Patent ID: 8917758

Claim:
A communication device comprising: a reception unit that receives a signal treated with a setting of a modulation scheme based on a modulation scheme designation information and a controlling of a transmission power based on the transmission power designation information by an external transmitter, demodulating said received signal based on a modulation scheme control information, and outputting a received data; a reception level measurement unit that measures a signal level of said signal and outputting the reception level; a reception modulation scheme extraction unit that outputs said modulation scheme control information based on said received data; a designation information output unit that includes a target reception level setting unit to which the modulation scheme changeover threshold value and the target reception level are set to be correlated with said modulation scheme for outputting said modulation scheme designation information based on a comparison result of said reception level and said modulation scheme changeover threshold value, and outputting said transmission power designation information based on said reception level; and a transmission unit that transmits said modulation scheme designation information and said transmission power designation information to said transmitter.