Data processing method, precoding method, and communication device
An encoder outputs a first bit sequence having N bits. A mapper generates a first complex signal s 1 and a second complex signal s 2 with use of bit sequence having X+Y bits included in an input second bit sequence, where X indicates the number of bits used to generate the first complex signal s 1 , and Y indicates the number of bits used to generate the second complex signal s 2 . A bit length adjuster is provided after the encoder, and performs bit length adjustment on the first bit sequence such that the second bit sequence has a bit length that is a multiple of X+Y, and outputs the first bit sequence after the bit length adjustment as the second bit sequence. As a result, a problem between a codeword length of a block code and the number of bits necessary to perform mapping by a set of modulation schemes is solved.
1. A transmission device comprising:
error correction encoding circuitry which, in operation, generates a first encoded data sequence from an input data sequence using a first coding rate and a first code length, and generates a second encoded data sequence from a control information sequence using a second coding rate and a second code length;
mapping circuitry which, in operation, generates a first modulation symbol sequence by applying a Quadrature Phase Shift Keying (QPSK) modulation scheme or a 64 Quadrature Amplitude Modulation (QAM) scheme to the first encoded data sequence, and generates a second modulation symbol sequence by applying the QPSK modulation scheme or the 64QAM scheme to the second encoded data sequence; and
transmitting circuitry which, in operation, transmits the first modulation symbol sequence and the second modulation symbol sequence, wherein
the first code length and the second code length are different from each other,
the first coding rate and the second coding rate are the same,
the mapping circuitry generates (i) the first modulation symbol sequence and the second modulation symbol sequence by using same mapping pattern when the QPSK modulation scheme is used, (ii) the first modulation symbol sequence and second modulation symbol sequence by using different mapping patterns when the 64 QAM scheme is used.
2. A reception device comprising:
control information demapping circuitry which, in operation, demodulates an encoded control information sequence from a reception signal, the encoded control information sequence being obtained by demapping a second modulation symbol sequence included in the reception signal using a Quadrature Phase Shift Keying (QPSK) modulation scheme or a 64 Quadrature Amplitude Modulation (QAM) scheme;
control information decoder circuitry which, in operation, decodes the encoded control information sequence having a second coding rate;
demapping circuitry which, in operation, demodulates a first encoded data sequence based on the decoded control information sequence, the first encoded data sequence being obtained by demapping a first modulation symbol sequence included in the reception signal using the QPSK modulation scheme or the 64QAM scheme; and
decoding circuitry which, in operation, decodes the first encoded data sequence having a first coding rate based on the decoded control information sequence, wherein
the decoded control information sequence includes information of the QPSK modulation scheme or the 64QAM scheme, a code length of the first encoded data sequence, and the first coding rate,
the first code length and the second code length are different from each other,
the first coding rate and the second coding rate are the same,
the control information demapping circuitry demodulates the second modulation symbol sequence by using either a first mapping pattern of the QPSK modulation scheme or a first mapping pattern of the 64 QAM scheme, and
the demapping circuitry demodulates the first modulation symbol sequence by using either the first mapping pattern of the QPSK modulation scheme or a second mapping patterns of the 64 QAM scheme, the second mapping patterns of the 64 QAM scheme being different from the first mapping patterns of the 64 QAM scheme.
3. A transmission method comprising:
generating a first encoded data sequence from an input data sequence using a first coding rate and a first code length, and generating a second encoded data sequence from a control information sequence using a second coding rate and a second code length;
generating a first modulation symbol sequence by applying a Quadrature Phase Shift Keying (QPSK) modulation scheme or a 64 Quadrature Amplitude Modulation (QAM) scheme to the first encoded data sequence, and generating a second modulation symbol sequence by applying the QPSK modulation scheme or the 64QAM scheme to the second encoded data sequence; and
transmitting the first modulation symbol sequence and the second modulation symbol sequence, wherein
the first code length and the second code length are different from each other,
the first coding rate and the second coding rate are the same,
(i) the first modulation symbol sequence and the second modulation symbol sequence are generated by using same mapping pattern when the QPSK modulation scheme is used, and
(ii) the first modulation symbol sequence and second modulation symbol sequence are generated by using different mapping patterns when the 64 QAM scheme is used.
4. A reception method comprising:
demodulating an encoded control information sequence from a reception signal, the encoded control information sequence being obtained by demapping a second modulation symbol sequence included in the reception signal using a Quadrature Phase Shift Keying (QPSK) modulation scheme or a 64 Quadrature Amplitude Modulation (QAM) scheme;
decoding the encoded control information sequence having a second coding rate;
demodulating a first encoded data sequence based on the decoded control information sequence, the first encoded data sequence being obtained by demapping a first modulation symbol sequence included in the reception signal using the QPSK modulation scheme or the 64QAM scheme; and
decoding the first encoded data sequence having a first coding rate based on the decoded control information sequence, wherein
the decoded control information sequence includes information of the QPSK modulation scheme or the 64QAM scheme, a code length of the first encoded data sequence, and the first coding rate,
the first code length and the second code length are different from each other,
the first coding rate and the second coding rate are the same,
the second modulation symbol sequence is demodulated by using either a first mapping pattern of the QPSK modulation scheme or a first mapping pattern of the 64 QAM scheme, and
the first modulation symbol sequence is demodulated by using either the first mapping pattern of the QPSK modulation scheme or a second mapping patterns of the 64 QAM scheme, the second mapping patterns of the 64 QAM scheme being different from the first mapping patterns of the 64 QAM scheme.