# US 7,613,101 B2 · Receiving processing method and apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,613,101 B2 - Document ID: US7613101B2 - Status: Granted - Kind: B2 - Application number: 11/188,073 - Filed: 2005-07-22 - Published: 2005-11-17 - Granted: 2009-11-03 - Earliest claimed: 2005-04-25 - Assignees: Fujitsu Limited - Inventors: Kenji Suda; Hirovuki Seki - Web page: https://patentgrep.com/patent/US7613101B2 ## CPC - H04L 27/2647: {Arrangements specific to the receiver only (equalisation H04L27/01)} - H04L 25/03006: {Arrangements for removing intersymbol interference} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract The apparatus includes a receiver unit which receives data; and a guard interval combining unit which combines the whole of the guard interval of the data, which is received by the receiver unit, with the valid symbol. This arrangement makes it possible to efficiently improve reception characteristic by effectively using the guard interval, while suppressing the apparatus size and the cost. ## Claims ### Claim 1 A receiving processing method performed at a receiver in a communication system which has a function of transmitting a part of a valid symbol of data, as a guard interval, redundantly in time, said receiving processing method comprising: receiving, in a receiving unit of the receiver, the data; and combining, in a guard interval combining unit of the receiver, the whole of the guard interval of the received data with the valid symbol. ### Claim 2 (depends on 1) The receiving processing method according to claim 1, further comprising evaluating, in a guard interval selective combining unit of the receiver, whether or not the guard interval is to be combined with the valid symbol, based on at least a transmission condition relating to the data. ### Claim 3 (depends on 2) The receiving processing method according to claim 2, wherein the communication system has a function of notifying the receiver end of both or either of modulation scheme information, which relates to a modulation scheme of the data, and encoding rate information, which relates to an encoding rate of the data, as the transmission condition, and wherein said method further comprises: evaluating, in a combination evaluating unit of the receiver, whether or not the guard interval is to be combined with the valid symbol based on the notified transmission condition; and combining, in a guard interval combination processing unit of the receiver, if the evaluation result is positive, the guard interval with the valid symbol. ### Claim 4 (depends on 3) The receiving processing method according to claim 3, further comprising: measuring, in a delay profile measuring unit of the receiver, a delay profile of the received data; and adding, in said combination evaluating unit of the receiver, the measurement result to evaluation conditions for evaluating whether or not the guard interval is combined with the valid symbol, for performing the above-mentioned evaluation. ### Claim 5 (depends on 3) The receiving processing method according to claim 3, wherein if the evaluation result is that the guard interval is not to be combined with the valid symbol, the guard interval is removed in said guard interval combination processing unit of the receiver. ### Claim 6 (depends on 1) The receiving processing method according to claim 1, wherein a simple addition method is applied, in a simple addition unit of the receiver, when the guard interval is combined with the valid symbol. ### Claim 7 (depends on 1) The receiving processing method according to claim 1, wherein an averaging method is applied, in an averaging unit of the receiver, when the guard interval is combined with the valid symbol. ### Claim 8 A receiving apparatus in a communication system which has a function of transmitting a part of a valid symbol of data, as a guard interval, redundantly in time, said receiving apparatus comprising: a receiving unit which receives the data; and a guard interval combining unit which combines the whole of the guard interval of the data, which is received by said receiving unit, with the valid symbol. ### Claim 9 (depends on 8) The receiving apparatus according to claim 8, wherein said guard interval combining unit is configured as a guard interval selective combining unit which evaluates whether or not the guard interval is to be combined with the valid symbol, based on at least a transmission condition relating to the data. ### Claim 10 (depends on 9) The receiving apparatus according to claim 9, wherein the communication system has a function of notifying the receiver end of both or either of modulation scheme information, which relates to a modulation scheme of the data, and encoding rate information, which relates to an encoding rate of the data, as the transmission condition, and wherein said guard interval selective combining unit includes: a combination evaluating unit which evaluates whether or not the guard interval is to be combined with the valid symbol based on the notified transmission condition; and a guard interval combination processing unit which combines, if the evaluation result is positive, the guard interval with the valid symbol. ### Claim 11 (depends on 10) The receiving apparatus according to claim 10, further comprising a delay profile measuring unit which measures a delay profile of the received data, wherein said combination evaluating unit adds the measurement result to evaluation conditions for evaluating whether or not the guard interval is combined with the valid symbol, for performing the above-mentioned evaluation. ### Claim 12 (depends on 10) The receiving apparatus according to claim 10, wherein said guard interval combination processing unit is configured as a simple addition unit which combines the guard interval with the valid symbol by a simple addition method. ### Claim 13 (depends on 10) The receiving apparatus according to claim 10, wherein said guard interval combination processing unit is configured as an averaging unit which combines the guard interval with the valid symbol by an averaging method. ### Claim 14 (depends on 10) The receiving apparatus according to claim 10, wherein said guard interval combination processing unit removes, if the evaluation result is that the guard interval is not to be combined with the valid symbol, the guard interval.