Transmission apparatus, reception apparatus, communication system, circuit apparatus, communication method, and program

A reception apparatus communicatively coupled to a transmission apparatus, the reception apparatus comprising:

• a reception section that receives signals included in a received symbol sequence sent from the transmission apparatus;
• and
• an error correcting section that corrects an error in the received symbol sequence,
• wherein a comparison between the received symbol sequence and a received symbol sequence with corrected error indicates that the received symbol sequence with corrected error includes at least a change in a symbol position of a symbol received when or after an index value for a total amount of bias of a signal level calculated from a reference point in time falls out of a predetermined reference range, wherein the change in the symbol position serves to reduce a bias of a signal level.

A communication system comprising a reception apparatus and a transmission apparatus communicatively coupled to the reception apparatus, the transmission apparatus comprising:

• a monitoring section configured to monitor an index value for a total amount of bias of a signal level in signals;
• a symbol identifying section configured to identify a target symbol to be changed in a transmission symbol sequence comprising the signals, based on the index value for the total amount of bias of the signal level;
• a symbol position changing section configured to change a position of the target symbol to a position of a signal point where the bias of the signal level is reduced;
• and
• a transmission section configured to transmit signals included in the changed transmission symbol sequence to the reception apparatus, and
• the reception apparatus comprising:
• a reception section configured to receive signals included in a received symbol sequence sent from the transmission apparatus;
• and
• an error correcting section configured to correct an error in the received symbol sequence.

A circuit apparatus generating a signal output to a succeeding stage via a coupling element, the circuit apparatus comprising:

• a monitoring section that monitors an index value for a total amount of bias of a signal level in signals;
• a symbol identifying section that identifies a target symbol to be changed in a transmission symbol sequence comprising the signals, based on the index value for the total amount of bias of the signal level;
• a symbol position changing section that changes a position of the target symbol to a position of a signal point serving to reduce a bias of the signal level;
• and
• an output section that outputs signals included in the changed transmission symbol sequence to a succeeding stage.

A communication method carried out between a reception apparatus and a transmission apparatus communicatively coupled to the reception apparatus, the communication method comprising the steps of:

• monitoring, using the transmission apparatus, an index value for a total amount of bias of a signal level in signals;
• identifying, using the transmission apparatus, a target symbol to be changed in a transmission symbol sequence including the signals, based on the index value for the total amount of bias of the signal level;
• changing, using the transmission apparatus, a position of the target symbol to a position of a signal point serving to reduce the bias of the signal level;
• and
• transmitting, using the transmission apparatus, signals included in the changed transmission symbol sequence to the reception apparatus.