scholarly journals Generation of (3, 1) Vector Signal Based on Probabilistic Shaping Technology without Precoding

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Jiangnan Xiao ◽  
Xu Dong ◽  
Bo Liu ◽  
Xingxing Feng ◽  
Chuang Zhao ◽  
...  
Keyword(s):  
Forward Error Correction ◽  
Single Mode ◽  
Optical Carrier ◽  
Error Ratio ◽  
Bit Error Ratio ◽  
Optical Carrier Suppression ◽  
Forward Error ◽  
Rf Signal ◽  
Vector Signal ◽  
Better Than

In this paper, we introduce the probabilistic shaping (PS) technique to the normal (3, 1) vector signal and simulate the generated PS (3, 1) photonic vector signal on an optical transmission system. The PS (3, 1) photonic vector signal is generated by a radio frequency (RF) signal at 12 GHz driving a Mach–Zehnder modulator- (MZM-) based optical carrier suppression (OCS) doubling, and the PS (3, 1) photonic vector signal is not precoding. The PS (3, 1) photonic vector signal and the normal (3, 1) photonic vector signal are used to transmit in 5 km, 10 km, and 20 km single-mode fibers (SMF), respectively. The simulation results demonstrate that the bit error ratio (BER) of the PS (3, 1) vector signal is less than the forward error correction (FEC) threshold of 3.8  ×  10−3, and the BER performance is better than that of the normal (3, 1) vector signal at 4 Gbit/s and 8 Gbit/s transmission rates.

A Proposed Nonbinary Network Codes Applied in Wireless Broadcast

2014 ◽  
Vol 644-650 ◽  
pp. 4167-4173
Author(s):  
Wei Chen ◽  
Jun Wu ◽  
Xin Lin Huang
Keyword(s):  
Forward Error Correction ◽  
Network Code ◽  
Base Station ◽  
Delay Performance ◽  
Wireless Broadcast ◽  
Common Information ◽  
Broadcast Network ◽  
Error Ratio ◽  
Network Codes ◽  
Forward Error

This paper proposes a new method of applying nonbinary network coding in wireless broadcast network. This network consists of T(T>2) users who receive common information independently from a common base station (BS). We assume that the transmission blocks are subject to block-fading with independent fading coefficients for each block, nonbinary network codes over finite fields are used on top of channel codes.We take two kinds of schemes, with ACK and without ACK, into consideration. In the first situation while considering ACK mechanism, the forward error correction (FEC) and retransmitted techniques are used and network code (NC) can diminish the retransmit count significantly. In the second situation while utilizing broadcast nature without ACK, the NC could help to rebuild losing packets, thus decrease block error ratio.We analyze the delay performance and block error ratio, and verify the analytical performance with simulation. Both simulation and analysis confirm the advantage of proposed scheme.

OFDM Vector Signal Generation Based on Optical Carrier Suppression

2015 ◽  
Vol 27 (23) ◽  
pp. 2449-2452 ◽  
Author(s):  
Jiangnan Xiao ◽  
Ziran Zhang ◽  
Xinying Li ◽  
Yuming Xu ◽  
Long Chen ◽  
...  
Keyword(s):  
Signal Generation ◽  
Optical Carrier ◽  
Optical Carrier Suppression ◽  
Vector Signal

Efficient Discrete Simulation of Coded Wireless Communication Systems

2010 ◽  
pp. 143-177 ◽  
Author(s):  
Pedro J.A. Sebastião ◽  
Francisco A.B. Cercas ◽  
Adolfo V.T. Cartaxo
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Forward Error Correction ◽  
Channel Model ◽  
Additive White Gaussian Noise ◽  
Simulation Method ◽  
Potential Range ◽  
Soft Decision ◽  
Bit Error Ratio ◽  
Forward Error

Simulation can be a valuable tool for wireless communication system’s (WCS) designers to assess the performance of its radio interface. It is common to use the Monte Carlo simulation method (MCSM), although this is quite time inefficient, especially when it involves forward error correction (FEC) with very low bit error ratio (BER). New techniques were developed to efficiently evaluate the performance of the new class of TCH (Tomlinson, Cercas, Hughes) codes in an additive white Gaussian noise (AWGN) channel, due to their potential range of applications. These techniques were previously applied using a satellite channel model developed by Lutz with very good results. In this chapter, we present a simulation method, named accelerated simulation method (ASM), that provides a high degree of efficiency and accuracy, namely for lower BER, where the application of methods like the MCSM is prohibitive, due to high computational and time requirements. The present work generalizes the application of the ASM to a WCS modelled as a stochastic discrete channel model, considering a real channel, where there are several random effects that result in random energy fluctuations of the received symbols. The performance of the coded WCS is assessed efficiently, with soft-decision (SD) and hard-decision (HD) decoding. We show that this new method already achieves a time efficiency of two or three orders of magnitude for SD and HD, considering a BER = 1x10-4 , when compared to MCSM. The presented performance results are compared with the MCSM, to check its accuracy.

scholarly journals 300-GHz-band wireless communication using a low phase noise photonic source

2020 ◽  
Vol 12 (7) ◽  
pp. 551-558
Author(s):  
L. Yi ◽  
K. Iwamoto ◽  
T. Yamamoto ◽  
F. Ayano ◽  
A. Rolland ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Phase Noise ◽  
Forward Error Correction ◽  
Brillouin Scattering ◽  
Frequency Comb ◽  
Communication Link ◽  
Optical Carrier ◽  
Shift Keying ◽  
Forward Error ◽  
Low Phase Noise

AbstractThe implementation of advanced multi-level modulation schemes such as quadrature phase-shift keying (QPSK) in contrast to the conventional on–off keying is crucial to further boost the terahertz (THz) communications speed. Thereby, carrier phase noise reduction in the THz range is one of the key goals that need to be urgently achieved. In this paper, the photonic-based THz sources and the phase noise problem are briefly summarized. Then, a low phase-noise photonic source based on the stimulated Brillouin scattering (SBS) optical fiber cavity is first applied for a 300-GHz-band QPSK wireless communication link. The highest data rate at forward-error-correction limited condition was 15 Gbaud utilizing the SBS-based photonic source with a small transmit power of ~ −36 dBm. Its transmission characteristics are evaluated and compared with the conventional optical frequency comb generator (OFCG)-based source at 5 Gbaud. The proposed SBS-based photonic source has been proven to offer better performances than the OFCG-based source with respect to the phase noise, optical carrier to noise ratio, and bit error rate in communications.

scholarly journals Faster-Than-Nyquist 400 G Implementation Using 126-GBaud QPSK-OFDM With 88-GSa/s Undersampling

2021 ◽  
Vol 9 ◽  
Author(s):  
Peng Liu ◽  
Hongxian Chen ◽  
Weihao Ni ◽  
Fan Li
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Forward Error Correction ◽  
Sampling Rate ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Mobile Internet ◽  
Optical Carrier ◽  
Low Frequencies ◽  
Ofdm Signal ◽  
Internet Of Things Technology

In this study, we demonstrated generation and transmission of 114 Gbaud and 126 Gbaud faster-than-Nyquist (FTN) discrete Fourier transform-spread (DFT-spread) quadrature phase shift keying orthogonal frequency division multiplexing (QPSK-OFDM) with 88-Gsa/s sampling rate digital-to-analog converters (DACs) experimentally. It is the first time to realize 400G FTN DFT-spread QPSK-OFDM signal per optical carrier for metro and regional applications, which will be a solution for network operators to address the issue of increasing bandwidth derived from the rapid popularization of mobile Internet and the wide application of IoT (Internet of Things technology). Delay-and-add filter (DAF) is adopted to realize frequency shaping at the transmitter to keep higher portions of energy of signal at low frequencies, which makes the OFDM much more robust to strong filtering effect. After pre-equalization, bit error rate (BER) performance of 114 GBaud and 126 GBaud FTN DFT-spread QPSK-OFDM has been significantly improved, and maximum-likelihood sequence estimation (MLSE) shows a better effect than binary decoding in the aspect of against the inter symbol interference (ISI) introduced by spectrum compression. The effective bit rate of dual polarization 126 Gbaud FTN DFT-spread QPSK-OFDM which is generated with 88 GSa/s sampling rate is 410.08 Gb/s, to the exclusion of all overhead including TSs, cyclic prefix (CP), and 20% forward error correction (FEC) coding. We successfully transmit 8 × 400 Gbit/s FTN DFT-spread QPSK-OFDM signal generated from 88 Gsa/s sampling rate DAC over 420 km single mode fiber (SMF) with the BER under 2.4 × 10−2.

QAM Vector Signal Generation by Optical Carrier Suppression and Precoding Techniques

2015 ◽  
Vol 27 (18) ◽  
pp. 1977-1980 ◽  
Author(s):  
Xinying Li ◽  
Jianjun Yu ◽  
Junwen Zhang ◽  
Jiangnan Xiao ◽  
Ziran Zhang ◽  
...  
Keyword(s):  
Signal Generation ◽  
Optical Carrier ◽  
Optical Carrier Suppression ◽  
Vector Signal

Photonic Vector Signal Generation Employing a Single-Drive MZM-Based Optical Carrier Suppression Without Precoding

2015 ◽  
Vol 33 (24) ◽  
pp. 5235-5241 ◽  
Author(s):  
Yuanquan Wang ◽  
Jianjun Yu ◽  
Xinying Li ◽  
Yuming Xu ◽  
Nan Chi ◽  
...  
Keyword(s):  
Signal Generation ◽  
Optical Carrier ◽  
Optical Carrier Suppression ◽  
Vector Signal
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