# US 10,484,221 B2 · Method and apparatus for generating/transmitting a frame for wireless communication, and synchronization estimation method for wireless communication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,221 B2 - Document ID: US10484221B2 - Status: Granted - Kind: B2 - Application number: 15/871,760 - Filed: 2018-01-15 - Published: 2018-06-07 - Granted: 2019-11-19 - Earliest claimed: 2009-08-25 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Kapseok Chang; Wooyong Lee; Hyun-Kyu Chung - Web page: https://patentgrep.com/patent/US10484221B2 ## CPC - H04L 27/261: {Details of reference signals} - H04L 27/2613: {Structure of the reference signals} - H04L 27/2692: {with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver} - H04W 56/0085: {detecting a given structure in the signal} - H04W 72/04: Wireless resource allocation - H04W 84/12: WLAN [Wireless Local Area Networks] - 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 Disclosed is a technique related to a method and apparatus for generating a preamble and a data frame for wireless communication, and to a synchronization estimation method using the preamble. According to the technique, a method for generating a frame for wireless communication is disclosed, wherein the method comprises: a step of generating a modified sequence using a first base sequence for synchronization estimation; and a step of allocating the first base sequence and the modified sequence to the frequency domain of a first timeslot to generate a preamble. The modified sequence includes a complex conjugated sequence of the first base sequence or a sequence having a code different from that of the first base sequence. ## Claims ### Claim 1 A method of generating a frame for communication, the method comprising: generating, by a processor, a modified sequence using a base sequence, the modified sequence corresponding to a complex conjugate of the base sequence, each of the base sequence and the modified sequence including a plurality of elements; allocating, by the processor, the plurality of elements of the base sequence and the plurality of elements of the modified sequence into a first time period of the frame; and allocating, by the processor, information for automatic gain control or signal detection into a second time period of the frame, wherein the plurality of elements of the base sequence and the plurality of elements of the modified sequence are allocated into a frequency domain in the first time period, wherein the second time period is located before the first time period in the frame, and wherein the base sequence and the modified sequence include a plurality of symbols mapping complex coordinates. ### Claim 2 (depends on 1) The method of claim 1, wherein the base sequence is complex form, and the modified sequence is complex conjugate of the base sequence. ### Claim 3 (depends on 1) The method of claim 1, wherein the base sequence and the modified sequence are non-overlapped with each other in the frequency domain. ### Claim 4 (depends on 1) The method of claim 1, wherein the base sequence is allocated to a half portion of the frequency domain, and the modified sequence is allocated to a remaining half portion of the frequency domain. ### Claim 5 (depends on 1) The method of claim 1, wherein the modified sequence is allocated to an upper portion of the frequency domain than a portion allocated to the base sequence in the frequency domain in a same time interval. ### Claim 6 A method of generating a frame for communication, the method comprising: generating, by a processor, a modified sequence using a base sequence, the modified sequence corresponding to a complex conjugate of the base sequence; allocating, by the processor, a plurality of elements of the base sequence and a plurality of elements of the modified sequence to a first time period of the frame; and allocating, by the processor, information for automatic gain control or signal detection into a second time period of the frame, wherein the plurality of elements of the base sequence and the plurality of elements of the modified sequence are allocated into a frequency domain of the first time period, wherein the second time period is located before the first time period in the frame, and wherein the base sequence and the modified sequence include a plurality of symbols mapping complex coordinates. ### Claim 7 (depends on 6) The method of claim 6, wherein the base sequence and the modified sequence are non-overlapped with each other in the frequency domain. ### Claim 8 (depends on 6) The method of claim 6, wherein the base sequence is allocated to a half portion of the frequency domain, and the modified sequence is allocated to a remaining half portion of the frequency domain. ### Claim 9 (depends on 6) The method of claim 6, wherein the modified sequence is allocated to an upper portion of the frequency domain than a portion allocated to the base sequence in the frequency domain in a same time interval. ### Claim 10 (depends on 6) The method of claim 6, wherein the base sequence is complex form, and the modified sequence is complex conjugate of the base sequence. ### Claim 11 A method of generating a frame for communication, the method comprising: generating, by a processor, a modified sequence using a base sequence, the modified sequence corresponding to a complex conjugate of the base sequence, each of the base sequence and the modified sequence including a plurality of elements; allocating, by the processor, the plurality of elements of the base sequence and the plurality of elements of the modified sequence into a first time period of the frame; and allocating, by the processor, information for automatic gain control or signal detection into a second time period of the frame, wherein the plurality of elements of the base sequence and the plurality of elements of the modified sequence are allocated into a frequency domain of the first time period, wherein the second time period is located before the first time period in the frame, and wherein the base sequence and the modified sequence include a plurality of symbols mapping complex coordinates. ### Claim 12 (depends on 11) The method of claim 11, wherein the base sequence is allocated to a half portion of a frequency domain, and the modified sequence is allocated to a remaining half portion of the frequency domain. ### Claim 13 (depends on 11) The method of claim 11, wherein the modified sequence is allocated to an upper portion of the frequency domain than a portion allocated to the base sequence in the frequency domain in a same time interval. ### Claim 14 (depends on 11) The method of claim 11, wherein the base sequence is complex form, and the modified sequence is complex conjugate of the base sequence.