CARRIER RECOVERY APPARATUS FOR USING RECEIVER OF QUADRATURE AMPLITUDE MODULATION AND METHOD FOR RECOVERING CARRIER THE REOF

摘要

Carrier recovery device for Quadrature Amplitude Modulation (QAM) receiver, which has fast convergence speed to acquire carrier even at M-ary QAM device with high M value, and at the same time, can perform carrier tracking while minimizing phase vibration And to provide a carrier recovery method using the same, the carrier recovery apparatus for achieving the above object is a main determiner for receiving the I, Q received data received through the channel and outputting the decision data, I, Q received data A sub-determiner that receives data belonging to layer 1 of the middle layer (data having only one data having the same size in one quadrant) and outputs decision data, and optionally connects the sub-determinator or the main determinant to a decision data value. A phase error for detecting a phase error of the decision data selector to be output and the decision data output from the I and Q reception data and the decision data selector. A phase discriminator that receives the I, Q received data and determines whether it belongs to the layer 1 or not, and outputs a current phase error as it is or according to a previously detected phase according to the output signal of the layer discriminator. A pass / maintain that maintains the error as it is, a loop filter that removes noise in the output signal of the pass / maintain, and outputs only a pure phase error, and detects whether the output signal of the loop filter acquires a carrier wave A carrier acquisition detector for transmitting a detection signal and a voltage controlled oscillator for recovering a carrier required to demodulate the transmission signal in response to the output signal of the loop filter.