# US 2019/0173712 A1 · Transmission apparatus, reception apparatus, and communication method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173712 A1 - Document ID: US20190173712A1 - Status: Published application - Kind: A1 - Application number: 16/324,303 - Filed: 2016-08-11 - Published: 2019-06-06 - Earliest claimed: 2016-08-11 - Assignees: Panasonic Intellectual Property Corporation of America - Applicants: Panasonic Intellectual Property Corporation of America - Inventors: Tetsuya YAMAMOTO; Hidetoshi SUZUKI; Lilei WANG; Takashi IWAI - Web page: https://patentgrep.com/patent/US20190173712A1 ## CPC - H04L 27/2634: {Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - 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 27/2614: {Peak power aspects} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 76/27: Transitions between radio resource control [RRC] states - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 27/26362: {Subcarrier weighting equivalent to time domain filtering, e.g. weighting per subcarrier multiplication (arrangements for removing intersymbol interference at the transmitter end H04L25/03343)} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A terminal (transmission apparatus) is disclosed, which is capable of appropriately configuring processing of a Post-IFFT section in accordance with a communication environment in signal waveform generation. In the terminal, an IFFT section performs IFFT processing on a transmission signal; a control section determines a signal waveform configuration for the transmission signal after the IFFT processing in accordance with a communication environment of the terminal, and the Post-IFFT section performs Post-IFFT processing on the transmission signal after the IFFT processing based on the determined signal waveform configuration. ## Claims ### Claim 1 A transmission apparatus comprising: an IFFT section that performs IFFT processing on a transmission signal; a control section that determines a signal waveform configuration for the transmission signal after the IFFT processing in accordance with a communication environment of the transmission apparatus; and a Post-IFFT section that performs Post-IFFT processing on the transmission signal after the IFFT processing based on the determined signal waveform configuration. ### Claim 2 (depends on 1) The transmission apparatus according to claim 1, wherein the control section determines to apply filtering or windowing as the signal waveform configuration when a plurality of transmission apparatuses operate asynchronously. ### Claim 3 (depends on 1) The transmission apparatus according to claim 1, wherein the control section determines not to apply filtering or determines to apply windowing as the signal waveform configuration when low latency communication is required for the transmission apparatus. ### Claim 4 (depends on 1) The transmission apparatus according to claim 1, wherein the control section determines to apply filtering as the signal waveform configuration when an allocation bandwidth allocated for communication of the transmission apparatus is less than a threshold, and determines not to apply filtering or determines to apply windowing as the signal waveform configuration when the allocation bandwidth is equal to or greater than the threshold. ### Claim 5 (depends on 1) The transmission apparatus according to claim 1, wherein the control section determines to apply neither filtering nor windowing as the signal waveform configuration when a guard band is configured in an adjacent band adjacent to an allocation band allocated for communication of the transmission apparatus, and determines to apply filtering or windowing as the signal waveform configuration when no guard band is configured in the adjacent band. ### Claim 6 (depends on 1) The transmission apparatus according to claim 1, wherein a correspondence relationship between the communication environment and the signal waveform configuration is previously defined. ### Claim 7 (depends on 1) The transmission apparatus according to claim 1, wherein the signal waveform configuration is indicated to the transmission apparatus via higher-layer signaling or a control channel. ### Claim 8 A reception apparatus, comprising: a control section that determines a signal waveform configuration for a signal transmitted from a transmission apparatus, in accordance with a communication environment of the transmission apparatus; a Pre-FFT section that performs Pre-FFT processing on the signal based on the determined signal waveform configuration; and an FFT section that performs FFT processing on the signal after the Pre-FFT processing. ### Claim 9 A communication method, comprising: performing IFFT processing on a transmission signal; determining a signal waveform configuration for the transmission signal after the IFFT processing in accordance with a communication environment of a transmission apparatus; and performing Post-IFFT processing on the transmission signal after the IFFT processing based on the determined signal waveform configuration. ### Claim 10 A communication method comprising: determining a signal waveform configuration for a signal transmitted from a transmission apparatus, in accordance with a communication environment of the transmission apparatus; performing Pre-FFT processing on the signal based on the determined signal waveform configuration; and performing FFT processing on the signal after the Pre-FFT processing.