Author(s):  
Wataru Uemura ◽  
Yasuhiro Fukumori ◽  
Takato Hayama
Keyword(s):  
Visible Light ◽  
High Speed ◽  
Pulse Wave ◽  
Low Voltage ◽  
Threshold Value ◽  
Visible Light Communication ◽  
Wave Modulation ◽  
Wide Range ◽  
Pulse Wave Modulation ◽  
Communication Methods

The visible light communication (VLC) by LED is one of the important communication methods because LED can work as high speed and VLC sends the information by high flushing LED. We use the pulse wave modulation for the VLC with LED because LED can be controlled easily by the microcontroller, which has the digital output pins. At the pulse wave modulation, deciding the high and low voltage by the middle voltage when the receiving signal level is amplified is equal to deciding it by the threshold voltage without amplification. In this paper, we proposed two methods that adjust the threshold value using counting the slot number and measuring the signal level. The number of signal slots is constant per one symbol when we use Pulse Position Modulation (PPM). If the number of received signal slots per one symbol time is less than the theoretical value, that means the threshold value is higher than the optimal value. If it is more than the theoretical value, that means the threshold value is lower. So, we can adjust the threshold value using the number of received signal slots. At the second proposed method, the average received signal level is not equal to the signal level because there is a ratio between the number of high slots and low slots. So, we can calculate the threshold value from the average received signal level and the slot ratio. Unfortunately, the first proposed method adjusts the threshold value after receiving the data, once the distance between the sender and the receiver is changed, then the performance becomes worse. And after adjusting the threshold, the performance becomes better. Therefore, this method should be used in stable environments. The second proposed method can change the threshold value during the signal is received. That means this method can work very quickly. So, this method can show good performance for the wide range. We show these performances as real experiments.

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