# US 2020/0396018 A1 · Data processing method, precoding method, and communication device

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- Number: US 2020/0396018 A1
- Document ID: US20200396018A1
- Status: Published application
- Kind: A1
- Application number: 17/007,149
- Filed: 2020-08-31
- Published: 2020-12-17
- Earliest claimed: 2013-01-11
- Assignees: Sun Patent Trust
- Applicants: Sun Patent Trust
- Inventors: Yutaka MURAKAMI; Tomohiro KIMURA; Mikihiro OUCHI
- Web page: https://patentgrep.com/patent/US20200396018A1

## CPC

- H04L 1/0004: {applied to control information}
- H03M 13/255: {with Low Density Parity Check [LDPC] codes}
- H04B 7/0413: MIMO systems
- H04L 1/0003: {by switching between different modulation schemes}
- H04L 1/003: {Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits}
- H04L 1/0057: {Block codes (H04L1/0061, H04L1/0064 take precedence)}
- H04L 1/0067: {Rate matching (H04L1/0013 and H04L1/08 take precedence)}
- H04L 1/0071: {Use of interleaving (interleaving per se H03M13/27)}
- H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)}
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)
- H04B: TRANSMISSION

## Abstract

An encoder outputs a first bit sequence having N bits. A mapper generates a first complex signal s1 and a second complex signal s2 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 s1, and Y indicates the number of bits used to generate the second complex signal s2. 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.

## Claims

### Claim 1

A transmission method comprising:
encoding first information according to a first coding rate and a first code length to generate a first encoded data sequence;
encoding second information according to the first coding rate and a second code length to generate a second encoded data sequence, the second code length being different from the first code length;
mapping the first encoded data sequence onto 16 signal points defined by a first 16 Quadrature Amplitude Modulation (QAM) scheme to generate a first modulation symbol sequence;
mapping the second encoded data sequence onto 16 signal points defined by a second 16 QAM scheme to generate a second modulation symbol sequence;
generating pilot symbols which are known symbols between a transmission device and a reception device;
generating a first Orthogonal Frequency Division Multiplexing (OFDM) symbol based on the first modulation symbol sequence and the pilot symbols;
generating a second OFDM symbol based on the second modulation symbol sequence and the pilot symbols;
transmitting a signal generated based on the first OFDM symbol and the second OFDM symbol, wherein
the 16 signal points are representable on an I/Q plane having a real axis and an imaginary axis such that a distance between adjacent signal points has nonuniformity,
the 16 signal points defined by the first 16 QAM scheme have a first arrangement pattern on the I/Q plane, and
the 16 signal points defined by the second 16 QAM scheme have a second arrangement pattern on the I/Q plane different from the first arrangement pattern.

### Claim 2

A reception method comprising:
receiving a signal including a first Orthogonal Frequency Division Multiplexing (OFDM) symbol and a second OFDM symbol;
extracting pilot symbols from the first OFDM symbol and the second OFDM symbol, a first modulation symbol sequence from the first OFDM symbol, and a second modulation symbol sequence from the second OFDM symbol, the pilot symbols being known symbols between a transmission device and a reception device;
demodulating the first modulation symbol sequence mapped on 16 signal points defined by a first 16 Quadrature Amplitude Modulation (QAM) scheme to generate a first encoded data sequence based on the pilot symbols;
demodulating the second modulation symbol sequence mapped on 16 signal points defined by a second 16 QAM scheme to generate a second encoded data sequence based on the pilot symbols;
decoding the first encoded data sequence according to a first coding rate and a first code length to generate first information; and
decoding the second encoded data sequence according to the first coding rate and a second code length to generate second information, the second code length being different from the first code length, wherein
the 16 signal points are representable on an I/Q plane having a real axis and an imaginary axis such that a distance between adjacent signal points has nonuniformity,
the 16 signal points defined by the first QAM scheme have a first arrangement pattern on the I/Q plane, and
the 16 signal points defined by the second 16 QAM scheme have a second arrangement pattern on the I/Q plane different from the first arrangement pattern.

### Claim 3

A reception device comprising:
receiving circuitry configured to receive a signal including a first Orthogonal Frequency Division Multiplexing (OFDM) symbol and a second OFDM symbol;
OFDM symbol processing circuitry configured to extract pilot symbols from the first OFDM symbol and the second OFDM symbol, a first modulation symbol sequence from the first OFDM symbol, and a second modulation symbol sequence from the second OFDM symbol, the pilot symbols being known symbols between a transmission device and the reception device;
demapping circuitry configured to demodulate the first modulation symbol sequence mapped on 16 signal points defined by a first 16 Quadrature Amplitude Modulation (QAM) scheme to generate a first encoded data sequence based on the pilot symbols, the demapping circuitry being configured to demodulate the second modulation symbol sequence mapped on 16 signal points defined by a second 16 QAM scheme to generate a second encoded data sequence based on the pilot symbols; and
decoding circuitry configured to decode the first encoded data sequence according to a first coding rate and a first code length to generate first information, the decoding circuitry being configured to decode the second encoded data sequence according to the first coding rate and a second code length to generate second information, the second code length being different from the first code length,
wherein
the 16 signal points are representable on an I/Q plane having a real axis and an imaginary axis such that a distance between adjacent signal points has nonuniformity,
the 16 signal points defined by the first 16 QAM scheme have a first arrangement pattern on the I/Q plane, and
the 16 signal points defined by the second 16 QAM scheme have a second arrangement pattern on the I/Q plane different from the first arrangement pattern.