Patent ID: 8880982

Claim:
A radio communication apparatus comprising: an encoding section configured to obtain a codeword sequence by encoding a fixed information block formed with K bits; and a modulation section configured to perform m-ary modulation on the codeword sequence, by dividing the codeword sequence into a first codeword subsequence and a second codeword subsequence, and by mapping bits in the first codeword subsequence and bits in the second codeword subsequence to symbols, wherein, each of the symbols has a first bit position and a second bit position, the first bit position having a higher bit error rate than the second bit position, the first codeword subsequence includes a systematic bit and a parity bit which have been obtained by encoding a head part and a tail part of the fixed information block, the second codeword subsequence includes bits which have been obtained by encoding a center part of the fixed information block, the center part being not including the head part and the tail part, and the modulation section is configured to map, the systematic bit in the first codeword subsequence to the first bit position and the parity bit in the first subsequence to the second bit position.