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%.
Highlights
With the upcoming commercialization of the 5th generation (5G) mobile communication system, more and more wearable devices and other wireless devices will be put into use in the future, which is followed by the challenges of the system capacity and spectrum resource
We propose a new Orbital Angular Momentum (OAM)-Orthogonal Frequency Division Multiplexing (OFDM) system, where the effect of atmospheric turbulence on both the OAM and OFDM signals are taken into consideration for analyzing the capacity performance of OAM-OFDM wireless communication systems
When the refractive index structure constant is fixed, the bit error ratio (BER) increases with the increase of the absolute value of the OAM state for the reason that the OAM signals with higher absolute value of the OAM state are more vulnerable in the atmospheric turbulence
Summary
With the upcoming commercialization of the 5th generation (5G) mobile communication system, more and more wearable devices and other wireless devices will be put into use in the future, which is followed by the challenges of the system capacity and spectrum resource. The transmission performance of time division multiplexed (TDM) and OFDM signals over optical frequency bands with atmospheric turbulence effects were compared and indicated that the SNR of OFDM systems had 14.7 dB gain in [3]. We propose a new OAM-OFDM system, where the effect of atmospheric turbulence on both the OAM and OFDM signals are taken into consideration for analyzing the capacity performance of OAM-OFDM wireless communication systems. A capacity model of the OAM-OFDM transmission system is proposed for wireless communication in atmospheric turbulence.
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