# US 11,909,682 B2 · Single carrier waveforms for phase tracking reference signals > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,682 B2 - Document ID: US11909682B2 - Status: Granted - Kind: B2 - Application number: 17/446,665 - Filed: 2021-09-01 - Published: 2022-03-10 - Granted: 2024-02-20 - Earliest claimed: 2020-09-08 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Jacob Pick; Amit Bar-Or Tillinger; Shay Landis; Yehonatan Dallal; Assaf Touboul - Web page: https://patentgrep.com/patent/US11909682B2 ## CPC - 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 27/2613: {Structure of the reference signals} - 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 5/0094: {Indication of how sub-channels of the path are allocated} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, a phase tracking reference signal. The phase tracking reference signal is transmitted using a single carrier waveform and encoded within a time domain. Accordingly, the UE may decode, from the base station, a message, based at least in part on the phase tracking reference signal. Numerous other aspects are provided. ## Claims ### Claim 1 A method of wireless communication performed by a user equipment (UE), comprising: receiving, from a base station, a phase tracking reference signal, wherein the phase tracking reference signal was transmitted using a single carrier waveform and encoded within a time domain; and decoding a message, received from the base station, based at least in part on the phase tracking reference signal, wherein the phase tracking reference signal is based at least in part on a sequence with zero mean and a low cross-correlation property. ### Claim 2 (depends on 1) The method of claim 1, wherein the sequence is initiated based at least in part on an index of a slot that includes the phase tracking reference signal and an indicator of an antenna port that the base station used to transmit the phase tracking reference signal. ### Claim 3 (depends on 1) The method of claim 1, wherein the phase tracking reference signal is based at least in part on an index of a symbol that includes the phase tracking reference signal. ### Claim 4 (depends on 3) The method of claim 3, wherein the phase tracking reference signal is based at least in part on an indicator of a layer including the symbol. ### Claim 5 (depends on 1) The method of claim 1, wherein decoding based at least in part on the phase tracking reference signal includes estimating phase noise based at least in part on the phase tracking reference signal. ### Claim 6 (depends on 1) The method of claim 1, further comprising: receiving, from the base station, an indication of a period associated with the phase tracking reference signal, wherein the phase tracking reference signal is received based at least in part on the period. ### Claim 7 (depends on 1) The method of claim 1, wherein the phase tracking reference signal is based at least in part on an indicator of an antenna port and an index of a symbol that includes the phase tracking reference signal. ### Claim 8 A method of wireless communication performed by a base station, comprising: determining a phase tracking reference signal for a single carrier and within a time domain; and transmitting, on the single carrier and to a user equipment (UE), the phase tracking reference signal, wherein the phase tracking reference signal is based at least in part on a sequence with zero mean and a low cross-correlation property. ### Claim 9 (depends on 8) The method of claim 8, wherein the sequence is initiated based at least in part on an index of a slot that includes the phase tracking reference signal and an indicator of an antenna port that the base station used to transmit the phase tracking reference signal. ### Claim 10 (depends on 8) The method of claim 8, wherein the phase tracking reference signal is based at least in part on an index of a symbol that includes the phase tracking reference signal. ### Claim 11 (depends on 10) The method of claim 10, wherein the phase tracking reference signal is based at least in part on an indicator of a layer including the symbol. ### Claim 12 (depends on 8) The method of claim 8, the phase tracking reference signal is configured to allow the UE to estimate phase noise based at least in part on the phase tracking reference signal. ### Claim 13 (depends on 8) The method of claim 8, further comprising: transmitting, to the UE, an indication of a period associated with the phase tracking reference signal, wherein the phase tracking reference signal is transmitted based at least in part on the period. ### Claim 14 (depends on 8) The method of claim 8, wherein the phase tracking reference signal is based at least in part on an indicator of an antenna port and an index of a symbol that includes the phase tracking reference signal. ### Claim 15 An apparatus for wireless communication at a user equipment (UE), comprising memory, and one or more processors coupled to the memory and configured to: receive, from a base station, a phase tracking reference signal, wherein the phase tracking reference signal was transmitted using a single carrier waveform and encoded within a time domain; and decode a message, received from the base station, based at least in part on the phase tracking reference signal, wherein the phase tracking reference signal is based at least in part on a sequence with zero mean and a low cross-correlation property. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the sequence is initiated based at least in part on an index of a slot that includes the phase tracking reference signal and an indicator of an antenna port that the base station used to transmit the phase tracking reference signal. ### Claim 17 (depends on 15) The apparatus of claim 15, wherein the phase tracking reference signal is based at least in part on an index of a symbol that includes the phase tracking reference signal. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein the phase tracking reference signal is based at least in part on an indicator of a layer including the symbol. ### Claim 19 (depends on 15) The apparatus of claim 15, wherein the one or more processors, to decode based at least in part on the phase tracking reference signal, are configured to estimate phase noise based at least in part on the phase tracking reference signal. ### Claim 20 (depends on 15) The apparatus of claim 15, wherein the one or more processors are further configured to: receive, from the base station, an indication of a period associated with the phase tracking reference signal, wherein the phase tracking reference signal is received based at least in part on the period. ### Claim 21 (depends on 15) The apparatus of claim 15, wherein the phase tracking reference signal is based at least in part on an indicator of an antenna port and an index of a symbol that includes the phase tracking reference signal. ### Claim 22 An apparatus for wireless communication at a base station, comprising memory, and one or more processors coupled to the memory and configured to: determine a phase tracking reference signal for a single carrier and within a time domain; and transmit, on the single carrier and to a user equipment (UE), the phase tracking reference signal, wherein the phase tracking reference signal is based at least in part on a sequence with zero mean and a low cross-correlation property. ### Claim 23 (depends on 22) The apparatus of claim 22, wherein the sequence is initiated based at least in part on an index of a slot that includes the phase tracking reference signal and an indicator of an antenna port that the base station used to transmit the phase tracking reference signal. ### Claim 24 (depends on 22) The apparatus of claim 22, wherein the phase tracking reference signal is based at least in part on an index of a symbol that includes the phase tracking reference signal. ### Claim 25 (depends on 24) The apparatus of claim 24, wherein the phase tracking reference signal is based at least in part on an indicator of a layer including the symbol. ### Claim 26 (depends on 22) The apparatus of claim 22, the phase tracking reference signal is configured to allow the UE to estimate phase noise based at least in part on the phase tracking reference signal. ### Claim 27 (depends on 22) The apparatus of claim 22, wherein the one or more processors are further configured to: transmit, to the UE, an indication of a period associated with the phase tracking reference signal, wherein the phase tracking reference signal is transmitted based at least in part on the period. ### Claim 28 (depends on 22) The apparatus of claim 22, wherein the phase tracking reference signal is based at least in part on an indicator of an antenna port and an index of a symbol that includes the phase tracking reference signal.