scholarly journals BER performance study for optical OFDM of optical camera communication

2021 ◽  
Vol 11 (5) ◽  
pp. 4263
Author(s):  
Noor J. Jihad ◽  
Sinan M. Abdul Satar
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Signal To Noise Ratio ◽  
Frequency Division ◽  
Performance Study ◽  
Mapping Rule ◽  
Bit Loading ◽  
Dc Bias ◽  
Optical Ofdm ◽  
Ber Performance ◽  
Optical Camera Communication

In this article, different forms of optical orthogonal frequency division multiplexing (OFDM) were observed which were suitable for optical camera communication (OCC) systems. This research aims to establish the bit error rate (BER) versus signal-to-noise ratio (SNR) of the OCC system. This research will focus on OCC systems and the design that produces the noise of the clipping but will gain SNR as a whole if an optimum clipping factor is chosen. The BER versus SNR analysis was investigated for the different clipping factors 0.7, 1.4, and 2.6. The BER performance of the asymmetrically clipped optical OFDM (ACO-OFDM) was also compared with the direct current optical OFDM (DCO-OFDM) to show the suitable effectiveness of the proposed approach. ACO-OFDM was considered to be better due to lower bit loading, but DCO-OFDM was efficient for higher SNR values. This was because the DC bias used was inefficient in terms of optical capacity, while ACO-OFDM used only half of the subcarriers to transmit the information. Moreover, ACO-OFDM two-dimensional half-subcarriers of mapping rule would introduce the clipping noise to its unused 2D subcarriers, although further data can be provided by the 2D DCO-OFDM mapping rule.

Simulative Effect of Cyclic Prefix in Optical OFDM

2014 ◽  
Vol 661 ◽  
pp. 190-194
Author(s):  
A.O. Aldhaibani ◽  
S.A. Aljunid ◽  
Mohd Shamsul Anuar ◽  
A.R. Arief ◽  
H.Y. Ahmed
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Signal To Noise Ratio ◽  
Transmission Efficiency ◽  
Cyclic Prefix ◽  
Frequency Division ◽  
Interference Effects ◽  
Ofdm System ◽  
Guard Interval ◽  
Optical Ofdm ◽  
Simulation Results

Orthogonal frequency division multiplexing (OFDM) is one of the Multi-Carrier Modulation (MCM) techniques that transmit signals through multiple carriers. These carriers (subcarriers) have different frequencies and they are orthogonal to each other. There are different parameters which alter the performance of OFDM system. In this paper, the effect of cyclic prefix length (CP) on optical (OFDM) system is investigated. Although employing a CP as the guard interval is a simple way to combat inter-symbol interference (ISI) and inter-carrier interference (ICI), it reduces the transmission efficiency of the system. The simulation results show the effect of CP length in power receiver, penalty of power and improved the performance based on signal to noise ratio (SNR). In addition, a tradeoff is needed between reduced interference effects and transmission efficiency.

scholarly journals Turbo Decoder for Low-Power Ultrawideband Communication Systems

2008 ◽  
Vol 2008 ◽  
pp. 1-7 ◽  
Author(s):  
Esam A. Obiedat ◽  
Lei Cao
Keyword(s):  
Computational Complexity ◽  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Signal To Noise Ratio ◽  
Turbo Decoding ◽  
Ofdm Symbol ◽  
Turbo Decoder ◽  
Multicarrier Systems ◽  
Ultrawideband Communication ◽  
Ber Performance

A new method to reduce the computational complexity of the turbo decoding in ultrawideband (UWB) orthogonal frequency division multiplexing (OFDM) system is proposed. Existing stopping techniques for turbo decoding process using constrained decoding assume fixed signal-to-noise ratio (SNR) for all the OFDM symbol bits so they fail to yield an acceptable bit-error rate (BER) performance in multicarrier systems. In this paper, we propose a bit-level stopping technique for turbo decoding process based on the constrained decoding method. In this technique, we combine the cyclic redundancy check (CRC) with an adaptive threshold on the log likelihood ratio (LLR) on each subcarrier to detect for convergence. The threshold is adaptive in the sense that the threshold on the LLR of a bit is determined by the average SNR of the OFDM symbol and the channel gain of the transmission subcarrier. Results show that when the channel state information (CSI) is used to determine the threshold on LLR, the stopping technique can reduce the computational complexity by about 0.5–2.5 equivalent iterations compared to GENIE turbo without degradation in the BER performance.

Key Technologies for Optical OFDM in Optical Long-Haul System Using Direct-Detection

2015 ◽  
Vol 719-720 ◽  
pp. 845-850
Author(s):  
Yi Tang ◽  
Ping Xing Feng
Keyword(s):  
Theoretical Model ◽  
Channel Estimation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Direct Detection ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Single Sideband ◽  
Key Technologies ◽  
Optical Single Sideband ◽  
Optical Ofdm

A comprehensive theoretical model of direct detection (DD) optical orthogonal frequency division multiplexing (OOFDM) system is described in general. The principle of OOFDM is introduced in detail. Several key technologies in DD-OOFDM system have been discussed. The advantages and methods for optical single sideband (OSSB) and channel estimation are analyzed completely. Other key technologies are introduced briefly.

CO-OFDM System with 16-QAM Subcarrier Modulation Using Reconfigurable Optical Add Drop Multiplexer

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Aruna Rani ◽  
Manjit Singh Bhamrah ◽  
Sanjeev Dewra
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Optical Switch ◽  
Signal To Noise Ratio ◽  
Optical Power ◽  
Optical Signal ◽  
Signal Power ◽  
Frequency Division ◽  
Link Length ◽  
Transmission Distance ◽  
Fiber Link

AbstractIn this paper, sixteen 50 GHz spaced orthogonal frequency division multiplexing channels at 10 Gbps has been investigated with reconfigurable optical add drop multiplexer based on digital optical switch. The effects of fiber link length and input optical signal power on bit error rate, quality factor, output signal power, optical signal to noise ratio at the receiving side are observed. It is observed that maximal transmission distance of 2,100 km is achieved with an input optical power of −8 dBm.

Comparison and Analysis of DCO-OFDM, ACO-OFDM and ADO-OFDM in IM/DD Systems

2014 ◽  
Vol 701-702 ◽  
pp. 1059-1062 ◽  
Author(s):  
Xu Zhang ◽  
Yu Fang Zhou ◽  
Yin Peng Yu ◽  
Peng Chao Han ◽  
Xiao Rui Wang
Keyword(s):  
Optical Communication ◽  
Orthogonal Frequency Division Multiplexing ◽  
Direct Detection ◽  
Optical Power ◽  
Frequency Division ◽  
Optical Efficiency ◽  
Power Efficient ◽  
Optical Ofdm ◽  
And Performance ◽  
Ofdm Signals

As a promising modulation technology for optical communication, Orthogonal Frequency Division Multiplexing (OFDM) is now increasingly used and a lot of ways of improving the optical efficiency of Intensity Modulated/ Direct Detection (IM/DD) systems have been proposed. And real and non-negative OFDM signals are required in this kind of system. Asymmetrically clipped DC biased Optical OFDM (DCO-OFDM), Asymmetrically Clipped Optical OFDM (ACO-OFDM) and Asymmetrically clipped DC biased Optical OFDM (ADO-OFDM) can satisfy this requirement. In this paper, we analysis the properties and performance orderly of the above three systems and simultaneously compare their performance. The simulation results show that DCO-OFDM is efficient in terms of bandwidth while the ACO-OFDM is efficient in terms of optical power. More importantly, ADO-OFDM is both power-efficient and bandwidth-efficient. At the same time, a developmentally proposal for the future OFDM in IM/DD systems is put forward.

PAPR reduction scheme for optical OFDM techniques

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ompal Singh ◽  
Rajeev Paulus ◽  
Rajiv Srivastava
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Average Power ◽  
Optical Fiber Communication ◽  
Papr Reduction ◽  
Channel Noise ◽  
Optical Wireless ◽  
Fiber Communication ◽  
Optical Ofdm ◽  
The Mathematical Model ◽  
Ber Performance

AbstractIn both optical wireless and optical fiber communication, orthogonal frequency division multiplexing (OFDM) plays an important role in data transmission. In the similar context, DC-coupled optical (DCO) OFDM and asymmetrically clipped optical (ACO) OFDM are discussed. DCO-OFDM has better peak to average power ratio (PAPR) but bit error rate (BER) performance is poor; however, in case of ACO-OFDM, PAPR is poor but BER performance is good. Moreover, DCO-OFDM is more power hungry; therefore, ACO-OFDM is considered as a preferred choice. Recently, asymmetrically clipped DC-biased optical (ADO)-OFDM is proposed, which shows good PAPR and BER performance. Clipping and µ-law companding techniques are discussed for PAPR reduction. The mathematical model is developed for all the three methods for received signal while considering clipping and companding noises along with channel noise. It is found that ADO-OFDM is better choice in comparison to DCO and ACO-OFDM. However, in case of ADO-OFDM, receiver structure is more complex.

scholarly journals Residual Clipping Noise in Multi-layer Optical OFDM: Modeling, Analysis, and Application

2020 ◽  
Author(s):  
Zhenyu Zhang ◽  
Anas Chaaban ◽  
Mohamed-Slim Alouini
Keyword(s):  
Spectral Efficiency ◽  
Orthogonal Frequency Division Multiplexing ◽  
Single Layer ◽  
Symbol Error Rate ◽  
Frequency Division ◽  
Accurate Evaluation ◽  
Accurate Model ◽  
Modeling Analysis ◽  
Symbol Detection ◽  
Optical Ofdm

Optical orthogonal frequency division multiplexing (O-OFDM) schemes are variations of OFDM schemes which produce non-negative signals. Asymmetrically-clipped O-OFDM (ACO-OFDM) is a single-layer O-OFDM scheme, whose spectral efficiency can be enhanced by adopting multiple ACO-OFDM layers or a combination of ACO-OFDM and other O-OFDM schemes. However, since symbol detection in such enhanced ACO-OFDM (eACO-OFDM) is done iteratively, erroneous detection leads to residual clipping noise (RCN) which can degrade performance in practice. Thus, it is important to develop an accurate model for RCN which can be used to design RCN-aware eACO-OFDM schemes. To this end, this paper provides a mathematical analysis of RCN leading to an accurate model of RCN power. The obtained model is used to analyze the performance of various eACO-OFDM schemes. It is shown that the model provides an accurate evaluation of symbol error rate (SER), which would be underestimated if RCN is ignored. Moreover, the model is shown to be useful for designing an RCN-aware resource allocation that increases the robustness of the system in terms of meeting a target SER, compared to an RCN-unaware design.

scholarly journals Performance on FBMC-OQAM and OFDM Multicarrier Systems

2019 ◽  
Vol 8 (10) ◽  
pp. 1564-1568
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Filter Bank ◽  
Signal To Noise Ratio ◽  
Cyclic Prefix ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Signal To Noise ◽  
Multicarrier Systems ◽  
Noise Ratio ◽  
Power Equality

Filter Bank Multi Carrier (FBMC) offers best detestable properties took a gander at over orthogonal frequency division multiplexing (OFDM) to the attack of nonexistent hindrance. FBMC system is a multicarrier structure, particularly sensible for 5G remote correspondences. FBMC beats OFDM as a result of proficient use of the open information move limit and without usage of cyclic prefix (CP). In this paper, we address the issue of remarkable enrollment at the pilot territory and used to audit the channels with pilot picture, in like way consider the fundamental conditions for utilization of the assistant pilot pictures. First and two partner pictures for each pilot plans with power equality uses instead of one picture; it can attainable inspirations driving necessity of OFDM and FBMC depending upon signal to noise ratio (SNR) what's relentlessly possible to improve the introduction of one frivolity pictures by using multiple associate pictures. Finally autonomous the BER execution reenactment results and adornment pilot pictures

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