| 摘要 |
Provided is a carrier recovery apparatus of an OOB QPSK receiver for an Open Cable System. The carrier recovery apparatus of the digital broadcast receiver includes a carrier recovery, an SNR calculator, a false lock generator, and an integrator. The carrier recovery receives a digital broadcast signal, multiplies the signal by a carrier frequency offset, and compensates a distorted phase before converting into a last bandwidth. The SNR calculator obtains an average in an interval determined by accumulating an inputted inter-symbol mean squared error (MSE) to calculate an SNR. The false lock detector receives the SNR calculated at the SNR calculator for its input to generate a false reset signal for preventing convergence from being performed to a false direction before converting into a last bandwidth of a lock detector. The integrator receives a false reset signal from the false lock detector, for its input to initialize a register of an integral part.
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