Rate adjustment apparatus and method, and communication apparatus

A communication apparatus comprising:

• a communication circuitry configured to transmit and receive error correction encoded data;
• and
• a processor coupled to the communication circuitry, configured to:
• calculate a first parameter for use as one of a plurality of judgment values;
• calculate a second parameter for each of a plurality of processing units into which input data is divided, the second parameter being used as another of the plurality of judgment values;
• the second parameter being based upon a relationship between two processing units of the plurality of processing units;
• receive the judgment values with respect to a set of bits forming each of the processing units, and deletes bits from or adds bits to the set of bits based on the judgment values;
• judge comparative magnitudes of an increment value included in the first parameter, and a computation portion of a recurrence equation corresponding to one of the two processing units with respect to which the relationship between the judgment values is represented by the recurrence equation;
• and
• obtain the second parameter for the other processing unit by subtracting the increment value from the computation portion, when it is judged as a result of judgment that the computation portion is larger than the increment value.

A rate adjustment method comprising:

• calculating a first parameter for use as one of a plurality of judgment values used;
• sequentially and recursively calculating a second parameter for each of a plurality of processing units into which input data is divided, the second parameter being used as another of the plurality of judgment values;
• the second parameter being based upon a relationship between two processing units of the plurality of processing units;
• receiving the judgment values with respect to a set of bits forming each of the processing units;
• deleting or adding to the set of bits based on the judgment values;
• judging comparative magnitudes of an increment value included in the first parameter;
• and
• subtracting the increment value from a computation portion, when it is judged as a result of the judging that the computation portion is larger than the increment value.