In-Band Full-Duplex Radios in 6G Networks
Implementation and Applications
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Sixth-generation (6G) wireless communication networks will transform connected things in 5G into connected intelligence. The networks can have human-like cognition capabilities by enabling many potential services, such as high-accuracy localization and tracking, augmented human sense, gesture and activity recognition, etc. For this purpose, many emerging applications in 6G have stringent requirements on transmission throughput and latency. With the explosion of devices in the connected intelligence world, spectrum utilization has to be enhanced to meet these stringent requirements. In-band ful...
Sixth-generation (6G) wireless communication networks will transform connected things in 5G into connected intelligence. The networks can have human-like cognition capabilities by enabling many potential services, such as high-accuracy localization and tracking, augmented human sense, gesture and activity recognition, etc. For this purpose, many emerging applications in 6G have stringent requirements on transmission throughput and latency. With the explosion of devices in the connected intelligence world, spectrum utilization has to be enhanced to meet these stringent requirements. In-band full-duplex has been reported as a promising technique to enhance spectral efficiency and reduce end-to-end latency. However, simultaneous transmission and reception over the same frequency introduce additional interference compared to conventional half-duplex radios. The receiver is exposed to the transmitter of the same node operating in in-band full-duplex mode, causing self-interference. Due to the significant power difference between self-interference and the signal of interest, self-interference must be effectively suppressed to benefit from in-band full-duplex operation. In addition to self-interference, uplink users will interfere with downlink users within the range, known as co-channel interference. This interference could be significant in cellular networks, so it has to be appropriately processed to maximize the in-band full-duplex gain. The objective of this monograph is to present a timely overview of self-interference cancellation techniques and discuss the challenges and possible solutions to implement effective self-interference cancellation in 6G networks. Also included is beamforming to manage the complex interference and maximize the in-band full-duplex gain in cellular networks. Furthermore, a deep insight into the benefits of in-band full-duplex operations on various emerging applications is presented, such as integrated access and backhaul networks, integrated sensing and communications, and physical layer security.
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