OAM-Based Concentric Spatial Division Multiplexing for Cellular IoT Terminals

Chen, Rui; Tian, Zengshan; Zhou, Hong; Long, Wen-Xuan

doi:10.1109/access.2020.2983222

Cited by 14 publications

(7 citation statements)

References 55 publications

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“…In recent researches [19,26,27], the Rician fading channel model has been used to characterize the OAM-based multipath wireless channel. Thus, we consider a Rician with K factor fading channel which obeys block fading within the V time slots.…”

Section: Channel Modelmentioning

confidence: 99%

Data BER analysis of OAM-assisted physical layer authentication system

Hu¹,

Zhang²,

Zhao³

et al. 2022

IEICE Electron. Express

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The bit error rate of data signal (data BER) of a key-based physical layer authentication (PLA) scheme suffers from a non-negligible performance loss, mainly caused by the authentication tags taking power from data symbols and interfering with the data demodulation. Considering the orthogonality among different orbital angular momentum (OAM) modes, in this paper, an OAM-assisted PLA (OAM-PLA) scheme is proposed to improve the performance of data BER. The data BER of the proposed OAM-PLA scheme over the Rician fading channel has better performance than the conventional PLA scheme..

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Section: Channel Modelmentioning

confidence: 99%

Data BER analysis of OAM-assisted physical layer authentication system

Hu¹,

Zhang²,

Zhao³

et al. 2022

IEICE Electron. Express

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“…Table I summarizes the results. The systems in [18] and [26] are considered in the comparison. As a benchmark, the theoretical limit of single-mode QPSK modulation is also included.…”

Section: Comparisons To Other Solutionsmentioning

confidence: 99%

Pre-Coding OAM Based MIMO System for Multi-User Communications

2022

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Recently, orthogonal Orbital Angular Momentum (OAM) modes of electromagnetic waves have been widely applied to achieve high spectral efficiency in the radio and microwave regimes. This study investigates utilizing multimodal OAM carrying waves in communications between a central unit and distributed receiving units. Accommodated by a planner grid-array of antenna elements and backed by appropriate pre-coding, the central unit can transmit to each receiving unit multi-OAM modes. A receiving unit comprises a simple circular array. Pre-coding at the transmitting unit is a two-fold process: preventing user-to-user interference and enforcing any predetermined combination of OAM modes to reach its destination. Accordingly, the parallel transmission of multiple channels to each receiver is possible. Channels aimed at the same receiver are distinguished by different modes, but the same group of modes can be simultaneously used upon transmission to other receivers. The numerical results show that significant increase in the transmission capacity is achieved. For instance, in a system including 6 receivers, 25 channels are delivered in parallel to each receiver while maintaining an acceptable low bit-error rate. Results are judged by considering the theoretical single-user quadrature phase shift keying modulation performance as a benchmark for comparison. This study also examines channel perturbations when interfering modes exist. In addition, it overcomes many typical limitations with the utilization of OAM-based solutions in radio, such as the need for transmitter-receiver alignment. The proposed system also solves the problem of wave divergence at high OAM modes, thereby avoiding the exclusion of using these modes in transmission.

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“…In addition, termination accuracy ε and are set to 0.001. Whereas, the upper and lower limits of EE are considered as λ max EE = 2 and λ min EE = 0 [15]. The transmitter with 4 UCAs is considered whereas the radius are 0.24 m, 0.36 m, 0.48 m and 0.6 m respectively [7].…”

Section: The Ee Maximization Algorithmmentioning

confidence: 99%

Energy Efficient Resource Allocation for UCA-Based OAM-MIMO System

Tang

Lin

Song

et al. 2021

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

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The combination of orbital angular momentum (OAM) and multi-input multi-output (MIMO) is identified as an effective solution to improve energy efficiency (EE) in the next-generation wireless communication. According to the orthogonality of OAM, we adopt uniform circular array (UCA) to establish the transmitter and receiver of the OAM-MIMO system in this paper. Our goal is to maximize the EE of the system whilst satisfying the maximum total transmit power and the minimum capacity requirement of each mode. Due to the inter-interference of different UCA at the same mode, the optimization problem involving the power allocation of modes is non-convex, thus is difficult to solve directly. To tackle this problem, the optimization problem is transformed into two sub-problems by using the fractional programming. Then we develop a dual-layer iteration algorithm where the nonconvex power allocation problem is transformed into a convex problem by exploiting the the first-order Taylor approximation in the inner layer, and the dichotomy is used to update EE in the outer layer. Simulation results comfirm the effectiveness of the proposed solution, and demonstrate the superiority of the OAM-MIMO system over the conventional MIMO system from the perspective of EE.

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OAM-Based Concentric Spatial Division Multiplexing for Cellular IoT Terminals

Cited by 14 publications

References 55 publications

Data BER analysis of OAM-assisted physical layer authentication system

Data BER analysis of OAM-assisted physical layer authentication system

Pre-Coding OAM Based MIMO System for Multi-User Communications

Energy Efficient Resource Allocation for UCA-Based OAM-MIMO System

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