# US 9,882,669 B1 · Activating interference signal rejection filter path based on detection of an interference signal in a wireless distribution system (WDS) > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,882,669 B1 - Document ID: US9882669B1 - Status: Granted - Kind: B1 - Application number: 15/473,802 - Filed: 2017-03-30 - Published: 2018-01-18 - Granted: 2018-01-30 - Earliest claimed: 2016-07-13 - Assignees: Corning Optical Communications Wireless Ltd - Applicants: Corning Optical Communications Wireless Ltd - Inventors: Ronen Schwartzman - Web page: https://patentgrep.com/patent/US9882669B1 ## CPC - H04J 11/0023: {Interference mitigation or co-ordination (direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541)} - H04B 1/1036: {with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters (H04B1/123 takes precedence; filter circuits H03H)} - H04B 1/40: Circuits - H04B 1/406: {with more than one transmission mode, e.g. analog and digital modes} - H04B 17/345: Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) - H04L 43/028: by filtering - H04L 43/16: Threshold monitoring - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04B 2001/1045: {Adjacent-channel interference} - H04W 84/12: WLAN [Wireless Local Area Networks] - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04B: TRANSMISSION - 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 Embodiments of the disclosure relate to activating an interference signal rejection filter path based on detection of an interference signal in a wireless distribution system (WDS). In this regard, in one aspect, a filter path selection circuit is configured to activate an interference rejection filter path configured to suppress a predefined interference signal when the predefined interference signal is detected in a received radio frequency (RF) signal. In another aspect, the filter path selection circuit is configured to detect the predefined interference signal by comparing a measured power level of the predefined interference signal against a predefined power threshold. By activating the interference rejection filter path to suppress the predefined interference signal based on detection of the predefined interference signal, it is possible to dynamically respond to the predefined interference signal that may randomly appear in the WDS, thus providing an enhanced overall RF performance in the WDS. ## Claims ### Claim 1 A wireless distribution system (WDS), comprising: a central unit configured to: communicate a plurality of downlink communications signals via a plurality of downlink communications mediums; and receive a plurality of uplink communications signals via a plurality of uplink communications mediums; and a plurality of remote units configured to: receive the plurality of downlink communications signals via the plurality of downlink communications mediums; and communicate the plurality of uplink communications signals via the plurality of uplink communications mediums; wherein each of the plurality of remote units comprises a filter path selection system that comprises: a filter path selection circuit, comprising: an interference rejection filter path comprising a first radio frequency (RF) filter, the first RF filter configured to: receive an RF signal from a first filter path input provided in the interference rejection filter path and communicatively coupled to one or more client devices in the WDS; and filter the received RF signal at a first rejection level to generate a first filter path output signal; a pass filter path comprising a second RF filter, the second RF filter configured to: receive the RF signal from a second filter path input provided in the pass filter path and communicatively coupled to the one or more client devices; and filter the received RF signal at a second rejection level lower than the first rejection level to generate a second filter path output signal; and a controller configured to: determine whether the RF signal comprises a predefined interference signal based on a measured power level of the predefined interference signal; couple the RF signal to the first filter path input of the interference rejection filter path if the measured power level of the predefined interference signal is higher than a predefined power threshold; and couple the RF signal to the second filter path input of the pass filter path if the measured power level of the predefined interference signal is lower than or equal to the predefined power threshold; and a power measurement circuit comprising a power detector, the power detector configured to: determine the measured power level of the predefined interference signal in the RF signal; and provide the measured power level of the predefined interference signal to the controller. ### Claim 2 (depends on 1) The WDS of claim 1, wherein each remote unit among the plurality of remote units is configured to communicate the first filter path output signal as an uplink communications signal among the plurality of uplink communications signals if the measured power level of the predefined interference signal is higher than the predefined power threshold. ### Claim 3 (depends on 2) The WDS of claim 2, wherein each remote unit among the plurality of remote units is configured to communicate the second filter path output signal as an uplink communications signal among the plurality of uplink communications signals if the measured power level of the predefined interference signal is less than or equal to the predefined power threshold. ### Claim 4 (depends on 2) The WDS of claim 2, wherein: the central unit comprises an electrical-to-optical (E/O) converter configured to provide the plurality of downlink communications signals as a plurality of optical downlink communications signals, respectively; and the plurality of remote units comprises a plurality of remote unit optical-to-electrical (O/E) converters configured to receive the plurality of optical downlink communications signals, respectively. ### Claim 5 (depends on 4) The WDS of claim 4, wherein: the plurality of remote units comprises a plurality of remote unit electrical-to-optical (E/O) converters configured to provide the plurality of uplink communications signals as a plurality of optical uplink communications signals, respectively; and the central unit comprises an optical-to-electrical (O/E) converter configured to receive the plurality of optical uplink communications signals, respectively. ### Claim 6 (depends on 1) The WDS of claim 1, wherein each remote unit among the plurality of remote units is configured to communicate the second filter path output signal as an uplink communications signal among the plurality of uplink communications signals if the measured power level of the predefined interference signal is less than or equal to the predefined power threshold. ### Claim 7 (depends on 6) The WDS of claim 6, wherein: the central unit comprises an electrical-to-optical (E/O) converter configured to provide the plurality of downlink communications signals as a plurality of optical downlink communications signals, respectively; and the plurality of remote units comprises a plurality of remote unit optical-to-electrical (O/E) converters configured to receive the plurality of optical downlink communications signals, respectively. ### Claim 8 (depends on 7) The WDS of claim 7, wherein: the plurality of remote units comprises a plurality of remote unit electrical-to-optical (E/O) converters configured to provide the plurality of uplink communications signals as a plurality of optical uplink communications signals, respectively; and the central unit comprises an optical-to-electrical (O/E) converter configured to receive the plurality of optical uplink communications signals, respectively. ### Claim 9 (depends on 1) The WDS of claim 1, wherein the plurality of remote units comprises: a plurality of remote unit optical-to-electrical (O/E) converters configured to receive the plurality of downlink communications signals, respectively; a plurality of remote unit electrical-to-optical (E/O) converters configured to provide the plurality of uplink communications signals as a plurality of optical uplink communications signals, respectively. ### Claim 10 (depends on 9) The WDS of claim 9, wherein each remote unit comprises at least one radio transceiver, and wherein each remote unit is configured to communicate with client devices within range of the remote unit. ### Claim 11 (depends on 1) The WDS of claim 1, wherein each remote unit comprises at least one radio transceiver, and wherein each remote unit is configured to communicate with client devices within range of the remote unit. ### Claim 12 A wireless distribution system (WDS), comprising: a plurality of optical communications mediums; and a plurality of remote units comprising a plurality of electrical-to-optical (E/O) converters and coupled to the plurality of optical communications mediums, the plurality of remote units configured to: receive the plurality of downlink communications signals via the plurality of optical communications mediums; and communicate the plurality of uplink communications signals via the plurality of optical communications mediums; wherein each of the plurality of remote units comprises a filter path selection system that comprises: a filter path selection circuit, comprising: an interference rejection filter path comprising a first radio frequency (RF) filter, the first RF filter configured to: receive an RF signal from a first filter path input provided in the interference rejection filter path and communicatively coupled to one or more client devices in the WDS; and filter the received RF signal at a first rejection level to generate a first filter path output signal; a pass filter path comprising a second RF filter, the second RF filter configured to: receive the RF signal from a second filter path input provided in the pass filter path and communicatively coupled to the one or more client devices; and filter the received RF signal at a second rejection level lower than the first rejection level to generate a second filter path output signal; and a controller configured to: determine whether the RF signal comprises a predefined interference signal based on a measured power level of the predefined interference signal; couple the RF signal to the first filter path input of the interference rejection filter path if the measured power level of the predefined interference signal is higher than a predefined power threshold; and couple the RF signal to the second filter path input of the pass filter path if the measured power level of the predefined interference signal is lower than or equal to the predefined power threshold; and a power measurement circuit comprising a power detector, the power detector configured to: determine the measured power level of the predefined interference signal in the RF signal; and provide the measured power level of the predefined interference signal to the controller. ### Claim 13 (depends on 12) The WDS of claim 12, wherein each remote unit among the plurality of remote units is configured to communicate the first filter path output signal as an uplink communications signal among the plurality of uplink communications signals if the measured power level of the predefined interference signal is higher than the predefined power threshold. ### Claim 14 (depends on 13) The WDS of claim 13, wherein each remote unit among the plurality of remote units is configured to communicate the second filter path output signal as an uplink communications signal among the plurality of uplink communications signals if the measured power level of the predefined interference signal is less than or equal to the predefined power threshold. ### Claim 15 (depends on 12) The WDS of claim 12, wherein each remote unit among the plurality of remote units is configured to communicate the second filter path output signal as an uplink communications signal among the plurality of uplink communications signals if the measured power level of the predefined interference signal is less than or equal to the predefined power threshold. ### Claim 16 (depends on 15) The WDS of claim 15, wherein each remote unit comprises at least one radio transceiver, and wherein each remote unit is configured to communicate with client devices within range of the remote unit. ### Claim 17 (depends on 12) The WDS of claim 12, wherein each remote unit comprises at least one radio transceiver, and wherein each remote unit is configured to communicate with client devices within range of the remote unit.