Virtual MIMO Based Self-Interference Utilization for a Full-Duplex AF Relay OFDM System
- Resource Type
- Conference
- Authors
- Cao, Qingyu; Zhu, Xu; Jiang, Yufei
- Source
- 2022 IEEE 96th Vehicular Technology Conference (VTC2022-Fall) Vehicular Technology Conference (VTC2022-Fall), 2022 IEEE 96th. :1-6 Sep, 2022
- Subject
- Aerospace
Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Fields, Waves and Electromagnetics
Signal Processing and Analysis
Transportation
Vehicular and wireless technologies
Interference cancellation
OFDM
Simulation
Full-duplex system
Gain control
Relays
Full-duplex (FD)
relay
self-interference utilization
amplify-and-forward (AF)
MIMO
- Language
- ISSN
- 2577-2465
Time-dispersive loopback self-interference (SI) is a challenging issue for a full-duplex (FD) amplify-and-forward (AF) relay assisted orthogonal frequency division multiplexing (OFDM) system. In this paper, a utilization scheme is proposed for the uplink. A virtual multiple-input multiple-output (MIMO) system is modeled to enhance the receive diversity, by regarding the residual loopback SI after partial cancellation at relay as additional sources rather than noise. A gain control algorithm is proposed for the FD relay to enable the virtual MIMO modeling, and the optimal target transmission power at relay is derived to maximize the receive signal-to-interference-and-noise ratio (SINR) at base station. The proposed system is more practical as the main computational load is shifted from relay to BS to help the AF relay maintain a low running cost, compared to the previous relay-centric systems with complex SI cancellation at relay. The proposed system significantly outperforms the relay-centric system.