Wireless communication system, wireless communication device, receiver, control circuit, and storage medium

A wireless communication device comprising:

• a transmitter comprising:
• a coder to generate a first bit sequence by performing convolutional coding on an information bit on the basis of a code rate;
• a bit eraser to generate a second bit sequence by erasing one or more bits from the first bit sequence for every predetermined first number of bits;
• and
• a modulator to generate a symbol by modulation using the second bit sequence;
• and
• a receiver comprising:
• a demodulator to calculate a plurality of first reliabilities that are reliabilities of a plurality of bit sequences that can be derived from the symbol;
• a likelihood extender to generate a plurality of extended bit sequences that are bit sequences each composed of bits for the first number of bits, and generate a plurality of second reliabilities that are reliabilities of the plurality of extended bit sequences by assigning a plurality of first reliabilities duplicated, as the reliabilities of the plurality of extended bit sequences;
• and
• a decoder to create a trellis diagram using the code rate and the plurality of extended bit sequences, and perform decoding by assigning the plurality of second reliabilities to a plurality of branches of the trellis diagram.

A receiver comprising:

• a demodulator to calculate a plurality of first reliabilities that are reliabilities of a plurality of bit sequences that can be derived from the symbol transmitted by a transmitter including a coder to generate a first bit sequence by performing convolutional coding on an information bit on the basis of a code rate, a bit eraser to generate a second bit sequence by erasing one or more bits from the first bit sequence for every predetermined first number of bits, and a modulator to generate a transmission symbol by modulation using the second bit sequence;
• a likelihood extender to generate a plurality of extended bit sequences that are bit sequences each composed of bits for a predetermined number of bits, and generate a plurality of second reliabilities that are reliabilities of the plurality of extended bit sequences by assigning a plurality of first reliabilities duplicated, as the reliabilities of the plurality of extended bit sequences;
• and
• a decoder to create a trellis diagram using the plurality of extended bit sequences, and perform decoding by assigning the plurality of second reliabilities to a plurality of branches of the trellis diagram.

A control circuit by which a transmitter and a receiver are controlled,

• the control circuit causing the transmitter to implement:
• a first step of generating a first bit sequence by performing convolutional coding on an information bit on the basis of a code rate;
• a second step of generating a second bit sequence by erasing one or more bits from the first bit sequence for every predetermined first number of bits;
• and
• a third step of generating a symbol by modulation using the second bit sequence, and
• the control circuit causing the receiver to implement:
• a fourth step of calculating a plurality of first reliabilities that are reliabilities of a plurality of bit sequences that can be derived from the symbol;
• a fifth step of generating a plurality of extended bit sequences that are bit sequences each composed of bits for the first number of bits, and generating a plurality of second reliabilities that are reliabilities of the plurality of extended bit sequences by assigning a plurality of first reliabilities duplicated, as the reliabilities of the plurality of extended bit sequences;
• and
• a sixth step of creating a trellis diagram using the code rate and the plurality of extended bit sequences, and performing decoding by assigning the plurality of second reliabilities to a plurality of branches of the trellis diagram.

A storage medium in which a program is stored, the program being configured to control a transmitter and a receiver,

• the program causing the transmitter to implement:
• a first step of generating a first bit sequence by performing convolutional coding on an information bit on the basis of a code rate;
• a second step of generating a second bit sequence by erasing one or more bits from the first bit sequence for every predetermined first number of bits;
• and
• a third step of generating a symbol by modulation using the second bit sequence, and
• the program causing the receiver to implement:
• a fourth step of calculating a plurality of first reliabilities that are reliabilities of a plurality of bit sequences that can be derived from the symbol;
• a fifth step of generating a plurality of extended bit sequences that are bit sequences each composed of bits for the first number of bits, and generating a plurality of second reliabilities that are reliabilities of the plurality of extended bit sequences by assigning a plurality of first reliabilities duplicated, as the reliabilities of the plurality of extended bit sequences;
• and
• a sixth step of creating a trellis diagram using the code rate and the plurality of extended bit sequences, and performing decoding by assigning the plurality of second reliabilities to a plurality of branches of the trellis diagram.