LPC filter for removing periodic and quasi-periodic interference from spread spectrum signals

A method for filtering out periodic and/or quasi-periodic interference from a spread spectrum signal that comprises a transmitted data component and a periodic and/or quasi-periodic interference component, the method comprising:

• receiving said spread spectrum signal;
• digitizing said received spread spectrum signal;
• using a linear predictive coding filter having a gradient adaptive lattice structure to determine linear predictive coefficients and error coefficients corresponding to said digitized spread spectrum signal;
• providing said error coefficients to a synthesis filter;
• and
• employing said synthesis filter to recover said transmitted data component from said received spread spectrum signal, based on said error coefficients and not based on said linear predictive coefficients, such that the periodic and/or quasi-periodic interference component is substantially filtered out.

A signal filtering method, comprising:

• receiving a spread spectrum signal, the spread spectrum signal comprising a transmitted data component and a periodic and/or quasi-periodic interference component;
• digitizing the received spread spectrum signal;
• determining, using a linear predictive coding filter, linear predictive coefficients and error coefficients corresponding to the digitized spread spectrum signal;
• providing the error coefficients to a synthesis filter;
• and
• employing the synthesis filter to recover the transmitted data component from the received spread spectrum signal, based on the provided error coefficients and not based on the linear predictive coefficients, such that the periodic and/or quasi-periodic interference component is substantially filtered out.

A receiver comprising:

• antenna circuitry for receiving a spread spectrum signal that comprises a transmitted data component and a periodic and/or quasi-periodic interference component;
• an analog-to-digital converter configured to digitize the spread spectrum signal received by the antenna circuitry;
• and
• processing circuitry that is configured to a) determine linear predictive coefficients and error coefficients corresponding to the digitized spread spectrum signal;
• b) provide the error coefficients to a synthesis filter;
• and c) recover, with the synthesis filter, the transmitted data component in the digitized spread spectrum signal, based on the provided error coefficients, and not based on the linear predictive coefficients, such that the periodic and/or quasi-periodic interference component is substantially filtered out.