Carrier and symbol timing recovery apparatus usable with a vestigial side band receiver and recovery method thereof

A recovery apparatus usable with a digital broadcast receiver, the apparatus comprising:

• a receiving unit to receive a signal having a carrier and a clock on a wireless channel and to generate a baseband signal from the received signal;
• an error detector to detect error information in at least two portions of the baseband signal;
• and
• a carrier generator to generate a frequency offset adjusted carrier by combining the detected error information of the at least two portions of the baseband signal.

A digital broadcast receiver, comprising:

• a carrier and symbol timing recovery apparatus, comprising:
• an error detector to receive a baseband signal and to detect a first error relating to a phase of a pilot signal thereof, a second error relating to a phase of a lower sideband thereof, and a third error relating to a phase of an upper sideband thereof;
• and
• a recovery unit to determine whether any of the pilot signal, the upper sideband, and the lower sideband are corrupted, to recover an original clock and an original carrier according to at least one of the first, second, and third errors based on the determination, and to output the original clock and the original carrier.

An error and symbol timing recovery method usable in a Vestigial Side Band (VSB) receiver, the method comprising:

• receiving a VSB-modulated signal and converting the received VSB-modulated signal to a digital signal using a predetermined sampling clock;
• multiplying the digital signal by a carrier signal of a predetermined frequency and converting a result of multiplication to a baseband VSB signal;
• performing a predetermined algorithm on an upper sideband and a lower sideband of the baseband VSB signal, respectively, and generating upper error information and lower error information based on a difference between phase information of the received VSB-modulated signal and a predetermined reference phase information;
• combining the upper error information and the lower error information and generating a frequency offset-corrected carrier therefrom;
• and
• combining the upper error information and the lower error information and generating a symbol clock error-corrected sampling clock.

A method of recovering a carrier and symbol timing usable with a VSB receiver, the method comprising:

• receiving a signal having a carrier and a clock on a wireless channel;
• determining phase information for at least a first portion of the received signal and a second portion of the received signal;
• generating a first error information and a second error information to correspond with the first portion and the second portion of the received signal, respectively, by comparing the phase information of the first and second portions with a reference phase information;
• and
• combining the first error information and the second error information to produce a frequency offset-corrected carrier and symbol clock error-corrected sampling clock.

A method of recovering a carrier and a symbol timing usable in a digital broadcast receiver, the method comprising:

• receiving a baseband signal and detecting a first error relating to a phase of a pilot signal thereof, a second error relating to a phase of a lower sideband thereof, and a third error relating to a phase of an upper sideband thereof;
• determining whether any of the pilot signal, the upper sideband, and the lower sideband are corrupted;
• and
• recovering an original clock and an original carrier according to at least one of the first, second, and third errors based on the determination and outputting the original clock and the original carrier used at a transmitting device.

A recovery method, comprising:

• receiving a baseband VSB signal;
• detecting a frequency offset of a pilot signal, an upper sideband, and a lower sideband;
• and
• generating a frequency offset corrected carrier using the detected frequency offsets of the pilot signal, the upper sideband, and the lower sideband.