Capacity Modelling and Performance Analysis of OAM-OFDM Wireless Communication Systems

Abstract

The Orbital Angular Momentum (OAM) wireless communication technology has received much attention in recent years for its natural orthogonality between different OAM states. Combining the OAM technology with the Orthogonal Frequency Division Multiplexing (OFDM) technology, we proposed a new OAM-OFDM wireless communication system to explore a new approach for enhancing the transmission capacity of the wireless communication system. Atmospheric turbulence is an important factor for influencing the capacity of the OAM-OFDM wireless communication system. In consideration of the effect of the atmospheric turbulence, we derived a crosstalk model of the proposed OAM-OFDM wireless communication system. Furthermore, a capacity model of the OAM-OFDM wireless communication system is proposed in consideration of the effect of atmospheric turbulence on both the OAM and OFDM signals. Compared with the conventional OAM wireless communication system, the capacity performance of the proposed OAM-OFDM wireless communication system is significantly improved and the average improvement is 751%. INDEX TERMS Orbital angular momentum, capacity, bit error ratio, orthogonal frequency division multiplexing.

How to Game-theoretically Disentangle & Control the Efficiency of Orbital Angular Momentum

“…The signal-to-interference-noise-ratio (SINR) of decoding the mode ℓ of the OAM set in RIS based transceivers are given as [1]- [4]…”

“…Step 7. Now, the irradiance is as [1]- [12] the absolute-value of the sume of the OAM beams − Laguerre Gaussian ones etc. Now, let us go in another zone by a transformation ap- plication.…”

“…The irradiance is now tractable with regard to the term 𝜕Ω. Consequently, the irradiance and its PDF help us in reaching out the signal-to-noise-ratio (SNR) and BER [1]- [6] − something that is followed in the step below.…”

“…I N 1992 and by Allen et al, the idea of optical vortex was combined to the issue of the orbital angular momentum (OAM) [1]- [12]. The OAM technique implemented according Manuscript received XX, 20YY; revised X XX, XXXX.…”

Modelling and Optimization of OAM-MIMO Communication Systems with Unaligned Antennas

“…The OAM technique can provide a new degree of freedom for wireless communication systems, thereby increasing the system capacity of wireless communication systems [2]. However, the orthogonality of OAM states is interfered by the atmospheric turbulence when the OAM technique is adopted in wireless communication systems [3], [4]. When the multiple-input multiple-output (MIMO) technology is used for OAM wireless communication systems, the misalignment between the transmitting and receiving antennas can cause the interference among different OAM states [5].…”