# US 10,374,859 B2 · Apparatus and method for pre-processing for filter bank multi carrier scheme in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,374,859 B2 - Document ID: US10374859B2 - Status: Granted - Kind: B2 - Application number: 15/344,454 - Filed: 2016-11-04 - Published: 2017-05-11 - Granted: 2019-08-06 - Earliest claimed: 2015-11-05 - Assignees: Samsung Electronics Co., Ltd.; Industry-Academic Cooperation Foundation, Yonsei University - Applicants: Samsung Electronics Co., Ltd; Industry-Academic Cooperation Foundation, Yonsei University - Inventors: Kyeongyeon Kim; Dongkyu Sim; Taehyun Lee; Chungyong Lee - Web page: https://patentgrep.com/patent/US10374859B2 ## CPC - H04L 27/2646: {using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length} - H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting - H04B 17/336: Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] - H04B 17/354: Adjacent channel leakage power - H04L 25/03821: {Inter-carrier interference cancellation [ICI]} - H04L 27/26416: {Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]} - H04L 27/2654: {Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]} - H04B 7/0417: Feedback systems - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION ## Abstract The present disclosure relates to a 5G or pre-5G communication system for providing a higher data rate after a 4G communication system such as LTE. Particularly, the present disclosure relates to pre-processing for Filter Bank Multi-Carrier (FBMC) in a wireless communication system, and a method of a communication node includes the operations of receiving a signal from a counterpart node, determining a pre-processing scheme according to a channel and a frequency confinement characteristic of a filter based on the received signal, and performing pre-processing for a subcarrier set corresponding to the filter in accordance with the determined pre-processing scheme. ## Claims ### Claim 1 A method for operating in a communication node, the method comprising: determining an inter-carrier interference (ICI) on a subcarrier set based on a frequency confinement characteristic of at least one filter corresponding to the subcarrier set and a channel for the subcarrier set; determining a precoding scheme based on the ICI on the subcarrier set; and transmitting, to a counterpart node, a feedback signal comprising information indicating the precoding scheme, wherein the precoding scheme is determined to be a first scheme for using each subcarrier symbol in the subcarrier set to obtain a precoding result for the each subcarrier symbol in response to the ICI being less than a threshold value, and wherein the precoding scheme is determined to be a second scheme for using each subcarrier symbol in the subcarrier set and at least one additional subcarrier symbol to obtain a precoding result for the each subcarrier symbol in response to the ICI being greater than the threshold value. ### Claim 2 (depends on 1) The method of claim 1, wherein the determining of the precoding scheme comprises: if a maximum value of a sum of ICI components of the ICI is less than or is equal to the threshold value, determining the precoding scheme as a sub-band pre-processing scheme for precoding a single subcarrier; and if the maximum value of the sum of the ICI components of the ICI is greater than the threshold value, determining the precoding scheme as a wide-band pre-processing scheme for precoding a plurality of subcarriers, wherein the threshold value is set such that the maximum value of the sum of the ICI components guarantees an average value of a minimum signal to interference ratio (SIR) for all subcarriers. ### Claim 3 (depends on 2) The method of claim 2, wherein a number of the plurality of subcarriers corresponds to a subcarrier range, and wherein at least one of the plurality of subcarriers is adjacent to the subcarrier set. ### Claim 4 (depends on 3) The method of claim 3, wherein the determining of the precoding scheme comprises: determining a value of dividing the sum of the ICI components by a maximum value of a ICI component, as a subcarrier region determination metric; and determining the subcarrier range based on the subcarrier region determination metric. ### Claim 5 (depends on 3) The method of claim 3, wherein the feedback signal further comprises criterion information necessary for designing a pre-processor corresponding to the determined precoding scheme, codebook information, or precoding matrix index information. ### Claim 6 (depends on 3) The method of claim 3, further comprising setting a pre-processor of the communication node based on at least one of information regarding the subcarrier range, or criterion information necessary for designing the pre-processor corresponding to the determined precoding scheme. ### Claim 7 (depends on 6) The method of claim 6, wherein the setting of the pre-processor of the communication node comprises setting a precoder maximizing a signal to leakage and noise ratio (SLNR) based on at least one of information regarding the subcarrier range, and criterion information necessary for designing the pre-processor corresponding to the determined precoding scheme. ### Claim 8 (depends on 3) The method of claim 3, further comprising setting a receiver based on a precoding matrix comprising the subcarrier range and an effective channel response, wherein the effective channel response is determined based on the frequency confinement characteristic of the at least one filter and the channel for the subcarrier set. ### Claim 9 (depends on 3) The method of claim 3, further comprising receiving a signal comprising at least one of information regarding the subcarrier range, criterion information necessary for designing a pre-processor corresponding to the determined precoding scheme, codebook information, or precoding matrix index information. ### Claim 10 (depends on 1) The method of claim 1, wherein the communication node is associated with a communication system which is based on a filter bank multi carrier (FBMC) scheme. ### Claim 11 An apparatus of a communication node, the apparatus comprising: at least one processor configured to: determine an inter-carrier interference (ICI) on a subcarrier set based on a frequency confinement characteristic of at least one filter corresponding to the subcarrier set and a channel for the subcarrier set, and determine a precoding scheme based on the ICI on the subcarrier set; and at least one transceiver configured to transmit, to a counterpart node, a feedback signal comprising information indicating the precoding scheme, wherein the precoding scheme is determined to be a first scheme for using each subcarrier symbol in the subcarrier set to obtain a precoding result for the each subcarrier symbol in response to the ICI being less than a threshold value, and wherein the precoding scheme is determined to be a second scheme for using each subcarrier symbol in the subcarrier set and at least one additional subcarrier symbol to obtain a precoding result for the each subcarrier symbol in response to the ICI being greater than the threshold value. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the at least one processor is further configured to: if a maximum value of a sum of ICI components of the ICI is less than or is equal to a threshold value, determine the precoding scheme as a sub-band pre-processing scheme for precoding a single subcarrier, and if the maximum value of the sum of the ICI components of the ICI is greater than the threshold value, determine the precoding scheme as a wide-band pre-processing scheme for precoding a plurality of subcarriers, wherein the threshold value is set such that the maximum value of the sum of the ICI components guarantees an average value of a minimum signal to interference ratio (SIR) for all subcarriers. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein a number of the plurality of subcarriers corresponds to a subcarrier range, and wherein at least one of the plurality of subcarriers is adjacent to the subcarrier set. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the at least one processor is further configured to: determine a value of dividing the sum of the ICI components by a maximum value of a ICI component, as a subcarrier region determination metric, and determine the subcarrier range based on the subcarrier region determination metric. ### Claim 15 (depends on 13) The apparatus of claim 13, wherein the feedback signal further comprises criterion information necessary for designing a pre-processor corresponding to the determined precoding scheme, codebook information, or precoding matrix index information. ### Claim 16 (depends on 13) The apparatus of claim 13, wherein the at least one processor is further configured to set a pre-processor of the communication node based on at least one of information regarding the subcarrier range, or criterion information necessary for designing the pre-processor corresponding to the determined precoding scheme. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the at least one processor is further configured to set a precoder maximizing a signal to leakage and noise ratio (SLNR) based on at least one of information regarding the subcarrier range, and criterion information necessary for designing the pre-processor corresponding to the determined precoding scheme. ### Claim 18 (depends on 13) The apparatus of claim 13, wherein: the at least one processor is further configured to set a receiver based on a precoding matrix comprising the subcarrier range and an effective channel response, and the effective channel response is determined based on the frequency confinement characteristic of the at least one filter and the channel for the subcarrier set. ### Claim 19 (depends on 13) The apparatus of claim 13, wherein the at least one transceiver is further configured to receive a signal comprising at least one of information regarding the subcarrier range, criterion information necessary for designing a pre-processor corresponding to the determined precoding scheme, codebook information, or precoding matrix index information. ### Claim 20 (depends on 11) The apparatus of claim 11, wherein the communication node is associated with a communication system which is based on a filter bank multi carrier (FBMC) scheme.