# US 2014/0153679 A1 · System for and Method of Removing Unwanted Inband Signals from a Received Communication Signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153679 A1 - Document ID: US20140153679A1 - Status: Published application - Kind: A1 - Application number: 13/778,079 - Filed: 2013-02-26 - Published: 2014-06-05 - Earliest claimed: 2009-12-03 - Assignees: Glowlink Communications Technology, Inc. - Inventors: Michael L. Downey; Jeffrey C. Chu - Web page: https://patentgrep.com/patent/US20140153679A1 ## CPC - H04L 1/0036: {arrangements specific to the receiver} - H04B 1/1027: {assessing signal quality or detecting noise/interference for the received signal} - H04J 11/004: {using regenerative subtractive interference cancellation} - H04L 25/03057: {with a recursive structure (H04L25/03031 takes precedence)} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - 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) ## Abstract A system for and method of removing one or more unwanted inband signals from a received communications signal is described. The inband signal or signals may comprise noise, interference signals, or any other unwanted signals that impact the quality of the underlying communications. A receiver receives a communication signal, the received communication signal including the desired communication signal and one or more inband signals. A signal separator processes the received signal to form an estimate of the desired communication signal and an estimate of the inband signals. A performance improver processes the received signal and the estimate of the one or more inband signals to form an improved estimate of the desired communication signal and an improved estimate of the inband signals. ## Claims ### Claim 1 A system for removing one or more inband signals from a received communication signal comprising: a receiver that receives a signal that includes a desired communication signal and one or more unwanted inband signals; a signal separator that processes the received signal to form an estimate of the desired communication signal and an estimate of the inband signals, wherein the signal processor demodulates the received signal to form a demodulated signal and remodulates the demodulated signal to form the estimate of the desired communication signal and wherein the signal processor performs adaptive noise cancellation on the received signal using the estimate of the desired communication signal to form the estimate of the one or more inband signals; and a performance improver that processes the received signal and the estimate of the one or more inband signals to form an improved estimate of the desired communication signal and an improved estimate of the inband signals, wherein the performance improver comprises an adaptive filter that takes as input the received signal and the estimate of the one or more inband signals to form the improved estimate of the desired communication signal and the improved estimate of the inband signals. ### Claim 2 (depends on 1) The system according to claim 1, wherein the power of the desired received communication signal is greater than the aggregate received power of the inband signals and the signal processer uses the greater power of the desired communication signal to lock to the desired communication signal to form the demodulated signal. ### Claim 3 (depends on 1) The system according to claim 1, wherein the signal processor forms the estimate of the desired communication signal and the estimate of the inband signals without prior knowledge of characteristics of the inband signals and without obtaining a copy of any of the inband signals from any source other than the received signal. ### Claim 4 (depends on 1) The system according to claim 1, wherein the signal processor forms the estimate of the desired communication signal and the estimate of the inband signals using only the received signal as input. ### Claim 5 (depends on 1) The system according to claim 1, wherein the signal processor at least temporarily stores a portion of the received signal during said processing of the received signal. ### Claim 6 (depends on 1) The system according to claim 1, further comprising processing the improved estimate of the one or more inband signals to determine their properties. ### Claim 7 (depends on 6) The system according to claim 6, wherein the properties of the interfering signal comprise spectral properties. ### Claim 8 (depends on 6) The system according to claim 6, further comprising displaying the properties of the one or more inband signals. ### Claim 9 (depends on 1) The system according to claim 1, wherein the desired communication signal is a first desired communication signal and the one or more inband signals comprise a second desired communication signal that overlaps the first desired communication signal in both frequency and time and wherein the estimate of the in-band signals comprises an estimate of the second desired communication signal thereby the first and second desired communication signals are both recovered from the received signal. ### Claim 10 (depends on 1) The system according to claim 1, wherein the desired communication signal is a first desired communication signal and the one or more inband signals comprise two or more additional desired communication signals that overlap the first desired communication signal in both frequency and time and wherein the estimate of the one or more in-band signals is recursively processed to recover each of the two or more additional desired communication signals. ### Claim 11 (depends on 1) The system according to claim 1, wherein the signal processor comprises an adaptive equalizer that is used in the demodulation of the received signal to form the demodulated signal. ### Claim 12 (depends on 1) The system according to claim 1, wherein the signal processor comprises a matched filter that is used in the demodulation of the received signal to form the demodulated signal. ### Claim 13 (depends on 1) The system according to claim 1, wherein the desired communication signal includes forward error correction information and the signal processor performs forward error correction on the estimate of the desired communication signal. ### Claim 14 (depends on 1) The system according to claim 1, further comprising re-sampling the estimate of the desired communication signal to match a sampling rate of the desired communication signal. ### Claim 15 (depends on 14) The system according to claim 14, further comprising performing pulse shaping on the estimate of the desired communication signal. ### Claim 16 (depends on 1) The system according to claim 1, wherein the one or more inband signals comprise random noise. ### Claim 17 (depends on 1) The system according to claim 1, wherein the one or more inband signals comprises an interfering signal having a source that is independent from that of the desired communication signal. ### Claim 18 A method of removing one or more inband signals from a received communication signal comprising: obtaining a received communication signal, the received communication signal including a desired communication signal and one or more inband signals; processing the received communication signal using a signal separator to form an estimate of the desired communication signal and an estimate of the inband signals signals, wherein the signal processor demodulates the received signal to form a demodulated signal and remodulates the demodulated signal to form the estimate of the desired communication signal and wherein the signal processor performs adaptive noise cancellation on the received signal using the estimate of the desired communication signal to form the estimate of the one or more inband signals; and processing the received signal and the estimate of the one or more inband signals using a performance improver to form an improved estimate of the desired communication signal and an improved estimate of the inband signals, wherein the performance improver comprises an adaptive filter that takes as input the received signal and the estimate of the one or more inband signals to form the improved estimate of the desired communication signal and the improved estimate of the inband signals. ### Claim 19 A non-transitory computer readable media having stored thereon computer code which when executed by a processor causes the processor to perform a method of removing inband signals from a received communication signal, the method comprising: obtaining a received communication signal, the received communication signal including a desired communication signal and one or more inband signals; processing the received communication signal using a signal separator to form an estimate of the desired communication signal and an estimate of the inband signals signals, wherein the signal processor demodulates the received signal to form a demodulated signal and remodulates the demodulated signal to form the estimate of the desired communication signal and wherein the signal processor performs adaptive noise cancellation on the received signal using the estimate of the desired communication signal to form the estimate of the one or more inband signals; and processing the received signal and the estimate of the one or more inband signals using a performance improver to form an improved estimate of the desired communication signal and an improved estimate of the inband signals, wherein the performance improver comprises an adaptive filter that takes as input the received signal and the estimate of the one or more inband signals to form the improved estimate of the desired communication signal and the improved estimate of the inband signals.