Abstract
This study investigates the system capacity of dual-polarized orbital angular momentum (OAM) multiplexing that employs single-carrier with frequency domain equalization (FDE) in urban street canyon environments. To overcome the impact of multipaths, two types of FDE, designed with and without the consideration of the cross-polarization interference (XPI), are introduced. We derive the effects of the residual inter-mode interference (IMI), inter-symbol interference (ISI), and XPI when applying such FDE and incorporate their impacts into the system capacity analysis. Moreover, we adopt the urban street canyon model based on a ray-tracing simulation, which enables performance evaluation in a realistic multipath environment. The numerical results show that although the computational complexity is increased, the consideration of the XPI in the FDE weight design improves the system capacity, and its effectiveness is remarkable in the cases of short link distances.
Highlights
orbital angular momentum (OAM) multiplexing involves performance degradation owing to inter-mode interference (IMI) and inter-symbol interference (ISI) present in multipath environments such as reflections from the ground and buildings [13]–[15]
The numerical results of this study demonstrate the effects of polarization and frequency domain equalization (FDE) on the system capacity and computational complexity
We verify the effectiveness of dual-polarized OAM multiplexing employing single-carrier with frequency domain equalization (SC-FDE) in terms of both signal-to-interference-plus-noise ratio (SINR) and system capacity in urban street canyon environments based on a ray-tracing simulation
Summary
The diversification of mobile network services has led to an increase in the number of wireless devices and, the growth of mobile traffic. OAM multiplexing involves performance degradation owing to inter-mode interference (IMI) and inter-symbol interference (ISI) present in multipath environments such as reflections from the ground and buildings [13]–[15]. We successfully derived the system capacity of OAM multiplexing by employing SC-FDE and verified its robustness against the IMI and ISI in a multipath environment [19]. Type-1 FDE, which is a natural extension of single-polarized OAM multiplexing, suppresses the IMI and ISI independently in each polarization plane. Type-1 FDE, as shown, is a natural extension of single-polarized OAM multiplexing employing SC-FDE [11] In this FDE, the effect of XPI is ignored, and the IMI and ISI are suppressed independently in each polarization plane. The computational cost for generating weights is higher, type-2 FDE is considered to eliminate interference more effectively than type-1 FDE
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