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Duplex antenna system for MIMO application
Published in Yadwinder Kumar, Shrivishal Tripathi, Balwinder Raj, Multifunctional MIMO Antennas, 2022
D. Venkata Siva Prasad, Harsh Verdhan Singh, Punya P. Paltani, Shrivishal Tripathi
In IBFD wireless communication systems, the radios transmit and receive the signals on the same frequency band simultaneously, and good duplexing performance is due to recent improvements in self-interference cancelation techniques. The spectrum efficiency is doubled by the duplexing operation of the IBFD system at the physical layer of the wireless network. Such a system also solves some important problems such as large end-to-end delays, hidden terminals, and loss of throughput due to congestion in existing wireless networks. Self-interference cancellation techniques can be implemented in the following three domains: (1) The propagation domain deals at the antenna level, where self-interference is canceled by implementing proper antenna design and by using polarization and pattern-diversity methods. (2) The analog-circuit domain is where self-interference is canceled using analog circuits such as attenuators and phase shifters between two ports. (3) The digital domain is where self-interference is canceled using digital signal processing methods [43]. Self-interference cancellation technologies are broadly divided into two categories: one is passive suppression, where the transmitter and receiver antennas are isolated electromagnetically, and the other is active cancellation, in which the self-interference is mitigated by using a node’s knowledge of its own transmitted signal [44]. Generally, propagation-domain suppression can be achieved in different ways—e.g., directional antennas, transmit-beamforming, antenna orientation, path loss, and duplexers.
5G Networks
Published in Mahbub Hassan, Wireless and Mobile Networking, 2022
With advancements in DSP and processing powers, it is now contemplated to implement self-interference cancellation to realize full-duplex over the same frequency, so that simultaneous transmission and reception may be possible [FDUPLEX 2011]. Figure 3 illustrates how self-interference can be conceptually cancelled through additional signal processing and circuits implemented within the wireless radio. Basically, an attenuated and delayed transmit signal should be combined with the received signal to cancel the interference within the received signal that was caused by the over-the-air interference from the transmitting antenna. Such full-duplex communication would double the throughput, reduce end-to-end latency, and allow transmitters to monitor (estimate) the channel.
A vision of 6G – 5G's successor
Published in Journal of Management Analytics, 2020
The contradiction between the explosive growth of wireless communication services and the shortage of spectrum resources has become increasingly prominent. The goals of the development and evolution of mobile communications are to improve spectrum efficiency and to eliminate the differences in the use and management of spectrum resources under traditional TDD/FDD modes. Full-duplex technology uses self-interference cancellation technology to achieve flexible spectrum resource utilization between the transceiver link, in order to achieve the purpose of improving throughput and reducing transmission delay (Giordani et al., 2020; Stoica & de Abreu, 2019).