# US 2014/0369450 A1 · Interference mitigation in a communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0369450 A1 - Document ID: US20140369450A1 - Status: Published application - Kind: A1 - Application number: 14/471,202 - Filed: 2014-08-28 - Published: 2014-12-18 - Earliest claimed: 2012-02-29 - Assignees: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. - Applicants: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. - Inventors: Martin LEYH; Aharon VARGAS BARROSO; Michael SCHLICT; Frank MAYER - Web page: https://patentgrep.com/patent/US20140369450A1 ## CPC - H04B 1/109: {by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input} - H04B 1/1027: {assessing signal quality or detecting noise/interference for the received signal} - H04L 25/03178: {Arrangements involving sequence estimation techniques} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A receiver has an input for an incoming signal, the incoming signal possibly having a wanted signal and one or more interference signals. The receiver further has a signal source for providing a predetermined signal that is substantially identical to at least a portion of at least one interference signal of the one or more interference signals. The receiver also has a signal analyzer for analyzing the incoming signal regarding at least one known signal component of at least one of the one or more interference signals to obtain at least one interference signal parameter. A cancellation signal generator generates a cancellation signal on the basis of the at least one interference signal parameter. The receiver further has an interference canceller for at least partially cancelling the at least one interference signal by applying the cancellation signal to the incoming signal. A corresponding transmitter and a method for interference cancellation are also disclosed. ## Claims ### Claim 1 A receiver, comprising an input for an incoming signal, the incoming signal possibly comprising a wanted signal and one or more interference signals, wherein the one or more interference signals comprise one or more predetermined signal at least occasionally; an interference parameter provider for providing interference signal parameters regarding at least one known signal component of at least one of the one or more interference signals; a cancellation signal generator for generating a cancellation signal on the basis of the interference signal parameters; and an interference canceller for at least partially cancelling the one or more interference signals by applying the cancellation signal to the incoming signal; wherein the interference canceller is configured to pause during time intervals in which the one or more interference signal comprises data that is not a-priori known at the receiver. ### Claim 2 (depends on 1) The receiver according to claim 1, wherein the interference parameter provider comprises: a signal source for providing a predetermined signal that is substantially identical to the at least one known signal component; and an interference signal correlator for performing a correlation of the incoming signal with the predetermined signal and for determining interference signal parameters of the at least one interference signal based on the correlation. ### Claim 3 (depends on 2) The receiver according to claim 2, wherein the cancellation signal generator is configured for receiving the predetermined signal to be used for generating the cancellation signal. ### Claim 4 (depends on 2) The receiver according to claim 2, further comprising a primary correlator for performing a correlation of the incoming signal with pilot signals of the wanted signal and for determining wanted signal parameters of the wanted signal based on the correlation, wherein the wanted signal parameters are provided to the interference correlator to be used for the correlation of the incoming signal with the predetermined signal. ### Claim 5 (depends on 2) The receiver according to claim 2, wherein the cancellation signal generator comprises a weighting unit for determining and applying weighting parameters for the cancellation signal. ### Claim 6 (depends on 2) The receiver according to claim 2, wherein the known signal component of the at least one interference signal corresponds to predetermined dummy data inserted into the interference signal by an associated interfering transmitter when the interfering transmitter comprises no payload data to transmit. ### Claim 7 (depends on 2) The receiver according to claim 2, wherein the signal source is configured for providing the predetermined signal on the basis of a predetermined data sequence. ### Claim 8 (depends on 1) The receiver according to claim 1, wherein the cancellation signal generator comprises a predictor for predicting the interference signal when a confidence for the at least one interference signal parameter determined by the interference signal parameter is below a threshold. ### Claim 9 (depends on 1) The receiver according to claim 1, wherein the at least one interference signal comprises a frame structure comprising a-priori known data fields and varying data fields, the varying data fields comprising payload data or a-priori known interference indicator data, wherein the interference parameter provider is configured for using the a-priori known data fields and the a-priori known interference indicator data in the varying data fields for determining the at least one interference signal parameter. ### Claim 10 (depends on 1) The receiver according to claim 1, wherein the interference parameter provider is configured for identifying the at least one interference signal by evaluating signal inherent properties of the at least one interference signal. ### Claim 11 (depends on 1) The receiver according to claim 1, wherein the wanted signal presents temporal redundancy for error correcting that is exploited to restore the wanted signal during the time intervals where the cancellation is paused. ### Claim 12 (depends on 1) A communication system comprising a transmitter and a receiver according to claim 1. ### Claim 13 (depends on 12) The communication system according to claim 12, further comprising a second receiver configured to transmit the interference signal parameters to the receiver via a communication path. ### Claim 14 A method for interference cancellation at a receiver, the method comprising: receiving an incoming signal, the incoming signal possibly comprising a wanted signal and one or more interference signals, wherein the one or more interference signals comprise one or more predetermined signal at least occasionally; acquiring at least one interference signal parameter regarding at least one known signal component of at least one of the one or more interference signals; generating a cancellation signal on the basis of the at least one interference signal parameter; and cancelling at least partially the one or more interference signals by applying the cancellation signal to the incoming signal; wherein cancelling the one or more interference signals pauses during time intervals in which the one or more interference signal comprises data that is not a-priori known at the receiver. ### Claim 15 (depends on 14) The method according to claim 14, wherein acquiring the interference parameter comprises: providing a predetermined signal that is substantially identical to the at least one known signal component; and performing a correlation of the incoming signal with the predetermined signal and for determining interference signal parameters of the at least one interference signal based on the correlation. ### Claim 16 (depends on 15) The method according to claim 15, wherein generating the cancellation signal comprises receiving the predetermined signal to be used for generating the cancellation signal. ### Claim 17 (depends on 15) The method according to claim 15, further comprising: performing a correlation of the incoming signal with pilot signals of the wanted signal and for determining wanted signal parameters of the wanted signal based on the correlation, wherein the wanted signal parameters are used for the correlation of the incoming signal with the predetermined signal. ### Claim 18 (depends on 15) The method according to claim 15, wherein the generating the cancellation signal comprises determining and applying weighting parameters for the cancellation signal. ### Claim 19 (depends on 15) The method according to claim 15, wherein the known signal component of the at least one interference signal corresponds to predetermined dummy data inserted into the interference signal by an associated interfering transmitter when the interfering transmitter comprises no payload data to transmit. ### Claim 20 (depends on 15) The method according to claim 15, further comprising: providing the predetermined signal on the basis of a predetermined data sequence. ### Claim 21 (depends on 14) The method according to claim 14, wherein generating the cancellation signal comprises predicting the interference signal when a confidence for the at least one interference signal parameter determined by the interference signal parameter is below a threshold. ### Claim 22 (depends on 14) The method according to claim 14, wherein the at least one interference signal comprises a frame structure comprising a-priori known data fields and varying data fields, the varying data fields comprising payload data or a-priori known interference indicator data, wherein the providing the at least one interference parameter comprises using the a-priori known data fields and the a-priori known interference indicator data in the varying data fields for determining the at least one interference signal parameter. ### Claim 23 (depends on 14) The method according to claim 14, wherein providing the at least one interference parameter comprises identifying the at least one interference signal by evaluating signal inherent properties of the at least one interference signal. ### Claim 24 (depends on 14) The method according to claim 14, wherein the wanted signal presents temporal redundancy for error correcting that is exploited to restore the wanted signal during the time intervals where the cancellation is paused. ### Claim 25 (depends on 14) A non-transitory computer-readable medium including a computer program for performing, when the computer program is executed on a computer, the method according to claim 14.