 Modulation is the process of encoding information a

message source in a manner suitable for transmition.

 The ultimate goal of a modulation technique is to transport the

message signal through a radio channel with the best possible

quality while occupying the least amount of radio spectrum.-

　Modulation is the process of encoding information　a

message source in a manner suitable for transmition.

　The ultimate goal of a modulation technique is to transport the

message signal through a radio channel with the best possible

quality while occupying the least amount of radio spectrum.