Simple Receiving Scheme Based on Balanced Detection for Half-Cycled SSB DD-OFDM Signal

Potential Benefit ◽

Average Power ◽

Guard Band ◽

Ofdm Signal ◽

Channel Interference ◽

Simulation Results ◽

Balanced Detection

In this letter, we proposed a simple balanced-detection reception scheme for the half-cycled single-sideband direct-detected optical orthogonal frequency division multiplexing (HSSB DD-OFDM) signal with decreased guard band. By employing this scheme, each entire OFDM symbol can be recovered perfectly, while the signal-to-signal beat interference (SSBI) can be eliminated, the guard band can be reduced greatly and the tolerance to phase noise induced inter-channel interference (PN-ICI) and potential benefit of low peak to average power (PAPR) are retained. The simulation results demonstrate that a 40 Gbps 16-QAM HSSB DD-OFDM signal was achieved successfully.

A CCM-Based OFDM System with Low PAPR for Sparse Source

Wireless Communications and Mobile Computing ◽

10.1155/2018/8923478 ◽

2018 ◽

Vol 2018 ◽

pp. 1-7

Author(s):

Qinbiao Yang ◽

Zulin Wang ◽

Qin Huang

Keyword(s):

Average Power ◽

Coded Modulation ◽

High Peak ◽

Power Ratio ◽

Frequency Division ◽

Ofdm System ◽

Simulation Results ◽

Clipping And Filtering

Orthogonal frequency division multiplexing (OFDM) usually suffers high peak-to-average power ratio (PAPR). As shown in this paper, PAPR becomes even severe for sparse source due to many identical nonzero frequency OFDM symbols. Thus, this paper introduces compressive coded modulation (CCM) in order to restrain PAPR by reducing identical nonzero frequency symbols for sparse source. As a result, the proposed CCM-based OFDM system, together with iterative clipping and filtering, can efficiently restrain the high PAPR for sparse source. Simulation results show that it outperforms about 4 dB over the traditional OFDM system when source sparsity is 0.1.

Demonstrating the Effect of Using Goppa Coding with Hybrid Selective Mapping and Partial Transmit Sequence Technique for PAPR Reduction in OFDM Systems

Journal of Circuits System and Computers ◽

10.1142/s021812662150095x ◽

2020 ◽

pp. 2150095

Author(s):

Vandana Pundir ◽

Anwar Ahmad

Keyword(s):

Average Power ◽

Power Ratio ◽

Frequency Division ◽

Partial Transmit Sequence ◽

Simulation Results ◽

Power Ratio Reduction ◽

Selective Mapping ◽

Ratio Reduction

Orthogonal Frequency Division Multiplexing is a multi-carrier modulation technique which provides numerous advantages like high spectral efficiency, minimal interference, low multipath fading, etc. But Peak-to-average Power Ratio is a severe challenge in using such multiplexing technique as it introduces distortions in nonlinear devices. Various Peak-to-average Power Ratio reduction techniques have been investigated in the literature to improve the performance of Orthogonal Frequency Division Multiplexing systems. But, each of them suffers either from high complexity or degraded bit error rate or less spectral efficiency. For reducing Peak-to-average Power Ratio more effectively, a hybrid combination of Partial Transmit Sequence with Selective Mapping is detected to show better performance. In this paper, we have combined Goppa coding technique with this hybrid Selective Mapping and Partial Transmit Sequence for further improving the performance. Along with Peak-to-average Power Ratio reduction capability, the proposed technique also has inherent error control mechanism due to the use of coding. Based on the simulation results, we have concluded that the proposed technique provides good amount of Peak-to-average Power Ratio reduction than conventional techniques. The proposed technique is analyzed for different number of Orthogonal Frequency Division Multiplexing symbol candidates for Selective Mapping and different number of block divisions for Partial Transmit Sequence. Further, this technique is simulated for different number of subcarriers and modulation order and the simulation results are compared with each other. The proposed technique also shows better Bit error rate values for high Signal-to-Noise ratio.

A Novel GFDM Waveform Design Based on Cascaded WHT-LWT Transform for the Beyond 5G Wireless Communications

Sensors ◽

10.3390/s21051831 ◽

2021 ◽

Vol 21 (5) ◽

pp. 1831

Author(s):

Meryem Maraş ◽

Elif Nur Ayvaz ◽

Meltem Gömeç ◽

Asuman Savaşcıhabeş ◽

Ali Özen

Keyword(s):

Fading Channels ◽

Communication Systems ◽

Additive White Gaussian Noise ◽

Average Power ◽

Hadamard Transform ◽

Frequency Division ◽

Simulation Results ◽

Walsh Hadamard Transform

In this paper, a new WHT-LWT-GFDM waveform obtained by combining Walsh–Hadamard Transform (WHT), Lifting Wavelet Transform (LWT), and Generalized Frequency Division Multiplexing (GFDM) is presented for use in next-generation wireless communication systems. The proposed approach meets the requirement of 5th-generation (5G) and beyond communication schemes in terms of low latency, low peak-to-average-power ratio (PAPR), and low bit-error rate (BER). To verify the performance of the presented waveform, PAPR and BER simulation results were obtained in additive white Gaussian noise (AWGN) and flat Rayleigh fading channels, and the performance of the proposed system was compared with conventional Orthogonal Frequency Division Multiplexing (OFDM), GFDM, and Walsh–Hadamard transform-based GFDM (WHT-GFDM). Simulation results show that the proposed waveform achieves the best BER and PAPR performances and it provides considerable performance gains over the conventional waveforms.

Simple 2D chaotic remapping scheme for securing optical communication networks

Journal of Engineering ◽

10.31026/j.eng.2019.12.07 ◽

2019 ◽

Vol 25 (12) ◽

pp. 85-95

Author(s):

Hiba Abdel Wahab Jabori ◽

Oday A.L.A Ridha

Keyword(s):

Communication Networks ◽

Physical Layer Security ◽

Chaotic Map ◽

Matrix Multiplication ◽

Average Power ◽

Frequency Division ◽

System A ◽

Ofdm Signal

In this work, a simple and new method is proposed to simultaneously improve the physical layer security and the transmission performance of the optical orthogonal frequency division multiplexing system, by combining orthogonal frequency division multiplexing technique with chaotic theory principles. In the system, a 2-D chaotic map is employed. The introduced system replaces complex operations such as matrix multiplication with simple operations such as multiplexing and inverting. The system performance in terms of bit error rate (BER) and peak to average ratio (PAPR) is enhanced. The system is simulated using Optisystem15 with a MATLAB2016 and for different constellations. The simulation results showed that the BER of an unauthorized receiver reaches 0.5. Furthermore, the peak-to-average-power-ratio (PAPR) of the transmitted OFDM signal can be decreased by about 0.8 dB at BER equal to 10^-4.

Orthogonal frequency-division multiplexing radar signal design with optimised ambiguity function and low peak-to-average power ratio

IET Radar Sonar & Navigation ◽

10.1049/iet-rsn:20080106 ◽

2009 ◽

Vol 3 (2) ◽

pp. 122 ◽

Cited By ~ 38

Author(s):

M.A. Sebt ◽

A. Sheikhi ◽

M.M. Nayebi

Keyword(s):

Average Power ◽

Ambiguity Function ◽

Radar Signal ◽

Power Ratio ◽

Signal Design ◽

Frequency Division

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

Advantages of Spectrally Efficient Frequency Division Multiplexing Over Orthogonal Frequency Division Multiplexing

10.35940/ijitee.h6319.069820 ◽

2020 ◽

Vol 9 (8) ◽

pp. 238-244

Keyword(s):

Average Power ◽

Power Ratio ◽

Frequency Division ◽

Sphere Decoder ◽

Symbol Rate ◽

Transmission Length ◽

Spectrally Efficient ◽

The Impact

An analysis on Spectrally Efficient Frequency Division Multiplexing (SEFDM) is contrast with Orthogonal Frequency Division Multiplexing (OFDM) considering the impact on Peak to Average Power Ratio (PAPR) and nonlinearities within fibre. With respect to OFDM the sub-carriers in SEFDM signals are compressed adjacent to each other at a rate of frequency lesser than the symbol rate. At the receiver end we have utilized the Sphere Decoder which is used to recover the data to remunerate the Interference created by the compressed signals (ICI) faced in the system. This research shows the advantages by using SEFDM and evaluates its achievement. PAPR. when compared with OFDM, while effects of non-linear fibres are considered. The use of various formats of modulation going from 4-QAM to 32-QAM, shows that the SEFDM signals have a noteworthy increment in the transmission length with respect to ordinary signals.

AN EFFICIENT METHOD FOR PAPR REDUCTION IN OFDM SYSTEMS WITH REDUCED COMPLEXITY

International Journal of Electronics and Electical Engineering ◽

10.47893/ijeee.2013.1076 ◽

2013 ◽

pp. 96-100

Author(s):

PRITANJALI KUMARI ◽

US TRIAR

Keyword(s):

Average Power ◽

High Peak ◽

Papr Reduction ◽

Power Calculation ◽

Power Ratio ◽

Frequency Division ◽

Ofdm Systems ◽

Reduced Complexity

Orthogonal Frequency Division Multiplexing (OFDM), widely used in digital wireless communication, has a major drawback of high Peak to Average Power Ratio (PAPR). A reduced complexity partial transmit sequence (PTS) scheme has been proposed to solve high peak to average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) system. In the proposed PTS scheme, a function is generated by summing the power of time domain samples at time ‘n’ in each sub blocks, known as “Hn”.Only those samples, having Hn greater than or equal to a preset threshold value (αT) are used for peak power calculation during the process of selecting a candidate signal with the lowest PAPR for transmission. As compared to conventional PTS scheme, the proposed scheme achieves almost the same PAPR reduction performance with much lower computational complexity.

Dynamic Hyperchaotic Key Generation Using Optical Orthogonal Frequency Division Multiplexing-based Visible Light Communication Networks

10.21203/rs.3.rs-499286/v1 ◽

2021 ◽

Author(s):

Mohammed Alresheedi ◽

YAHYA AL-MOLIKI ◽

Yahya Al-Harthi ◽

Ali Alqahtani

Keyword(s):

Visible Light ◽

Communication Networks ◽

Average Power ◽

Visible Light Communication ◽

Key Generation ◽

Frequency Division ◽

Degree Of Protection ◽

Communication Time

Abstract This paper introduces an optical orthogonal frequency division multiplexing (OFDM)-based hyperchaotic key generation encryption approach that can improve confidentiality in visible light communication (VLC) networks. Using a hyperchaotic four-dimensional method, the bipolar real-valued OFDM signal can be used for constructing dynamic cypher keys modified at every frame over the communication time, resulting in a superior degree of protection against statistical and correlation attacks. In accordance with our findings, this approach decreases the ratio of peak-to-average power of the transmitted signal, and enhances the bit error rate efficiency and secrecy capacity of the OFDM-based VLC network, which improves confidentiality.