1. A method for collision detection by a transmission device (TD), the method comprising:identifying, by the TD, one or more time periods of a signal generated by the TD, the one or more time periods corresponding to periods during which the TD will not transmit energy on a shared channel; and
transmitting, by the TD, a subset of the signal, wherein while a current time is within one of the one or more time periods, transmitting the subset of the signal comprises:
turning off, by the TD, a transmitter of the TD at a beginning of the time period,
detecting, by the TD, energy received on the shared channel during a portion of the time period,
turning on, by the TD, the transmitter of the TD before an end of the time period, and
determining, by the TD, that the detected energy meets a collision threshold, and based thereon, determining that there is a transmission collision.