# US 10,484,228 B2 · Wakeup radio transmit diversity > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,228 B2 - Document ID: US10484228B2 - Status: Granted - Kind: B2 - Application number: 16/272,643 - Filed: 2019-02-11 - Published: 2019-09-05 - Granted: 2019-11-19 - Earliest claimed: 2018-03-05 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Stephen Jay Shellhammer; Bin Tian - Web page: https://patentgrep.com/patent/US10484228B2 ## CPC - H04L 27/2613: {Structure of the reference signals} - H04B 7/0671: {using different delays between antennas} - H04L 27/2082: {for offset or staggered quadrature phase shift keying} - H04L 27/2331: {wherein the received signal is demodulated using one or more delayed versions of itself} - H04L 27/2607: {Cyclic extensions} - H04L 27/261: {Details of reference signals} - H04L 27/2657: {Carrier synchronisation} - H04L 27/2686: {Range of frequencies or delays tested} - H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame} - H04W 52/0229: {where the received signal is a wanted signal} - H04W 52/028: {switching on or off only a part of the equipment circuit blocks} - H04L 27/02: Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation (H04L27/32 takes precedence) - H04L 27/2614: {Peak power aspects} - Y02D 30/70: in wireless communication networks - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract Methods, systems, and devices for wireless communication are described. A transmitting device may transmit a wakeup message to another device. The wakeup message may be transmitted using a transmit diversity scheme in accordance with aspects of the present disclosure. The transmit diversity may, for example, include a cyclic shift diversity scheme, a phase rotation scheme, a symbol generation scheme, or combinations thereof. The transmit diversity may in some cases improve a communication range of the wakeup message or otherwise benefit the wireless communications system. ## Claims ### Claim 1 A first wireless device, comprising: a processor; memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the first wireless device to: identify, for a first portion of a wakeup radio frame, a first set of cyclic delay values corresponding to a plurality of antennas of the first wireless device; identify, for a second portion of the wakeup radio frame, a second set of cyclic delay values corresponding to the plurality of antennas; apply the first set of cyclic delay values to symbols of the first portion of the wakeup radio frame for the plurality of antennas and the second set of cyclic delay values to symbols of the second portion of the wakeup radio frame for the plurality of antennas to generate cyclically-shifted wakeup signals for the plurality of antennas; and transmit the cyclically-shifted wakeup signals to a second wireless device using the plurality of antennas. ### Claim 2 (depends on 1) The first wireless device of claim 1, wherein the instructions are further executable by the processor to cause the first wireless device to: identify the first set of cyclic delay values based at least in part on a first bandwidth for the first portion of the wakeup radio frame; and identify the second set of cyclic delay values based at least in part on a second bandwidth for the second portion of the wakeup radio frame. ### Claim 3 (depends on 2) The first wireless device of claim 2, wherein: the first bandwidth is larger than the second bandwidth; and cyclic delay values of the first set of cyclic delay values are equal to or less than cyclic delay values of the second set of cyclic delay values. ### Claim 4 (depends on 1) The first wireless device of claim 1, wherein the instructions are further executable by the processor to cause the first wireless device to: identify the first set of cyclic delay values based at least in part on a first data rate for the first portion of the wakeup radio frame; and identify the second set of cyclic delay values based at least in part on a second data rate for the second portion of the wakeup radio frame. ### Claim 5 (depends on 4) The first wireless device of claim 4, wherein: the first data rate is greater than the second data rate; and cyclic delay values of the first set of cyclic delay values are equal to or greater than cyclic delay values of the second set of cyclic delay values. ### Claim 6 (depends on 1) The first wireless device of claim 1, wherein: the first portion of the wakeup radio frame comprises at least a synchronization field of the wakeup radio frame; and the second portion of the wakeup radio frame comprises at least a data field of the wakeup radio frame. ### Claim 7 (depends on 1) The first wireless device of claim 1, wherein the wakeup radio frame comprises: a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy signal field (L-SIG), and a binary phase shift keying (BPSK)-Mark field having a first bandwidth; and a synchronization field and a data field having a second bandwidth smaller than the first bandwidth. ### Claim 8 (depends on 7) The first wireless device of claim 7, wherein a cyclic delay value associated with the synchronization field and a cyclic delay value associated with the data field are equal to each other. ### Claim 9 (depends on 7) The first wireless device of claim 7, wherein a cyclic delay value associated with the synchronization field and a cyclic delay value associated with the data field are different from each other. ### Claim 10 A method for wireless communication, comprising: identifying, for a first portion of a wakeup radio frame, a first set of cyclic delay values corresponding to a plurality of antennas of a first wireless device; identifying, for a second portion of the wakeup radio frame, a second set of cyclic delay values corresponding to the plurality of antennas; applying the first set of cyclic delay values to symbols of the first portion of the wakeup radio frame for the plurality of antennas and the second set of cyclic delay values to symbols of the second portion of the wakeup radio frame for the plurality of antennas to generate cyclically-shifted wakeup signals for the plurality of antennas; and transmitting the cyclically-shifted wakeup signals to a second wireless device using the plurality of antennas. ### Claim 11 (depends on 10) The method of claim 10, wherein: identifying the first set of cyclic delay values comprises identifying the first set of cyclic delay values based at least in part on a first bandwidth for the first portion of the wakeup radio frame; and identifying the second set of cyclic delay values comprises identifying the second set of cyclic delay values based at least in part on a second bandwidth for the second portion of the wakeup radio frame. ### Claim 12 (depends on 11) The method of claim 11, wherein: the first bandwidth is larger than the second bandwidth; and cyclic delay values of the first set of cyclic delay values are equal to or less than cyclic delay values of the second set of cyclic delay values. ### Claim 13 (depends on 10) The method of claim 10, wherein: identifying the first set of cyclic delay values comprises identifying the first set of cyclic delay values based at least in part on a first data rate for the first portion of the wakeup radio frame; and identifying the second set of cyclic delay values comprises identifying the second set of cyclic delay values based at least in part on a second data rate for the second portion of the wakeup radio frame. ### Claim 14 (depends on 13) The method of claim 13, wherein: the first data rate is greater than the second data rate; and cyclic delay values of the first set of cyclic delay values are equal to or greater than cyclic delay values of the second set of cyclic delay values. ### Claim 15 (depends on 10) The method of claim 10, wherein: the first portion of the wakeup radio frame comprises at least a synchronization field of the wakeup radio frame; and the second portion of the wakeup radio frame comprises at least a data field of the wakeup radio frame. ### Claim 16 (depends on 10) The method of claim 10, wherein the wakeup radio frame comprises: a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy signal field (L-SIG), and a binary phase shift keying (BPSK)-Mark field having a first bandwidth; and a synchronization field and a data field having a second bandwidth smaller than the first bandwidth. ### Claim 17 (depends on 16) The method of claim 16, wherein a cyclic delay value associated with the synchronization field and a cyclic delay value associated with the data field are equal to each other. ### Claim 18 (depends on 16) The method of claim 16, wherein a cyclic delay value associated with the synchronization field and a cyclic delay value associated with the data field are different from each other. ### Claim 19 A first wireless device, comprising: means for identifying, for a first portion of a wakeup radio frame, a first set of cyclic delay values corresponding to a plurality of antennas of the first wireless device; means for identifying, for a second portion of the wakeup radio frame, a second set of cyclic delay values corresponding to the plurality of antennas; means for applying the first set of cyclic delay values to symbols of the first portion of the wakeup radio frame for the plurality of antennas and the second set of cyclic delay values to symbols of the second portion of the wakeup radio frame for the plurality of antennas to generate cyclically-shifted wakeup signals for the plurality of antennas; and means for transmitting the cyclically-shifted wakeup signals to a second wireless device using the plurality of antennas. ### Claim 20 (depends on 19) The first wireless device of claim 19, further comprising: means for identifying the first set of cyclic delay values based at least in part on a first bandwidth for the first portion of the wakeup radio frame; and means for identifying the second set of cyclic delay values based at least in part on a second bandwidth for the second portion of the wakeup radio frame. ### Claim 21 (depends on 20) The first wireless device of claim 20, wherein: the first bandwidth is larger than the second bandwidth; and cyclic delay values of the first set of cyclic delay values are equal to or less than cyclic delay values of the second set of cyclic delay values. ### Claim 22 (depends on 19) The first wireless device of claim 19, further comprising: means for identifying the first set of cyclic delay values based at least in part on a first data rate for the first portion of the wakeup radio frame; and means for identifying the second set of cyclic delay values based at least in part on a second data rate for the second portion of the wakeup radio frame. ### Claim 23 (depends on 22) The first wireless device of claim 22, wherein: the first data rate is greater than the second data rate; and cyclic delay values of the first set of cyclic delay values are equal to or greater than cyclic delay values of the second set of cyclic delay values. ### Claim 24 (depends on 19) The first wireless device of claim 19, wherein: the first portion of the wakeup radio frame comprises at least a synchronization field of the wakeup radio frame; and the second portion of the wakeup radio frame comprises at least a data field of the wakeup radio frame. ### Claim 25 (depends on 19) The first wireless device of claim 19, wherein the wakeup radio frame comprises: a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy signal field (L-SIG), and a binary phase shift keying (BPSK)-Mark field having a first bandwidth; and a synchronization field and a data field having a second bandwidth smaller than the first bandwidth. ### Claim 26 (depends on 25) The first wireless device of claim 25, wherein a cyclic delay value associated with the synchronization field and a cyclic delay value associated with the data field are equal to each other. ### Claim 27 (depends on 25) The first wireless device of claim 25, wherein a cyclic delay value associated with the synchronization field and a cyclic delay value associated with the data field are different from each other. ### Claim 28 A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to: identify, for a first portion of a wakeup radio frame, a first set of cyclic delay values corresponding to a plurality of antennas of the first wireless device; identify, for a second portion of the wakeup radio frame, a second set of cyclic delay values corresponding to the plurality of antennas; apply the first set of cyclic delay values to symbols of the first portion of the wakeup radio frame for the plurality of antennas and the second set of cyclic delay values to symbols of the second portion of the wakeup radio frame for the plurality of antennas to generate cyclically-shifted wakeup signals for the plurality of antennas; and transmit the cyclically-shifted wakeup signals to a second wireless device using the plurality of antennas.