DSL modem apparatus and communication control method for DSL communication

A DSL modem apparatus comprising:

• a receiver that receives an analog signal modulated with a multi-carrier method;
• a gain controller that controls a gain amount of the received analog signal;
• an AD converter that samples the received analog signal processed by said gain controller and outputs sampling data;
• a demodulator that performs a Fourier transform on the sampling data per symbol unit, demodulates the data into a carrier unit, and outputs demodulated data;
• a sync symbol retriever that retrieves a sync symbol from the demodulated data, the sync symbol being transmitted from an opposing side after data communication is initiated using the multi-carrier method;
• and
• an FEQ unit that corrects a gain and topology of a plurality of carriers within the retrieved sync symbol so that a reception point for each carrier is moved to a target point.

A DSL modem apparatus comprising:

• a demodulator that demodulates reception data retrieved from a line into a carrier unit and outputs demodulated data;
• a sync symbol retriever that retrieves a sync symbol from the demodulated data, the sync symbol being transmitted from an opposing side after data communication is initiated using a multi-carrier method;
• and
• a controller that enables a gain control based on individual signal value of a plurality of carriers within the retrieved sync symbol.

A DSL modem apparatus comprising:

• a demodulator that demodulates reception data retrieved from a line into a carrier unit and outputs demodulated data;
• a sync symbol retriever that retrieves a sync symbol from the demodulated data, the sync symbol being transmitted from an opposing side after data communication is initiated using a multi-carrier method;
• and
• an FEQ unit that corrects a gain and topology of a plurality of carriers within the retrieved sync symbol so that a reception point for each carrier is moved to a target point.

A DSL modem apparatus comprising:

• a demodulator that demodulates reception data retrieved from a line into a carrier unit and outputs demodulated data;
• a specific symbol retriever that retrieves a known symbol from the demodulated data, the known symbol being transmitted from an opposing side after data communication is initiated using a multi-carrier method;
• and
• a controller that enables a gain control based on individual signal value of a plurality of carriers within the retrieved known symbol,
• wherein fixed bits are assigned to each carrier of the known symbol, the fixed bits having 2 bits.

A DSL modem apparatus comprising:

• a demodulator that demodulates reception data retrieved from a line into a carrier unit and outputs demodulated data;
• a known symbol retriever that retrieves a known symbol from the demodulated data, the known symbol being transmitted from an opposing side after data communication is initiated using a multi-carrier method;
• and
• an FEQ unit that corrects a gain and topology of a plurality of carriers within the retrieved known symbol so that a reception point for each carrier is moved to a target point,
• wherein fixed bit of 2 bits are assigned to each carrier of the known symbol.

A communication control method comprising:

• demodulating reception data retrieved from a line into a carrier unit and outputting demodulated data;
• retrieving a sync symbol from the demodulated data, the sync symbol being transmitted from an opposing side after data communication is initiated using a multi-carrier method;
• and
• enabling a gain control based on individual signal value of a plurality of carriers within the retrieved sync symbol.

A communication control method comprising:

• demodulating reception data retrieved from a line into a carrier unit and outputting demodulated data;
• retrieving a sync symbol from the demodulated data, the sync symbol being transmitted from an opposing side after data communication is initiated using a multi-carrier method;
• and
• correcting a gain and topology of a plurality of carriers within the retrieved sync symbol so that a reception point for each carrier is moved to a target point.