1. A method implemented by a computer system of a vehicle that is a transmitter of a millimeter wave message which is transmitted to a receiver of the millimeter wave message, the method comprising:measuring, by a perception sensor, sensor data describing one or more locations of one or more objects that are proximate to the receiver and the transmitter;
determining, based on the sensor data, angle data describing one or more angles of arrival for the one or more objects and one or more angels of departure for the one or more objects;
generating, based on one or more of the sensor data and the angle data, propagation data describing (1) a list of paths between the transmitter and the receiver and (2) channel gains for each path included in the list of paths;
determining, based on one or more of the sensor data and the propagation data, a plurality of channels for successfully transmitting the millimeter wave message to the receiver; and
transmitting the millimeter wave message to the receiver simultaneously using the plurality of channels on a band of spectrum between 30 gigahertz and 300 gigahertz.