# US 10,313,173 B2 · Method and apparatus for performing sequence synchronization in mobile communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,313,173 B2 - Document ID: US10313173B2 - Status: Granted - Kind: B2 - Application number: 15/500,023 - Filed: 2015-07-28 - Published: 2017-09-07 - Granted: 2019-06-04 - Earliest claimed: 2014-07-28 - Assignees: Samsung Electronics Co., Ltd.; Industry-Academic Cooperation Foundation, Yonsei University - Applicants: Samsung Electronics Co., Ltd; Industry-Academic Cooperation Foundation, Yonsei University - Inventors: Daesik Hong; Wonsuk Chung; Chanhong Kim - Web page: https://patentgrep.com/patent/US10313173B2 ## CPC - H04L 27/2654: {Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]} - 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 27/261: {Details of reference signals} - H04L 27/26416: {Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]} - H04L 27/2675: {Pilot or known symbols} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present invention discloses a transmitting and receiving method capable of estimating an accurate time and a frequency synchronization using a sequence in a filter bank multiple transmission system. ## Claims ### Claim 1 A method in a communication system, the method comprising: generating a first pilot sequence including synchronization information; selecting a random block among a plurality of blocks in which the first pilot sequence is included; determining an auxiliary symbol of an auxiliary sequence based on an average power of the selected random block; generating the auxiliary sequence related to a correlation attribute of the first pilot sequence; mapping the first pilot sequence and the auxiliary sequence to a plurality of subcarriers in at least one data symbol; and transmitting data on the at least one data symbol to which the first pilot sequence and the auxiliary sequence are mapped, wherein the selected random block is a block of which a transmission power value of a target pilot sequence among the plurality of blocks is largest. ### Claim 2 (depends on 1) The method as claimed in claim 1, wherein the communication system is a Filter Bank MultiCarrier (FBMC) system. ### Claim 3 (depends on 1) The method as claimed in claim 1, wherein the auxiliary sequence offsets a filter response generated in the first pilot sequence by a plurality of filters. ### Claim 4 (depends on 1) The method as claimed in claim 1, wherein the mapping comprises mapping the first pilot sequence to a specific filter and mapping the auxiliary sequence to a filter different from the specific filter. ### Claim 5 (depends on 1) The method as claimed in claim 1, wherein the mapping comprises mapping a pair of auxiliary sequences to the plurality of subcarriers, based on Offset Quadrature Amplitude Modulation (OQAM). ### Claim 6 (depends on 5) The method as claimed in claim 5, wherein an OQAM mapping method inputs a real number section or an imaginary number section such that a phase difference between an adjacent subcarrier and an adjacent symbol corresponds to π/2. ### Claim 7 (depends on 5) The method as claimed in claim 5, further comprising: determining a number of the auxiliary sequences according to a length of the synchronization information, wherein the mapping comprises mapping the determined auxiliary sequence to the plurality of subcarriers based on the Offset Quadrature Amplitude Modulation (OQAM). ### Claim 8 An apparatus in a communication system, the apparatus comprising: a transceiver configured to transmit and receive a signal; and at least one processor configured to: generate a first pilot sequence including synchronization information, select a random block among a plurality of blocks in which the first pilot sequence is included, determine an auxiliary symbol of an auxiliary sequence based on an average power of the selected random block, generate the auxiliary sequence related to a correlation attribute of the first pilot sequence, map the first pilot sequence and the auxiliary sequence to a plurality of subcarriers in at least one data symbol, and transmit data on the at least one data symbol to which the first pilot sequence and the auxiliary sequence are mapped, wherein the selected random block is a block of which a transmission power value of a target pilot sequence among the plurality of blocks is largest. ### Claim 9 (depends on 8) The apparatus as claimed in claim 8, wherein the auxiliary sequence offsets a filter response generated in the first pilot sequence by a plurality of filters. ### Claim 10 (depends on 8) The apparatus as claimed in claim 8, wherein the at least one processor is further configured to map the first pilot sequence to a specific filter and map the auxiliary sequence to a filter different from the specific filter. ### Claim 11 (depends on 8) The apparatus as claimed in claim 8, wherein the at least one processor is further configured to map a pair of auxiliary sequences to the plurality of subcarriers, based on Offset Quadrature Amplitude Modulation (OQAM).