Various embodiments provide techniques for high frequency wireless communication. For example, embodiments include techniques for a transmission scheme for physical downlink control channel (PDCCH) with single carrier waveform; synchronization signal block (SSB) rate matching indication for NR unlicensed operation; beam acquisition for frequency division duplex (FDD) systems; and/or SSB patterns and multiplexing for downlink transmissions. Other embodiments may be described and claimed.