# US 2021/0344535 A1 · Peak-to-average power ratio (papr) reduction techniques > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0344535 A1 - Document ID: US20210344535A1 - Status: Published application - Kind: A1 - Application number: 17/185,644 - Filed: 2021-02-25 - Published: 2021-11-04 - Earliest claimed: 2020-05-01 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Gokul Sridharan; Saeid Sahraei; June Namgoong; Peter Gaal; Krishna Kiran Mukkavilli; Tingfang Ji; Wei Yang - Web page: https://patentgrep.com/patent/US20210344535A1 ## CPC - H04L 25/03834: {using pulse shaping} - H04L 27/262: {Reduction thereof by selection of pilot symbols} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 27/2614: {Peak power aspects} - H04L 27/2618: {Reduction thereof using auxiliary subcarriers} - H04L 27/26265: {Arrangements for sidelobes suppression specially adapted to multicarrier systems, e.g. spectral precoding} - 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)} - H04W 72/04: Wireless resource allocation - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 27/2623: {Reduction thereof by clipping} - H04L 27/2636: {with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]} - 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 Techniques for peak-to-average power ratio (PAPR) reduction are described. Wireless devices may provide signaling with respect to one or more PAPR shaping resources. For example, a wireless device may provide signaling of PAPR shaping capability information. PAPR shaping capability information may include information regarding one or more PAPR shaping resources the wireless device has a capability to implement. Additionally or alternatively, a wireless device may provide signaling of PAPR shaping information. PAPR shaping information may include information regarding shaping the signal by a wireless device prior to transmission in a communication link by implementing one or more PAPR shaping resources. Other aspects and features are also claimed and described. ## Claims ### Claim 1 A method of wireless communication, comprising: providing, by a first wireless device, resource allocation to a second wireless device; and signaling, by the first wireless device, peak to average power ratio (PAPR) shaping information to the second wireless device for implementing PAPR shaping with respect to a signal transmitted using the resource allocation, wherein the PAPR shaping information includes information regarding shaping the signal by the second wireless device prior to transmission in a communication link. ### Claim 2 (depends on 1) The method of claim 1, wherein the PAPR shaping information includes information regarding one or more PAPR shaping resources for PAPR shaping and PAPR shaping implementation information. ### Claim 3 (depends on 1) The method of claim 1, wherein the PAPR shaping information includes information regarding expanded bandwidth available for shaping the signal prior to transmission in the communication link. ### Claim 4 (depends on 3) The method of claim 3, wherein the PAPR shaping information comprises information regarding a bandwidth extension table from which the expanded bandwidth is determined. ### Claim 5 (depends on 3) The method of claim 3, wherein the PAPR shaping information comprises information regarding a length of cyclic affix (CA) configured for PAPR shaping added by the second wireless device when processing the signal for transmission in the communication link, wherein the length of the CA corresponds to the expanded bandwidth. ### Claim 6 (depends on 5) The method of claim 5, wherein the information regarding the length of the CA comprises a number frequency resources of the expanded bandwidth, a size of the expanded bandwidth relative to the resource allocation, or a combination thereof. ### Claim 7 (depends on 3) The method of claim 3, wherein signaling the PAPR shaping information comprises: using radio resource control (RRC) or media access control (MAC) control element (CE) signaling to provide information regarding the expanded bandwidth, downlink control information (DCI) signaling to dynamically provide information regarding the expanded bandwidth, or a combination thereof. ### Claim 8 (depends on 1) The method of claim 1, wherein the PAPR shaping information includes information regarding pulse-shaping filtering for shaping the signal prior to transmission in the communication link. ### Claim 9 (depends on 8) The method of claim 8, wherein signaling the PAPR shaping information comprises: using radio resource control (RRC) or media access control (MAC) control element (CE) signaling to provide information regarding the pulse-shaping filtering, downlink control information (DCI) signaling to dynamically provide information regarding the pulse-shaping filtering, or a combination thereof. ### Claim 10 (depends on 8) The method of claim 8, further comprising: signaling demodulation reference signal (DMRS) information for a DMRS transmitted by the second wireless device in association with the transmission in the communication link, wherein the DMRS information includes information regarding whether a pulse-shaping filter is to be used by the second wireless device with respect to the DMRS transmitted by the second wireless device. ### Claim 11 An apparatus configured for wireless communication, the apparatus comprising: at least one processor; and a memory coupled to the at least one processor, wherein the at least one processor is configured: to provide, by a first wireless device, resource allocation to a second wireless device; and to signal, by the first wireless device, peak to average power ratio (PAPR) shaping information to the second wireless device for implementing PAPR shaping with respect to a signal transmitted using the resource allocation, wherein the PAPR shaping information includes information regarding shaping the signal by the second wireless device prior to transmission in a communication link. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the PAPR shaping information includes information regarding one or more PAPR shaping resources for PAPR shaping and PAPR shaping implementation information. ### Claim 13 (depends on 11) The apparatus of claim 11, wherein the PAPR shaping information includes information regarding expanded bandwidth available for shaping the signal prior to transmission in the communication link. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the PAPR shaping information comprises information regarding a bandwidth extension table from which the expanded bandwidth is determined. ### Claim 15 (depends on 13) The apparatus of claim 13, wherein the PAPR shaping information comprises information regarding a length of cyclic affix (CA) configured for PAPR shaping added by the second wireless device when processing the signal for transmission in the communication link, wherein the length of the CA corresponds to the expanded bandwidth. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the information regarding the length of the CA comprises a number frequency resources of the expanded bandwidth, a size of the expanded bandwidth relative to the resource allocation, or a combination thereof. ### Claim 17 (depends on 13) The apparatus of claim 13, wherein the at least one processor configured to signal the PAPR shaping information is configured: to use radio resource control (RRC) or media access control (MAC) control element (CE) signaling to provide information regarding the expanded bandwidth, downlink control information (DCI) signaling to dynamically provide information regarding the expanded bandwidth, or a combination thereof. ### Claim 18 (depends on 11) The apparatus of claim 11, wherein the PAPR shaping information includes information regarding pulse-shaping filtering for shaping the signal prior to transmission in the communication link. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein the at least one processor configured to signal the PAPR shaping information is configured: to use radio resource control (RRC) or media access control (MAC) control element (CE) signaling to provide information regarding the pulse-shaping filtering, downlink control information (DCI) signaling to dynamically provide information regarding the pulse-shaping filtering, or a combination thereof. ### Claim 20 (depends on 18) The apparatus of claim 18, wherein the one or more processor is further configured: to signal demodulation reference signal (DMRS) information for a DMRS transmitted by the second wireless device in association with the transmission in the communication link, wherein the DMRS information includes information regarding whether a pulse-shaping filter is to be used by the second wireless device with respect to the DMRS transmitted by the second wireless device. ### Claim 21 A method of wireless communication, comprising: signaling, by a first wireless device to a second wireless device in communication with the first wireless device, peak to average power ratio (PAPR) shaping capability information regarding one or more PAPR shaping resources the first wireless device has a capability to implement; and implementing, by the first wireless device, at least one PAPR shaping resource of the one or more PAPR shaping resources prior to transmission of a signal in a communication link to the second wireless device. ### Claim 22 (depends on 22) The method of claim 22, wherein the one or more PAPR shaping resources the first wireless device has a capability to implement includes expanded bandwidth available for shaping the signal prior to transmission in the uplink. ### Claim 23 (depends on 21) The method of claim 21, wherein the one or more PAPR shaping resources the first wireless device has a capability to implement includes pulse-shaping filtering for shaping the signal prior to transmission in the uplink. ### Claim 24 (depends on 21) The method of claim 21, further comprising: receiving, by the first wireless device from the second wireless device, PAPR shaping information, wherein the PAPR shaping information is responsive to the PAPR shaping capability information signaled by the first wireless device, and wherein the implementing at least one PAPR shaping resource is in accordance with the PAPR shaping information received from the second wireless device. ### Claim 25 (depends on 24) The method of claim 24, further comprising: receiving, by the first wireless device from the second wireless device, demodulation reference signal (DMRS) information, wherein DMRS information is responsive to the PAPR shaping capability information signaled by the first wireless device, and wherein the DMRS information includes information regarding whether a pulse-shaping filter is to be used by the first wireless device with respect to the DMRS transmitted by the first wireless device. ### Claim 26 An apparatus configured for wireless communication, the apparatus comprising: at least one processor; and a memory coupled to the at least one processor, wherein the at least one processor is configured: to signal, by a first wireless device to a second wireless device in communication with the first wireless device, peak to average power ratio (PAPR) shaping capability information regarding one or more PAPR shaping resources the first wireless device has a capability to implement; to implement, by the first wireless device, at least one PAPR shaping resource of the one or more PAPR shaping resources prior to transmission of a signal in a communication link to the second wireless device. ### Claim 27 (depends on 26) The apparatus of claim 26, wherein the one or more PAPR shaping resources the first wireless device has a capability to implement includes expanded bandwidth available for shaping the signal prior to transmission in the uplink. ### Claim 28 (depends on 26) The apparatus of claim 26, wherein the one or more PAPR shaping resources the first wireless device has a capability to implement includes pulse-shaping filtering for shaping the signal prior to transmission in the uplink. ### Claim 29 (depends on 26) The apparatus of claim 26, wherein the at least one processor is further configured: to receive, by the first wireless device from the second wireless device, PAPR shaping information, wherein the PAPR shaping information is responsive to the PAPR shaping capability information signaled by the first wireless device, and wherein the implementing at least one PAPR shaping resource is in accordance with the PAPR shaping information received from the second wireless device. ### Claim 30 (depends on 29) The apparatus of claim 29, wherein the at least one processor is further configured: to receive, by the first wireless device from the second wireless device, demodulation reference signal (DMRS) information, wherein DMRS information is responsive to the PAPR shaping capability information signaled by the first wireless device, and wherein the DMRS information includes information regarding whether a pulse-shaping filter is to be used by the first wireless device with respect to the DMRS transmitted by the first wireless device.