We present a microscopic quantum transport mechanism for microwave-induced resistance oscillations (MIROs) based on microwave-driven coherent states. By evaluating the impurity scattering matrix element between driven states, we show that the instantaneous scattering rate becomes dynamically synchronized with the velocity of the radiation-induced motion. The resulting velocity-dependent scattering provides a direct microscopic origin for the finite time-averaged transport response underlying MIROs. We further introduce a geometric dephasing mechanism arising from the accumulated displacement of the driven coherent state, which limits the oscillation amplitude at high microwave power. This mechanism naturally explains the observed crossover from linear to sublinear power dependence and predicts a magnetic-field-dependent saturation scale governed by the ratio between the driven displacement amplitude and the cyclotron radius. Our results establish a coherent-state picture of MIROs in which transport is controlled by synchronized scattering and geometric decoherence.

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• Landau levels
• Magnetotransport
• Quantum transport
• Two-dimensional electron system