# US 9,882,679 B2 · Method and system for improved cross polarization rejection and tolerating coupling between satellite signals > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,882,679 B2 - Document ID: US9882679B2 - Status: Granted - Kind: B2 - Application number: 13/933,865 - Filed: 2013-07-02 - Published: 2014-01-02 - Granted: 2018-01-30 - Earliest claimed: 2012-07-02 - Assignees: MaxLinear, Inc. - Applicants: Raja Pullela; Glenn Chang; Timothy Gallagher - Inventors: Raja Pullela; Glenn Chang; Timothy Gallagher - Web page: https://patentgrep.com/patent/US9882679B2 ## CPC - H04L 1/0091: {arrangements specific to receivers, e.g. format detection (detection of data rate H04L25/0262; detection of coding rate H04L1/0046)} - H04H 40/90: specially adapted for satellite broadcast receiving - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04H: BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N) ## Abstract Methods and systems for improved cross polarization rejection and tolerating of coupling between satellite signals may comprise receiving radio frequency (RF) signals on a chip, where the RF signals comprising a desired signal and at least one crosstalk signal. The received RF signals may be down-converted to baseband frequencies, and the down-converted signals are converted to digital signals. Crosstalk may be determined by estimating complex coupling coefficients between the received RF signals utilizing a de-correlation algorithm across a frequency bandwidth comprising the desired and crosstalk signals. The down-converted signals may be low-pass filtered and summed with an output signal from a cancellation filter. The complex coupling coefficients may be determined utilizing the de-correlation algorithm on the summed signals, and may be used to configure the cancellation filter. Crosstalk may be canceled in a receiver path from a cancellation filter receiving low-pass filtered down-converted signals from another path. ## Claims ### Claim 1 A method for wireless communication, the method comprising: receiving radio frequency (RF) signals on a chip, said RF signals comprising a desired signal and at least one crosstalk signal; down-converting the received RF signals to baseband frequencies; converting the down-converted signals to digital signals; determining crosstalk between channels in the received RF signals by calculating complex coupling coefficients between the received RF signals utilizing a de-correlation algorithm across a frequency bandwidth comprising said desired and crosstalk signals, wherein said crosstalk is approximated as linear within said frequency bandwidth for said calculating complex coupling coefficients and said crosstalk is represented as a sum of an average term and a linearly varying term; and extracting data communicated by said desired signal by utilizing said complex coupling coefficients to cancel the crosstalk between said channels in the received RF signals. ### Claim 2 (depends on 1) The method according to claim 1, wherein said at least one crosstalk signal comprises one or more of: satellite polarization crosstalk and signal bleeding between RF paths in said chip. ### Claim 3 (depends on 1) The method according to claim 1, comprising low-pass filtering the down-converted signals. ### Claim 4 (depends on 3) The method according to claim 3, comprising summing the low-pass filtered down-converted signals with an output signal from a cancellation filter. ### Claim 5 (depends on 4) The method according to claim 4, comprising determining said complex coupling coefficients utilizing said de-correlation algorithm on said summed signals. ### Claim 6 (depends on 5) The method according to claim 5, comprising configuring said cancellation filter utilizing said determined complex coupling coefficients. ### Claim 7 (depends on 6) The method according to claim 6, comprising cancelling crosstalk in a first receiver path on said chip by receiving a signal from a cancellation filter receiving low-pass filtered down-converted signals from a second receiver path on said chip. ### Claim 8 (depends on 6) The method according to claim 6, comprising cancelling crosstalk in said second receiver path on said chip by receiving a signal from a cancellation filter receiving low-pass filtered down-converted signals from said first receiver path on said chip. ### Claim 9 A system for wireless communication, the system comprising: one or more circuits on a chip comprising one or more RF paths, wherein said one or more circuits are operable to: receive radio frequency (RF) signals comprising a desired signal and at least one crosstalk signal; down-convert the received RF signals to baseband frequencies; convert the down-converted signals to digital signals; determine crosstalk between channels in the received RF signals by calculating complex coupling coefficients between the received RF signals utilizing a de-correlation algorithm across a frequency bandwidth comprising said desired and crosstalk signals, wherein said crosstalk is approximated as linear within said frequency bandwidth for said calculating complex coupling coefficients and said crosstalk is represented as a sum of an average term and a linearly varying term; and extract data communicated by said desired signal by utilizing said complex coupling coefficients to cancel the crosstalk between said channels in the received RF signals. ### Claim 10 (depends on 9) The system according to claim 9, wherein said one or more circuits are operable to low-pass filter the down-converted signals. ### Claim 11 (depends on 10) The system according to claim 10, wherein said one or more circuits are operable to sum the low-pass filtered down-converted signals with an output signal from a cancellation filter. ### Claim 12 (depends on 11) The system according to claim 11, wherein said one or more circuits are operable to determine said complex coupling coefficients utilizing said de-correlation algorithm on said summed signals. ### Claim 13 (depends on 12) The system according to claim 12, wherein said one or more circuits are operable to configure said cancellation filter utilizing said determined complex coupling coefficients. ### Claim 14 (depends on 13) The system according to claim 13, wherein said one or more circuits are operable to cancel crosstalk in a first receiver path on said chip from a cancellation filter receiving low-pass filtered down-converted signals from a second receiver path on said chip. ### Claim 15 (depends on 13) The system according to claim 13, wherein said one or more circuits are operable to cancel crosstalk in said second receiver path on said chip from a cancellation filter receiving low-pass filtered down-converted signals from said first receiver path on said chip. ### Claim 16 A method for wireless communication, the method comprising: receiving radio frequency (RF) signals on a chip, said RF signals comprising a desired signal and at least one crosstalk signal; down-converting the received RF signals to baseband frequencies; converting the down-converted signals to digital signals; determining crosstalk between channels in the received RF signals by calculating complex coupling coefficients between the received RF signals utilizing a de-correlation algorithm across a frequency bandwidth comprising said desired and crosstalk signals, said crosstalk being approximated as linear within said frequency bandwidth for said calculating complex coupling coefficients, wherein the de-correlation algorithm comprises a blind source separation algorithm and said crosstalk is represented as a sum of an average term and a linearly varying term; and extracting data communicated by said desired signal by utilizing said complex coupling coefficients to cancel the crosstalk between said channels in the received RF signals. ### Claim 17 (depends on 16) The method according to claim 16, wherein said at least one crosstalk signal comprises one or more of: satellite polarization crosstalk and signal bleeding between RF paths in said chip. ### Claim 18 (depends on 16) The method according to claim 16, comprising low-pass filtering the down-converted signals. ### Claim 19 (depends on 18) The method according to claim 18, comprising summing the low-pass filtered down-converted signals with an output signal from a cancellation filter. ### Claim 20 (depends on 19) The method according to claim 19, comprising determining said complex coupling coefficients utilizing said de-correlation algorithm on said summed signals. ### Claim 21 (depends on 20) The method according to claim 20, comprising configuring said cancellation filter utilizing said determined complex coupling coefficients. ### Claim 22 (depends on 21) The method according to claim 21, comprising cancelling crosstalk in a first receiver path on said chip by receiving a signal from a cancellation filter receiving low-pass filtered down-converted signals from a second receiver path on said chip. ### Claim 23 (depends on 21) The method according to claim 21, comprising cancelling crosstalk in said second receiver path on said chip by receiving a signal from a cancellation filter receiving low-pass filtered down-converted signals from said first receiver path on said chip. ### Claim 24 A system for wireless communication, the system comprising: one or more circuits on a chip comprising one or more RF paths, wherein said one or more circuits are operable to: receive radio frequency (RF) signals comprising a desired signal and at least one crosstalk signal; down-convert the received RF signals to baseband frequencies; convert the down-converted signals to digital signals; determine crosstalk between channels in the received RF signals by calculating complex coupling coefficients between the received RF signals utilizing a de-correlation algorithm across a frequency bandwidth comprising said desired and crosstalk signals, said crosstalk being approximated as linear within said frequency bandwidth for said calculating complex coupling coefficients and said crosstalk being represented as a sum of an average term and a linearly varying term, wherein the de-correlation algorithm comprises a blind source separation algorithm; and extract data communicated by said desired signal by utilizing said complex coupling coefficients to cancel the crosstalk between said channels in the received RF signals. ### Claim 25 (depends on 24) The system according to claim 24, wherein said one or more circuits are operable to low-pass filter the down-converted signals. ### Claim 26 (depends on 25) The system according to claim 25, wherein said one or more circuits are operable to sum the low-pass filtered down-converted signals with an output signal from a cancellation filter. ### Claim 27 (depends on 26) The system according to claim 26, wherein said one or more circuits are operable to determine said complex coupling coefficients utilizing said de-correlation algorithm on said summed signals. ### Claim 28 (depends on 27) The system according to claim 27, wherein said one or more circuits are operable to configure said cancellation filter utilizing said determined complex coupling coefficients. ### Claim 29 (depends on 28) The system according to claim 28, wherein said one or more circuits are operable to cancel crosstalk in a first receiver path on said chip from a cancellation filter receiving low-pass filtered down-converted signals from a second receiver path on said chip. ### Claim 30 (depends on 28) The system according to claim 28, wherein said one or more circuits are operable to cancel crosstalk in said second receiver path on said chip from a cancellation filter receiving low-pass filtered down-converted signals from said first receiver path on said chip.