Disclosed is radio equipment for transmission and reception of Frequency
Division Duplex mode signals and transmission signal characteristic
compensation utilizing small-scaled circuit construction. A receiver
converts Radio Frequency band signals from an antenna sharer to an
Intermediate Frequency (IF) via a mixer and into digital signals
utilizing an Analog-to Digital Converter. Reception signals and image
signals of transmission signals, both having an IF A are contained in the
converted signals, are converted into reception signals having an IF B
and image signals having an IF C, respectively, which both have positive
and negative carrier frequencies symmetrical to a zero frequency direct
current component and are represented as a complex number. A transmitter
converts the IF C into a baseband of image signals, and compensates
signal characteristics relative to complex baseband signals of quantized
transmission signals at a characteristic compensator using converted
signals as reference signals.