Hybrid Frequency and Phase-Shift Keying Modulation for Energy Efficient Optical Wireless Systems

Azim, Ali Waqar; Guennec, Yannis Le; Ros, Laurent

doi:10.1109/lwc.2019.2954832

Cited by 12 publications

(13 citation statements)

References 9 publications

(14 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results indicate that we can target a range of applications involving different spectral and/or energy efficiencies. Furthermore, κ = 1 for DCEO-OFDM-IM corresponds to DC-FPSK we proposed in [19] for energy-efficient IoT communications.…”

Section: Bit Error Rate Analysismentioning

confidence: 99%

“…The number of bits, λ transmitted per EO-OFDM-DM symbol of duration T s is given by (35), which results in a data rate of R = λ/T s . Moreover, the base-band bandwidth needed by EO-OFDM-DM is same as that of EO-OFDM-IM, which is given by (19). Thus, the SE η = R/B for EO-OFDM-DM in bits/s/Hz is…”

Section: Performance Analysis Of Eo-ofdm-dmmentioning

confidence: 99%

“…Furthermore, unlike O-OFDM, the EO-OFDM-IM provides an advantageous EE/SE trade-off. It may also be noticed that κ = 1 for DCEO-OFDM-IM with 2-PAM corresponds to DC-frequency and (binary) phase shift keying (DC-FPSK) approach that we developed in [19].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced Optical-OFDM With Index and Dual-Mode Modulation for Optical Wireless Systems

et al. 2020

Self Cite

View full text Add to dashboard Cite

In this article, we introduce intensity modulation and direct detection compatible enhanced optical-orthogonal frequency division multiplexing with index modulation (EO-OFDM-IM) schemes. These approaches augment the spectral efficiency (SE) relative to classical counterparts by enlarging the index domain information using the so-called virtual sub-carriers. The classical O-OFDM-IM schemes do not necessarily enhance the SE because of low cardinality of IM complex-valued sub-carrier set which is limited by constraints like Hermitian symmetry. The index domain extension for EO-OFDM-IM schemes is achieved by replacing the complex-valued sub-carriers (as in O-OFDM-IM) by twice real-valued virtual sub-carriers. The realization of non-negative signals is based on precepts of classical O-OFDM approaches, that are direct current (DC) O-OFDM and asymmetrically clipped (AC) O-OFDM. Thus, we refer to the EO-OFDM-IM approaches as DCEO-OFDM-IM and ACEO-OFDM-IM. We shall establish that in addition to improving SE, EO-OFDM-IM schemes provide extended granularity effectuating better SE/energy efficiency (EE) trade-off and improved bit error rate performance over classical counterparts. The EO-OFDM-IM schemes, however, are suitable for lower alphabet cardinalities of pulse-amplitude modulation making it difficult to attain high spectral efficiencies while maintaining EE. To circumvent this limitation, dual-mode (DM) counterparts, DCEO-OFDM-DM and ACEO-OFDM-DM are proposed. The numerical simulations shall demonstrate that the EO-OFDM-DM approaches are more energy and spectral efficient than classical O-OFDM-DM schemes and provide an advantageous granularity for EE/SE trade-off. Additionally, we use efficient index mapping and de-mapping algorithms based on Pascal's triangle, which allows investigating these approaches for peak SE by precluding the so-called sub-block partitioning. For peak SE, the use of optimal maximum-likelihood (ML) detector is cumbersome, therefore, we introduce two sub-optimal low-complexity detectors based on energy detection and ML criterion. INDEX TERMS Optical-orthogonal frequency-division multiplexing, index modulation, intensity modulation and direct detection, optical wireless systems.

show abstract

Section: Bit Error Rate Analysismentioning

confidence: 99%

Section: Performance Analysis Of Eo-ofdm-dmmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Optical-OFDM With Index and Dual-Mode Modulation for Optical Wireless Systems

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Frequency and phase-shift synthesis modulation technology (FPSSM) is widely used in aviation, wireless communication, and other fields. Azim et al [9] utilize FPSSM technology for energy-efficient optical wireless systems with direct current (DC) offset hybrid frequency and phase shift keying (DC-FPSK) modulation for Internet-of-Things based on optical wireless systems resulting in higher modulation rates and greater flexibility. An FPSSM signal optical generation technique is proposed in [10], which uses a polarization-preserving fiber Bragg grating with different responses to different input polarization states to convert the baseband information loaded into the signal polarization state to that of the output wavelength, and achieves frequency modulation by interpolation of the beat frequency at the receiver side.…”

Section: Introductionmentioning

confidence: 99%

Research on Phase-Shifted Full-Bridge Circuit Based on Frequency and Phase-Shift Synthesis Modulation Strategy

Jiang¹,

Che²,

Li³

et al. 2022

Energy Engineering

View full text Add to dashboard Cite

The full-bridge converters usually use transformer leakage inductance and parallel resonant capacitors to achieve smooth current commutation and soft switching functions, which can easily cause problems such as energy leakage and significant duty cycle loss. This paper designs a novel full-bridge zero-current (FB-ZCS) converter with series resonant capacitors and proposes a frequency and phase-shift synthesis modulation (FPSSM) control strategy based on this topology. Compared with the traditional parallel resonant capacitor circuit, the passive components used are significantly reduced, the structure is simple, and there is only a slight energy loss. By controlling the charging time of the capacitor, it can be achieved without additional switches or auxiliary circuits. The automatic control of capacitor energy based on input current addresses the low efficiency of the traditional control strategies. This paper introduces its principle in detail and verifies it through simulation. Finally, an experimental prototype was built further to demonstrate the feasibility of the theory through experiments. The module can be applied to a photovoltaic DC collection system using input parallel output series (IPOS) cascade to provide a new topology for large-scale, long-distance DC transmission.

show abstract

“…Though U-FSK is spectrally less efficient than DC-FSK, it yields higher energy efficiency. We refer interested readers to [2], [3], [4] for a detailed description of various FSK schemes and their generalizations for VLC. In this work, we shall restrain our discussion to only U-FSK.…”

Section: Introductionmentioning

confidence: 99%

Near-Optimal Low-Complexity Harmonic Receiver for Unipolar-FSK

Azim

Khan

Wulf

et al. 2021

IEEE Wireless Commun. Lett.

Self Cite

View full text Add to dashboard Cite

In this letter, we propose a near-optimal lowcomplexity frequency-domain (FD) harmonic receiver for visible light communication based unipolar frequency-shift keying (U-FSK). The time-domain (TD) maximum-likelihood (ML) receiver for U-FSK is computationally complex, while the sub-optimal receiver increases the noise variance. The proposed harmonic receiver determines the transmitted frequency from the crosscorrelations between the FD received waveform and the FD dictionary waveforms reduced to their strongest harmonics. The results shall demonstrate that besides affording a linerarithmic complexity, the performance of the harmonic receiver closely approaches that of TD ML receiver which exhibits quadratic complexity.

show abstract

Hybrid Frequency and Phase-Shift Keying Modulation for Energy Efficient Optical Wireless Systems

Cited by 12 publications

References 9 publications

Enhanced Optical-OFDM With Index and Dual-Mode Modulation for Optical Wireless Systems

Enhanced Optical-OFDM With Index and Dual-Mode Modulation for Optical Wireless Systems

Research on Phase-Shifted Full-Bridge Circuit Based on Frequency and Phase-Shift Synthesis Modulation Strategy

Near-Optimal Low-Complexity Harmonic Receiver for Unipolar-FSK

Contact Info

Product

Resources

About