Feasibility study on full-duplex wireless millimeter-wave systems

To enable simultaneous transmit and receive operations on the same frequency band, also known as full duplex, on adjacent panels of a millimeter wave (mmWave) base station (BS), we benchmark the amount of leakage interference from the transmitter to the receiver. We construct a self-interference channel model consisting of line-of-sight (LOS) leakage and non-LOS (NLOS) reflections from nearby clusters. From simulations, we further show that due to antenna beamforming in mmWave systems, the LOS leakage interference is subdued, whereas the NLOS leakage is amplified. For some BS designs, the NLOS leakage is likely to be the dominant interference. It impacts system designs in two ways. First, the worst case interference can still saturate the receiver chain and would require analog and digital cancellation in addition to the isolation provided by antenna beamforming. Second, due to the delay associated with NLOS reflective components, the cancelers would need to accommodate a large dynamic delay.