A correlation-based rate adaptation scheme is enabled for practical communication devices that provides for communication data rate adaptation in a complex andor rapidly changing communication environment. In one embodiment, the circuit includes a signal generator for generating a square wave signal that varies in magnitude between a first voltage and a second voltage, and a voltage regulation circuit. A measuring unit measures an amount of rotation of the image carrier when the image carrier is intermittently driven. 11 standard, where the two systems share a common wireless transmission medium.