Full-Duplex Wireless Communication Systems

Full-duplex wireless communication systems permit simultaneous transmission and reception over the same frequency band, offering the potential to double spectral efficiency and reduce end-to-end latency compared with traditional half-duplex designs. Central to their operation is the suppression of self-interference, the powerful leakage of a transmitter’s own signal into its receiver chain. Advances in analogue and digital self-interference cancellation, aided by adaptive filtering and non-linear signal models, have progressively driven suppression levels into the order of 100 dB. Full-duplex architectures now exploit multiple-input multiple-output (MIMO) arrays and beamforming to spatially isolate transmit and receive paths, as well as hybrid approaches combining time- and frequency-division protocols to mitigate residual interference. Emerging research explores integration of full-duplex nodes into next-generation mobile networks, enabling simultaneous access and backhaul, enhanced wireless sensing, and dynamic control of the propagation environment through reconfigurable intelligent surfaces. Real-world demonstrations on software-defined radio platforms and field experiments in diverse settings―from millimetre-wave bands to underwater acoustic channels―have validated theoretical gains and revealed practical challenges in hardware non-idealities, channel variability and network-level coexistence. As deployment scales, cross-link interference in dense multi-cell scenarios and interoperability with legacy half-duplex systems will require novel coordination and medium-access control strategies. Nevertheless, the full-duplex paradigm promises transformative improvements for 6G wireless, ad-hoc networks, the Internet of Things and beyond.

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Full-Duplex Wireless Communication Systems publication trend

The graph below shows the total number of articles in full-duplex wireless communication systems across all publications each year (not limited to Nature Index journals).

Technical terms

Full-duplex: Operation in which a transceiver simultaneously transmits and receives on the same frequency channel.

Self-interference: The undesired coupling of a device’s transmit signal into its own receive path, often orders of magnitude stronger than the intended remote signal.

Self-interference cancellation (SIC): Techniques, both analogue and digital, used to suppress or subtract self-interference to a level below the receiver noise floor.

MIMO (Multiple-Input Multiple-Output): An antenna architecture that employs multiple transmit and receive elements to increase capacity through spatial multiplexing or diversity.

Beamforming: The spatial filtering of wireless signals through coordinated phase and amplitude weighting of antenna arrays to enhance desired paths and reject interference.

References

1. Full-Duplex Wireless for 6G: Progress Brings New Opportunities and Challenges. IEEE Journal on Selected Areas in Communications (2023).
2. Digital Self-Interference Cancellation for Asynchronous In-Band Full-Duplex Underwater Acoustic Communication. Sensors (2018).
3. Full-Duplexing With SDR Devices: Algorithms, FPGA Implementation, and Real-Time Results. IEEE Transactions on Wireless Communications (2020).
4. Theoretical Analysis of In-Band Full-Duplex Radios With Parallel Hammerstein Self-Interference Cancellers. IEEE Transactions on Wireless Communications (2021).
5. CFFD-MAC: A Hybrid MAC for Collision Free Full-Duplex Communication in Wireless Ad-Hoc Networks. IEEE Access (2021).