Patent ID: 8494034

Claim:
A communication device comprising: a reception unit that receives a signal transmitted from another communication device via a transmission path; a transmission unit that transmits a signal to the another communication device via the transmission path; an error rate measurement unit that measures an error rate representing a probability of occurrence of errors in a signal received by the reception unit in a case where a bi-directional communication with the another communication device is performed; and a phase adjustment unit that adjusts a phase of a signal transmitted from the transmission unit to the another communication device based on an error rate measured by the error rate measurement unit, wherein the error rate measurement unit measures error rates in the signal received by the reception unit with respect to phases adjusted by the phase adjustment unit, and the phase adjustment unit selects a first phase that makes each of the error rates equal to or smaller than a given value among phases, and adjusts the phase of the signal transmitted from the unit to the another communication device to the first phase.