Performance Analysis of Different Modulation Schemes for Coherent Optical OFDM System

Wang, Zhiyong; Xie, Xinglong; Zhao, Jinting; Tong, Zhengrong; Yang, Xiufeng

doi:10.1109/cmc.2010.289

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…Figure 5 demonstrates that the performance of lower modulated LTE systems supersedes that of higher order modulated systems [20]. Hence it can be deduced that, though employing higher order modulation schemes can offer better bandwidth efficiency [21], that result comes at the expense of poorer BER performance. A closer look at the plots reveal that though 4x4 configuration guarantees diversity gain a combination 2x2 configuration and 16QAM provides better SNR saving than 4x4 and 64QAM therefore adaptive modulation may be an option to efficiently enjoy trade-off between diversity gain and the bandwidth efficiency [22].…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

BER Performance of 2x2 and 4x4 Transmit Diversity MIMO in Downlink LTE

Uyoata¹,

Noras²

2014

IJCA

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Multi-antenna(MIMO) techniques are reported to improve the performance of radio communication systems in terms of their capacity and spectral efficiency. In combination with appropriate receiver technologies they can also provide savings in the required transmit power with respect to target bit error rate. Long Term Evolution(LTE), one of the candidates for fourth generation(4G) mobile communication systems has MIMO as one of its underlying technologies and ITU defined channel models for its propagating environment. This paper undertakes a comprehensive verification of the performance of transmit diversity MIMO in the downlink sector of LTE. It uses models built using MATLAB to carry out simulations. It is deduced that generally increasing transmit diversity configuration from 2x2 to 4x4 offers SNR savings in flat fading channels though with a user equipment moving at 30km/hr, deploying 2x2 offers higher SNR saving below 7dB. Furthermore bandwidth variation has minimal effect on the BER performance of transmit MIMO except at SNR values above 9dB while the gains of higher modulation schemes come with a transmit power penalty.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

BER Performance of 2x2 and 4x4 Transmit Diversity MIMO in Downlink LTE

Uyoata¹,

Noras²

2014

IJCA

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“…Zhiyong Wang et.al showed [4] the relationship between BER and OSNR using different digital modulation schemes such as 2-PSK and 4-QAM up to 16 QAM to improve bandwidth efficiency [7]. He has considered 128 subcarriers and 10 GB/s transmission speed.…”

Section: Effect On System Of Modulation Formatmentioning

confidence: 99%

An efficient modulation technique to mitigate nonlinearities in optical OFDM

Rahman

Abdullah

Alam

et al. 2014

2014 Australasian Telecommunication Networks and Applications Conference (ATNAC)

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The optical OFDM (O-OFDM) system is a growing technology for next generation high-speed optical communication. Two types of O-OFDM; CO-OFDM (CoherentOptical OFDM) and Direct-current-based optical OFDM (DC-OFDM) are discussed. Mach-Zehnder modulators (MZMs) are used in up-converter part of CO-OFDM system to convert the RF signal to optical signal when the light cannot directly modulate for higher speed. The MZM has a cosine behavior with high nonlinear characteristic that affects the system performance. This paper aims to investigate an efficient pulse modulation technique for mitigating nonlinearity effect in the Mach-Zehnder modulator of CO-OFDM system. It also highlights the proposed method, an efficient CO-OFDM system to solve the existing nonlinearity issue. This technique influences positively on OSNR to reduce non linearity over different distances of optical channel and improve the system performance in terms of power consumption and bandwidth efficiency.

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“…Moreover, in OFDM these parallel streams are modulated by using one type of modulation such as, QAM, BPSK, and QPSK. [9]. The main factor behind the use of OFDM In modern radio norms is the high spectral efficiency that provides due to the presence of subcarriers which are orthogonal to each other.…”

Section: Co-ofdm System Principlementioning

confidence: 99%

Alleviation of Nonlinear Impact Using PAPR Hybrid Technique in CO-OFDM Systems

Al-Hashime¹,

Satar²,

Al–Suhail³

et al. 2019

Adv. sci. technol. eng. syst. j.

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Orthogonal Frequency Division Multiplexing (OFDM) is a modulation format that has recently attracted lots of consideration interior the long-haul fiber-optic transmission community. The most important advantage of optical OOFDM is its unlimited capability of canceling Inter-Symbol Interference (ISI) caused by Chromatic Dispersion (CD) and Polarization-Mode Dispersion (PMD). Specifically, Coherent OOFDM (CO-OFDM) presents a good and effective modulation method in modern optical communication systems. However, due to its high Peak to Average Power Ratio (PAPR), the performance of CO-OFDM is affected by nonlinear impairments. In this paper, we propose a new joint nonlinear technique; L3-by-3; with a distortion technique; clipping ; that bypass the requirement for the use of any side information (SI) to minimize the high PAPR value of the transmitted signal and consequently improve various fiber nonlinear impacts through PAPR reduction. The simulation results reveal dependable and excellent signal recapture at the receiver and an effectively minimized PAPR level at the sender side.

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Performance Analysis of Different Modulation Schemes for Coherent Optical OFDM System

Cited by 10 publications

References 7 publications

BER Performance of 2x2 and 4x4 Transmit Diversity MIMO in Downlink LTE

BER Performance of 2x2 and 4x4 Transmit Diversity MIMO in Downlink LTE

An efficient modulation technique to mitigate nonlinearities in optical OFDM

Alleviation of Nonlinear Impact Using PAPR Hybrid Technique in CO-OFDM Systems

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