Signal Processing for 5G: Algorithms and Implementations

Chapter 13Orbital Angular Momentum-based Wireless Communications: Designs and Implementations

Alan. E. Willner, Yan Yan, Yongxiong Ren, Nisar Ahmed and Guodong Xie

1. 13.1 EM Waves Carrying OAM
2. 13.2 Application of OAM to RF Communications
3. 13.3 OAM Beam Generation, Multiplexing and Detection
   1. 13.3.1 OAM Beam Generation and Detection
   2. 13.3.2 Multiplexing and Demultiplexing of OAM Beams
4. 13.4 Wireless Communications Using OAM Multiplexing
   1. 13.4.1 Wireless Communications Using Gaussian and OAM Beams
   2. 13.4.2 32-Gbit/s mm-wave Communications using OAM and Polarization Multiplexing
   3. 13.4.3 16-Gbit/s mm-wave Communications by Combining Traditional Spatial Multiplexing and OAM Multiplexing with MIMO Processing
   4. 13.4.4 Multipath Effects of OAM Channels
   5. 13.4.5 OAM Communications based on Bessel Beams
5. 13.5 Summary and Perspective
6. References

One property of electromagnetic (EM) waves that has recently been explored is the ability to multiplex multiple beams carrying orbital angular momentum (OAM) such that each beam has a unique helical phase front. Such OAM-based multiplexing can potentially increase the system capacity and spectral efficiency of wireless communication links by transmitting multiple coaxial data streams. This chapter will introduce the basic concept of OAM and the principle of using OAM for spatial multiplexing in the wireless communications radio frequency (RF) range. In this chapter, we will briefly review the research and techniques related to OAM, including the generation, multiplexing ...