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The wide bandwidths offered at millimeter-wave (mmWave) frequencies have madethem an attractive choice for future wireless communication systems. Recentworks have presented beamforming strategies for enabling in-band full-duplex(FD) capability at mmWave even under the constraints of hybrid beamforming,extending the exciting possibilities of next-generation wireless. ExistingmmWave FD designs, however, do not consider frequency-selective mmWavechannels. Wideband communication at mmWave suggests that frequency-selectivitywill likely be of concern since communication channels will be on the order ofhundreds of megahertz or more. This has motivated the work of this paper, inwhich we present a frequency-selective beamforming design to enable practicalwideband mmWave FD applications. In our designs, we account for the challengesassociated with hybrid analog/digital beamforming such as phase shifterresolution, a desirably low number of radio frequency (RF) chains, and thefrequency-flat nature of analog beamformers. We use simulation to validate ourwork, which indicates that spectral efficiency gains can be achieved with ourdesign by enabling simultaneous transmission and reception in-band.

Frequency-Selective Beamforming Cancellation Design for Millimeter-Wave Full-Duplex