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Modern mmWave systems have limited scalability due to inflexibility inperforming frequency multiplexing. All the frequency components in the signalare beamformed to one direction via pencil beams and cannot be streamed toother user directions. We present a new flexible mmWave system calledmmFlexible that enables flexible directional frequency multiplexing, wheredifferent frequency components of the mmWave signal are beamformed in multiplearbitrary directions with the same pencil beam. Our system makes two keycontributions: (1) We propose a novel mmWave front-end architecture called adelay-phased array that uses a variable delay and variable phase element tocreate the desired frequency-direction response. (2) We propose a novelalgorithm called FSDA (Frequency-space to delay-antenna) to estimate delay andphase values for the real-time operation of the delay-phased array. Throughevaluations with mmWave channel traces, we show that mmFlexible provides a60-150% reduction in worst-case latency compared to baselines

mmFlexible: Flexible Directional Frequency Multiplexing for Multi-user mmWave Networks