A 2-D FFT-Based Transceiver Architecture for OAM-OFDM Systems With UCA Antennas

Chen, Rui; Yang, Wenhai; Xu, Hui; Li, Jiandong

doi:10.1109/tvt.2018.2817230

Cited by 61 publications

(49 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…OAM beam divergence and misalignment [159] Multipath effects [161], [162] OAM-OFDM transceiver [163] OAM-DM [94], [95] High data rate communications Digital signal processing (DSP) algorithm Beam steering [160] PDM [88], [145] OAM-SK [144] transmits the information in free space by multiplexing four OAM modes employing a phase hologram loaded on a SLM. Subsequently, this method is used to implement the encoding of two-dimensional images [73], [100].…”

Section: Challenges and Solutionsmentioning

confidence: 99%

“…Another potential solution is to use orthogonal frequency-division multiplexing (OFDM) technology in radio OAM systems. Recently, a transceiver architecture for broadband OAM-OFDM wireless communication systems has been proposed in [163]. The transmitter uses a baseband digital two-dimensional Fast Fourier Transform (2-D FFT) algorithm and a UCAA to generate OAM-OFDM signals.…”

Section: Radio Oam Communicationsmentioning

confidence: 99%

See 1 more Smart Citation

Orbital Angular Momentum Waves: Generation, Detection, and Emerging Applications

Chen

Zhou

Moretti

et al. 2020

IEEE Commun. Surv. Tutorials

Self Cite

249

View full text Add to dashboard Cite

Orbital angular momentum (OAM) has aroused a widespread interest in many fields, especially in telecommunications due to its potential for unleashing new capacity in the severely congested spectrum of commercial communication systems. Beams carrying OAM have a helical phase front and a field strength with a singularity along the axial center, which can be used for information transmission, imaging and particle manipulation. The number of orthogonal OAM modes in a single beam is theoretically infinite and each mode is an element of a complete orthogonal basis that can be employed for multiplexing different signals, thus greatly improving the spectrum efficiency. In this paper, we comprehensively summarize and compare the methods for generation and detection of optical OAM, radio OAM and acoustic OAM. Then, we represent the applications and technical challenges of OAM in communications, including free-space optical communications, optical fiber communications, radio communications and acoustic communications. To complete our survey, we also discuss the state of art of particle manipulation and target imaging with OAM beams.

show abstract

Section: Challenges and Solutionsmentioning

confidence: 99%

Section: Radio Oam Communicationsmentioning

confidence: 99%

Orbital Angular Momentum Waves: Generation, Detection, and Emerging Applications

Chen

Zhou

Moretti

et al. 2020

IEEE Commun. Surv. Tutorials

Self Cite

249

View full text Add to dashboard Cite

show abstract

“…For higher data rate transmission, OFDM is often applied and naturally the OAM-OFDM communication system has been proposed in [7]. In an LoS MCMM-OAM communication system, we assume P subcarriers and U OAM modes for data transmission, and P subcarriers and U OAM modes for training, 1…”

Section: B Signal Modelmentioning

confidence: 99%

Multi-Mode OAM Radio Waves: Generation, Angle of Arrival Estimation and Reception With UCAs

Chen

Long

Wang

et al. 2020

IEEE Trans. Wireless Commun.

Self Cite

118

View full text Add to dashboard Cite

Orbital angular momentum (OAM) at radio frequency (RF) provides a novel approach of multiplexing a set of orthogonal modes on the same frequency channel to achieve high spectrum efficiencies. However, there are still big challenges in the multi-mode OAM generation, OAM antenna alignment and OAM signal reception. To solve these problems, we propose an overall scheme of the line-of-sight multi-carrier and multi-mode OAM (LoS MCMM-OAM) communication based on uniform circular arrays (UCAs). First, we verify that UCA can generate multi-mode OAM radio beam with both the RF analog synthesis method and the baseband digital synthesis method. Then, for the considered UCA-based LoS MCMM-OAM communication system, a distance and AoA estimation method is proposed based on the two-dimensional ESPRIT (2-D ESPRIT) algorithm. A salient feature of the proposed LoS MCMM-OAM and LoS MCMM-OAM-MIMO systems is that the channel matrices are completely characterized by three parameters, namely, the azimuth angle, the elevation angle and the distance, independent of the numbers of subcarriers and antennas, which significantly reduces the burden by avoiding estimating large channel matrices, as traditional MIMO-OFDM systems. After that, we propose an OAM reception scheme including the beam steering with the estimated AoA and the amplitude detection with the estimated distance. At last, the proposed methods are extended to the LoS MCMM-OAM-MIMO system equipped with uniform concentric circular arrays (UCCAs). Both mathematical analysis and simulation results validate that the proposed OAM reception scheme can eliminate the effect of the misalignment error of a practical OAM channel and approaches the performance of an ideally aligned OAM channel. Index Terms-Orbital angular momentum (OAM), uniform circular array (UCA), angle of arrival (AoA) estimation, OAM detection, multiple-input multiple-output (MIMO).

show abstract

“…Adressed Problem(s) Key Features and Solutions [325] Beam divergence • Generated a 60 GHz radio communication link that simultaneously supports two separated channels • A parabolic reflector is used to minimize divergence and to focus the coaxially propagating OAM radio beams [326] Beam divergence • Generated a converging and non-diffracting Bessel-like OAM beams based on phase-engineered metalenses for microwave applications • Introduced the possibility to control the OAM beam radius differently from all the previously demonstrated OAM generation techniques [327] Beam purity, divergence • Proposed an effective technique to generate multiple OAM beams via an antenna array fed by a two-layer Rotman lens • Low cost and easy to implement and integrate with available technologies [328] OAM detection • Designed a reception technique for OAM millimeter waves consisting of receiving a part of the signal in the time domain rather than receiving the complete signal in the space domain • Rotated the OAM waves without altering the polarization of the beams at the transmitter and used a single fixed antenna at the reception [329] OAM detection • Used the Doppler shift induced when rotating OAM modes to detect the waves at the reception • Digitally rotated the receiving antenna using DSP methods instead of mechanical rotation [330] OAM detection • Proposed a single metasurface for the detection of multiples OAM modes • Modified the transmittance function of the metasurface to maximize the directivity [331] Bandwidth, chromatic aberration • Efficiently converted circularly polarized waves to OAM carrying waves over a broad bandwidth using a multi-layer achromatic metasurface [332] Multipath • Proposed a 2D-FFT based transceiver architecture • Low complexity algorithm for OAM-OFDM implementation [333] Gain and phase mismatches • Proposed a calibration process based on mathematical derivations to estimate, and compensate the gain and phase mismatches between the UCA-based transmitter and receiver simultaneously.…”

Section: Referencementioning

confidence: 99%

Communicating Using Spatial Mode Multiplexing: Potentials, Challenges, and Perspectives

Trichili

Park

Zghal

et al. 2019

IEEE Commun. Surv. Tutorials

182

View full text Add to dashboard Cite

Time, polarization, and wavelength multiplexing schemes have been used to satisfy the growing need of transmission capacity. Using space as a new dimension for communication systems has been recently suggested as a versatile technique to address future bandwidth issues. We review the potentials of harnessing the space as an additional degree of freedom for communication applications including free space optics, optical fiber installation, underwater wireless optical links, on-chip interconnects, data center indoor connections, radio frequency and acoustic communications. We focus on the orbital angular momentum (OAM) modes and equally identify the challenges related to each of the applications of spatial modes and the particular OAM modes in communication. We further discuss the perspectives of this emerging technology. Finally, we provide the open research directions and we discuss the practical deployment of OAM communication links for different applications. ). 4 in the future. We also summarize the open problems and the future research directions. A discussion of the practicability and cost of multi-OAM communication is also included. II. OAM POTENTIALS A. Free Space Optical CommunicationFSO is a license free wireless communication configuration that has recently received much interest for a variety of applications. FSO is an attractive solution for last mile connectivity problems, particularly for communication networks, when the installation of fiber optics is costly or not possible [66]. FSO can be also used to establish inter-building secure communication, and can be deployed as a backup to optical fibers. Wireless optical communication can guarantee a line-of-sight (LoS) high bit rate wireless transmission over long distances, up to several kilometers. Furthermore, FSO communication is considered as a promising technique to scale down bandwidth challenges in future 5G networks [67].Multiple wavelength FSO provides better transmission, as demonstrated in [68], [69]. Data can be mapped on advanced modulation formats to achieve high bit rates and high spectral efficiency levels [70]- [72]. Another option is multiple-input and multiple-output (MIMO) FSO communication in which multiple lasers are positioned to transmit Gaussian beams to multiple receiving apertures [73]. Over the last few years, it has been proven that it is possible to transmit information over spatially structured light beams [21], [74], [75] including OAM beams and plane waves. Our focus is on the OAM modes of light.The first PoC communication experiment incorporating OAMs in free space was carried out in 2004 by Gibson and co-workers [21]. Over a 15-meter long link, 8 -spaced values were chosen along the Gaussian beam as an alphabet for the communication. OAM beams were generated and detected using two light modulators. Since then, much progress has been made and free space transmission capacity of over 1 Tbit/s is, today, possible [76]- [78]. By performing three dimensional multiplexing, Huang and co-workers were able to attain a 100 Tbi...

show abstract

A 2-D FFT-Based Transceiver Architecture for OAM-OFDM Systems With UCA Antennas

Cited by 61 publications

References 14 publications

Orbital Angular Momentum Waves: Generation, Detection, and Emerging Applications

Orbital Angular Momentum Waves: Generation, Detection, and Emerging Applications

Multi-Mode OAM Radio Waves: Generation, Angle of Arrival Estimation and Reception With UCAs

Communicating Using Spatial Mode Multiplexing: Potentials, Challenges, and Perspectives

Contact Info

Product

Resources

About