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This book presents the modeling and transmission theory of RF OAM
communications. The book features the UCA-based RF point-to-point
OAM communication system, the UCA-based RF point-to-multipoint OAM
wireless backhaul network, the HCCL structure for long-distance OAM
transmissions, and the UCA-based joint OAM RadCom scheme. For the
UCA-based RF point-to-point OAM communication system, a 2-D
ESPRIT-based distance and AoA estimation method is first
introduced, followed by an OAM reception scheme including the
hybrid mechanical and electronic beam steering with the estimated
AoA and the amplitude detection with the estimated distance. The
proposed RF OAM communication scheme is extended to the RF OAM-MIMO
system equipped with UCCAs. For the UCA-based RF
point-to-multipoint OAM wireless backhaul network, an OAM-based
multi-user distance and AoA estimation method is introduced,
followed by a multi-user OAM preprocessing scheme. At last, the
proposed methods are extended to the downlink multi-user OAM-MIMO
wireless backhaul system equipped with UCCAs. Moreover, a novel
HCCL structure is introduced to realize long-distance OAM
transmission. For the UCA-based joint OAM RadCom scheme, an
OAM-based 3-D super-resolution position estimation and rotation
velocity detection method is introduced, and then the PCRB of the
OAM-based estimates and the transmission rate of the integrated
system are derived and analyzed. To achieve the best performance
trade-off, the transmitted integrated OAM beams is optimized by
means of an exhaustive search method. Finally, this book discusses
future research directions to inspire further investigation in the
field of RF OAM communications from different perspectives.
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R398
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