Single-carrier receiver having a channel equalizer interacting with a Trellis decoder and a channel equalization method therefor

A channel equalization method for a signal-carrier receiver, comprising:

• first equalizing an input signal by eliminating pre-ghost and post-ghost of the input signal using a first feed forward (FF) unit and a first feedback (FB) unit;
• Trellis-decoding a result of the first equalizing of the input signal;
• and
• second equalizing a result of the Trellis-decoding, comprising eliminating the pre-ghost of the input signal in a second FF unit and eliminating the post-ghost of the input signal in a second FB unit based on the the result of the Trellis-decoding.

A channel equalizer for a single-carrier receiver, comprising:

• a first equalizer having a first FF unit to eliminate a pre-ghost of an input signal, a first FB unit to eliminate a post-ghost of the input signal, and a first error calculation unit to calculate a first equalization error value based on an added signal of an output signal of the first FF unit and an output signal of the first FB unit;
• a buffer to store the input signal input to the first equalizer for a certain period of time;
• a Trellis decoder having an entire decoding depth of N and an entire traceback delay symbol length of N×K, with N and K being natural numbers, and Trellis-decode an output signal of the first equalizer;
• a Trellis controller to control the Trellis decoder to output to the first FB unit an estimation signal output in a predetermined decoding depth state of the Trellis decoder if the first equalization error value becomes less than or equal to a threshold value;
• and
• a second equalizer having a second FF unit to eliminate the pre-ghost of the input signal output from the buffer and a second FB unit to eliminate the post-ghost of the input signal based on an output of the Trellis decoder.

A channel equalizer for a single-carrier receiver, comprising:

• a first equalizer having a first feed forward (FF) unit to eliminate a pre-ghost of an input signal, a first feedback (FB) unit to eliminate a post-ghost of the input signal, and a first error calculation unit to calculate a first equalization error value based on an added signal of an output signal of the first FF unit and an output signal of the first FB unit;
• a buffer to store the input signal input to the first equalizer for a certain period of time;
• a Trellis decoder having an entire decoding depth of N and an entire traceback delay symbol length of N×K, with N and K being natural numbers, and Trellis-decode an output signal of the first equalizer;
• a Trellis controller to control the Trellis decoder to output to the first FB unit plural estimation signals output in plural states of entire decoding depths of the Trellis decoder, if the first equalization error value becomes less than or equal to a threshold value;
• and
• a second equalizer having a second FF unit to eliminate the pre-ghost of the input signal output from the buffer and a second FB unit to eliminate the post-ghost of the input signal, based on an output of the Trellis decoder.

A channel equalizer for a single-carrier receiver, comprising:

• a first equalizer having a first feed forward (FF) unit to eliminate a pre-ghost of an input signal, and a first feedback (FB) unit to eliminate a post-ghost of the input signal;
• a buffer to store the input signal input to the first equalizer for a certain period of time;
• a Trellis decoder having a decoding depth of N and an entire traceback delay symbol length of N×K, with N and K being natural numbers, and to Trellis-decode an output signal of the first equalizer;
• and
• a second equalizer having a second FF unit to eliminate the pre-ghost of the input signal output from the buffer, a second FB unit to eliminate the post-ghost of the input signal based on an output of the Trellis decoder, and a second error calculation unit to calculate a second equalization error value based on the output of the Trellis decoder.

A channel equalizer for a single-carrier receiver, comprising:

• a first equalizer having a first feed forward (FF) unit to eliminate a pre-ghost of an input signal, a first feedback (FB) unit to eliminate a post-ghost of the input signal, and a first error calculation unit to calculate a first equalization error value based on an added signal of an output signal of the first FF unit and an output signal of the first FB unit;
• a buffer for storing the input signal input to the first equalizer for a certain period of time;
• a Trellis decoder having an entire decoding depth of N and an entire traceback delay symbol length of N×K, with N and K being, and Trellis-decode an output signal of the first equalizer;
• a Trellis controller to control the Trellis decoder to output to the first FB unit an estimation signal output in a predetermined decoding depth state of the Trellis decoder if the first equalization error value becomes less than or equal to a threshold value;
• and
• a second equalizer having a second FF unit to eliminate the pre-ghost of the input signal output from the buffer, a second FB unit to eliminate the post-ghost of the input signal based on an output of the Trellis decoder, and a second error calculation unit to calculate a second equalization error value based on the output of the Trellis decoder.

A channel equalizer for a single-carrier receiver, comprising:

• a first equalizer having a first feed forward (FF) unit to eliminate a pre-ghost of an input signal, a first feed back (FB) unit to eliminate a post-ghost of the input signal, and a first error calculation unit to calculate a first equalization error value based on an added signal of an output signal of the first FF unit and an output signal of the first FB unit;
• a buffer to store the input signal input to the first equalizer for a certain period of time;
• a Trellis decoder having an entire decoding depth of N and an entire traceback delay symbol length of N×K, with N and K being natural numbers, and to Trellis-decode an output signal of the first equalizer;
• a Trellis controller to control the Trellis decoder to input to the first FB unit plural estimation signals output in plural states of the entire decoding depths of the Trellis decoder, if the first equalization error value becomes less than or equal to a threshold value;
• and
• a second equalizer having a second FF unit to eliminate the pre-ghost of the input signal output from the buffer, a second FB unit to eliminate the post-ghost of the input signal based on an output of the Trellis decoder, and a second error calculation unit to calculate a second equalization error value based on the output of the Trellis decoder.

A receiver, comprising:

• a demodulator to convert a received signal to a baseband signal;
• a channel equalizer to compensate for channel distortions in the demodulated received signal;
• a phase recovery unit to recover a phase of the channel equalized signal;
• and
• a decoder to decode the phase recovered signal,
• wherein the channel equalizer further comprises a first equalizer having a first feed forward (FF) unit to eliminate a pre-ghost of a channel equalizer input signal and a first feedback (FB) unit to eliminate a post-ghost of the channel equalizer input signal, a Trellis decoder to Trellis-decode an output signal of the first equalizer, and a second equalizer having a second FF unit to eliminate the pre-ghost of the channel equalizer channel equalizer signal and a second FB unit to eliminate the post-ghost of the channel equalizer input signal based on an signal decoded by the Trellis decoder.