  Virtual full-duplex (VFD) is a powerful solution to compensate the rate loss
of half-duplex relaying without the need to full-duplex capable nodes.
Inter-relay interference (IRI) challenges the operation of VFD relaying
systems. Recently, improper signaling is employed at both relays of the VFD to
mitigate the IRI by imposing the same signal characteristics for both relays.
To further boost the achievable rate performance, asymmetric time sharing VFD
relaying system is adopted with different improper signals at the half-duplex
relays. The joint tuning of the three design parameters improves the achievable
rate performance at different ranges of IRI and different relays locations.
Extensive simulation results are presented and analyzed to show the achievable
rate gain of the proposed system and understand the system behavior.
