Apparatus for recovering decision-directed carrier

An apparatus for recovering carrier of an input signal from outside, the apparatus comprising:

• a) means for generating a first conjugate complex sample in accordance with an received complex number;
• b) means for receiving the first conjugate complex sample and for recovering a carrier frequency of the first conjugate complex sample by compensating a carrier frequency offset of the input signal;
• c) means for receiving the first conjugate complex sample and for recovering a carrier phase of the input signal by compensating a carrier phase offset of the input signal;
• and
• d) means for selecting a symbol in accordance with the output value from said means c) and for outputting the selected symbol to said means a),
• wherein the means b) includes:
• a second delay means for delaying the output signal of said first delay means;
• a first multiplier for multiplying the first conjugate complex sample by the output signal of said second delay means;
• a phase offset detecting means for detecting a phase offset from the output signal of said first multiplier;
• a means for generating a second conjugate complex sample;
• a second multiplier for multiplying the output signal of said first delay means by the second conjugate complex sample;
• and
• a third delay means for delaying and outputting the outputting the output signal of second multiplier to said means c).