Abstract
In-band full duplex (IBFD) is regarded as one of the most significant technologies for addressing the issue of spectrum scarcity in 5G and beyond systems. In the realization of practical IBFD systems, self-interference, i.e., the interference that the transmitter causes to the collocated receiver, poses a major challenge to antenna designers; it is a prerequisite for applying other self-interference cancellation (SIC) techniques in the analog and digital domains. In this paper, a comprehensive survey on SIC techniques in the antenna/propagation (AP) domain is provided and the pros and cons of each technique are studied. Opportunities and challenges of employing IBFD antennas in future wireless communications networks are discussed.
Highlights
As the demands for connectivity and data rates increase exponentially, there has been a shortage of frequency resources to support new systems, and this spectrum sparsity problem is becoming significantly more severe for 6G
A fundamental challenge to In-band full-duplex (IBFD) systems is self-interference (SI), which is the signal received by a receiver from a collocated transmitter [3]
IBFD can be combined with multiple-input and multiple-output (MIMO) to further enhance capacity of a radio link [98]
Summary
As the demands for connectivity and data rates increase exponentially, there has been a shortage of frequency resources to support new systems, and this spectrum sparsity problem is becoming significantly more severe for 6G. Active SIC techniques are usually applied in the digital and analog domains to exploit antennas. Active SIC techniques are usually applied in the digital and analog domains to the knowledge of its own transmit signal to cancel the self-interference, i.e., to generate a exploit the knowledge of its own transmit signal to cancel the self‐interference, i.e., to gen‐. Analog domain cancellation is capable ofwhich preventing high‐power inflicted inflicted the analog-to-digital converter (ADC), wouldthe desensitize theSI automatic by the analog‐to‐digital converter (ADC), which would automatic gain gain control (AGC) owing to signal leakages [12] This suppression may occur either before or before or after the downconverter and the low-noise amplifier (LNA). Passive SIC is summarized as techniques embedded on antennas or networks to electromagnetically isolate the TX and RX antennas.
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