Millimeter Wave Communications With OAM-SM Scheme for Future Mobile Networks

Abstract

The orbital angular momentum (OAM) technique provides a new degree of freedom for information transmissions in millimeter wave communications. Considering the spatial distribution characteristics of OAM beams, a new OAM spatial modulation (OAM-SM) millimeter wave communication system is first proposed for future mobile networks. Furthermore, the capacity, average bit error probability and energy efficiency of OAM-SM millimeter wave communication systems are analytically derived for performance analysis. Compared with the conventional multi-input multi-output (MIMO) millimeter wave communication systems, the maximum capacity and energy efficiency of OAM-SM millimeter wave communication systems are improved by 36% and 472.3%, respectively. Moreover, numerical results indicate that the proposed OAM-SM millimeter wave communication systems are more robust to path-loss attenuations than the conventional MIMO millimeter wave communication systems, which makes it suitable for long-range transmissions. Therefore, OAM-SM millimeter wave communication systems provide a great growth space for future mobile networks. Index TermsMillimeter wave communications, orbital angular momentum, spatial modulation, capacity, average bit error probability, energy efficiency.with respect to the transmission SNR is illustrated in Fig. 11. When the transmission SNR is less than 10 dB, the energy efficiency of OAM-SM millimeter wave communication systems increase with the increase of the transmission SNR. When the transmission SNR is larger than or equal to 10 dB, the energy efficiency of OAM-SM millimeter wave communication systems decrease with the increase of the transmission SNR. There exist a maximum energy efficiency of OAM-SM millimeter wave communication systems considering different transmission SNR values. When the transmission SNR is fixed, the energy efficiency of OAM-SM millimeter wave communication systems is always larger than the energy efficiency of MIMO millimeter wave communication systems. To be specific, compared with the energy efficiency of MIMO millimeter wave communication systems, the maximum energy efficiency of OAM-SM millimeter wave communication system is improved by 472.3%. VI. CONCLUSIONS Exploiting spatial distribution characteristics of OAM beams, a new OAM-SM millimeter wave communication system is first proposed for future mobile networks. Important performance metrics like capacity, ABEP and energy efficiency of OAM-SM millimeter wave communication systems are analytically obtained in closed forms. It is shown analytically that significant performance gains can be achieved by the OAM-SM millimeter wave communication systems over the conventional MIMO millimeter wave communication systems, e.g., the maximum capacity

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

“…Moreover, as described in Section III, radio OAM can be generated not only by employing antenna arrays, but also by using SPPs or spiral parabolic antennas or other single transmit antennas. Combining OAM with traditional MIMO technology can result in higher capacity gains [154], [155] or provide a more flexible system design [156], [157]. A 2 × 2 antenna aperture architecture, where each aperture multiplexes two OAM modes, is implemented in the 28 GHz band to achieve a 16 Gbit/s transmission rate.…”

Indoor Propagation of Electromagnetic Waves with Orbital Angular Momentum at 5.8 GHz

“…The high SNR in the narrow region can increase capacity of radio transmission system by using arrays of OAM antennas as in [15][16][17].…”

The New Purity and Capacity Models for the OAM-mmWave Communication Systems Under Atmospheric Turbulence

“…Because the OAM waves could decrease the spatial correlation of wireless channels, the capacity of OAM-based Multiple-Input Multiple-Output (MIMO) systems was shown to be larger than the capacity of the traditional MIMO systems in free space with weak multipath effect [21]. Moreover, the energy efficiency of OAM spatial modulation millimeter wave communication systems was shown to be higher than the energy efficiency of OAM-based MIMO systems [22], which made OAM spatial modulation millimeter wave communication systems more suitable for transmissions in long distances efficiently. In view of the fact that the divergence of OAM-based radio vortex waves is more significant than the divergence of radio plane waves, a new type of bifocal lens antenna was used for transmitting OAM-based signals to reduce the propagation attenuation [23].…”