# US 12,192,000 B2 · Wireless communication base station apparatus, wireless communication terminal, communication method of a wireless communication base station apparatus and communication method of a wireless communication terminal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,000 B2 - Document ID: US12192000B2 - Status: Granted - Kind: B2 - Application number: 18/532,791 - Filed: 2023-12-07 - Published: 2024-04-04 - Granted: 2025-01-07 - Earliest claimed: 2006-11-02 - Assignees: Panasonic Intellectual Property Corporation of America - Applicants: Panasonic Intellectual Property Corporation of America - Inventors: Yutaka Murakami; Shutai Okamura; Kiyotaka Kobayashi; Masayuki Orihashi; Kazuaki Takahashi - Web page: https://patentgrep.com/patent/US12192000B2 ## CPC - H04L 1/0071: {Use of interleaving (interleaving per se H03M13/27)} - H03M 13/15: Cyclic codes, i.e. cyclic shifts of codewords produce other codewords, e.g. codes defined by a generator polynomial, Bose-Chaudhuri-Hocquenghem [BCH] codes (H03M13/17 takes precedence) - H04L 1/0003: {by switching between different modulation schemes} - H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)} - H04L 1/0059: {Convolutional codes} - H04L 1/22: using redundant apparatus to increase reliability - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 27/0008: {arrangements for allowing a transmitter or receiver to use more than one type of modulation (negotiating modulation type for two-way transmission paths H04L5/1453)} - H04L 27/36: Modulator circuits; Transmitter circuits - H04L 27/38: Demodulator circuits; Receiver circuits - H04L 27/2647: {Arrangements specific to the receiver only (equalisation H04L27/01)} - 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) ## Abstract A transmitter apparatus wherein a simple structure is used to successfully suppress the degradation of error rate performance that otherwise would be caused by fading or the like. There are included encoding parts that encode transport data; a mapping part that performs such a mapping that encoded data sequentially formed by the encoding parts are not successively included in the same symbol, thereby forming data symbols; and a symbol interleaver that interleaves the data symbols. In this way, a low computational complexity can be used to perform an interleaving process equivalent to a bit interleaving process to effectively improve the reception quality at a receiving end. ## Claims ### Claim 1 A circuit comprising: reception circuitry, which, in operation, controls receiving a combined signal transmitted from at least an antenna; and demodulation circuitry, which, in operation, controls demodulating the combined signal, wherein the combined signal is generated by generating two codeword signals by encoding data, by generating a first mapping signal and a second mapping signal by mapping each of the two codeword signals on at least one of an in-phase/quadrature phase (I-Q) plane corresponding to a quadrature phase-shift keying (QPSK) scheme and an I-Q plane corresponding to a 16 quadrature amplitude modulation (16QAM) scheme, by arranging the second mapping signal by using an equation having an angle that is not equal to zero, and by combining the first mapping signal and a phase-rotated second mapping signal arranged using the equation to generate a combined signal; and wherein a first codeword of the two codeword signals includes a first cyclic redundancy check (CRC) bits relating to the first codeword, and a second codeword of the two codeword signals includes a second cyclic redundancy check (CRC) bits relating to the second codeword, and wherein the combined signal includes at least one data of the first codeword and one data of the second codeword on each symbol. ### Claim 2 (depends on 1) The circuit according to claim 1, wherein the combined signal is transmitted from two or more antennas. ### Claim 3 (depends on 1) The circuit according to claim 1, wherein each of the first codeword and the second codeword is coded by a Low Density Parity Check (LDPC) code. ### Claim 4 (depends on 1) The circuit according to claim 1, wherein each size of the first codeword and the second codeword is variable. ### Claim 5 (depends on 1) The circuit according to claim 1, wherein the first mapping signal and the second mapping signal are generated by mapping each of the two codeword signals on the I-Q plane corresponding to the QPSK scheme. ### Claim 6 (depends on 1) The circuit according to claim 1, wherein the first mapping signal and the second mapping signal are generated by mapping each of the two codeword signals on the I-Q plane corresponding to the 16QAM scheme. ### Claim 7 (depends on 1) The circuit according to claim 1, wherein the first mapping signal is generated by mapping a first one of the two codeword signals on the I-Q plane corresponding to the QPSK scheme and the second mapping signal is generated by mapping a second one of the two codeword signals on the I-Q plane corresponding to the 16QAM scheme. ### Claim 8 (depends on 1) The circuit according to claim 1, wherein the angle included in the equation that is used to arrange the second mapping signal in a case (1) where the second mapping signal is generated based on the QPSK scheme is same as that in a case (2) where the second mapping signal is generated based on the 16QAM scheme. ### Claim 9 A wireless communication apparatus comprising: a receiver, which, in operation, receives a combined signal transmitted from at least an antenna; and circuitry, which, in operation, demodulates the combined signal, wherein the combined signal is generated by generating two codeword signals by encoding data, by generating a first mapping signal and a second mapping signal by mapping each of the two codeword signals on at least one of an in-phase/quadrature phase (I-Q) plane corresponding to a quadrature phase-shift keying (QPSK) scheme and an I-Q plane corresponding to a 16 quadrature amplitude modulation (16QAM) scheme, by arranging the second mapping signal by using an equation having an angle that is not equal to zero, and by combining the first mapping signal and a phase-rotated second mapping signal arranged using the equation to generate a combined signal; and wherein a first codeword of the two codeword signals includes a first cyclic redundancy check (CRC) bits relating to the first codeword, and a second codeword of the two codeword signals includes a second cyclic redundancy check (CRC) bits relating to the second codeword, and wherein the combined signal transmitted from the antenna includes at least one data of the first codeword and one data of the second codeword on each symbol. ### Claim 10 (depends on 9) The wireless communication apparatus according to claim 9, wherein the combined signal is transmitted from two or more antennas. ### Claim 11 (depends on 9) The wireless communication apparatus according to claim 9, wherein each of the first codeword and the second codeword is coded by a Low Density Parity Check (LDPC) code. ### Claim 12 (depends on 9) The wireless communication apparatus according to claim 9, wherein each size of the first codeword and the second codeword is variable. ### Claim 13 A communication method comprising: receiving a combined signal transmitted from at least an antenna; and demodulating the combined signal, wherein the combined signal is generated by generating two codeword signals by encoding data, by generating a first mapping signal and a second mapping signal by mapping each of the two codeword signals on at least one of an in-phase quadrature phase (I-Q) plane corresponding to a quadrature phase-shift keying (QPSK) scheme and an I-Q plane corresponding to a 16 quadrature amplitude modulation (16QAM) scheme, by arranging the second mapping signal by using an equation having an angle that is not equal to zero, and by combining the first mapping signal and the second mapping signal arranged using the equation to generate a combined signal; wherein a first codeword of the two codeword signals includes a first cyclic redundancy check (CRC) bits relating to the first codeword, and a second codeword of the two codeword signals includes a second cyclic redundancy check (CRC) bits relating to the second codeword, and wherein the combined signal transmitted from the antenna includes at least one data of the first codeword and one data of the second codeword on each symbol. ### Claim 14 (depends on 13) The communication method according to claim 13, wherein the combined signal is transmitted from two or more antennas. ### Claim 15 (depends on 13) The communication method according to claim 13, wherein each of the first codeword and the second codeword is coded by a Low Density Parity Check (LDPC) code. ### Claim 16 (depends on 13) The communication method according to claim 13, wherein each size of the first codeword and the second codeword is variable.