Patent ID: 11962363
Assignee: MAXLINEAR, INC.
Field: Control (Instruments)
Classification: CPC H  G | IPC G  H

Claim 8:
9. The method of claim 1, further comprising performing a calibration of the communication system, comprising:
a first stage including determining a forward peak location and a reverse peak location based on a first system impulse response and a second system impulse response, comprising:
generating a first load condition where a characteristic impedance is substantially equal to a load impedance;
obtaining, at the first port, the first impulse response of the communication system;
approximating the forward peak location using the first impulse response;
generating a second load condition where the characteristic impedance is not equal to the load impedance;
obtaining, at the first port, the second impulse response of the communication system;
approximating the reverse peak location using the second impulse response; and
approximating a delay by obtaining a difference between the forward peak location and the reverse peak location; and
a second stage including adjusting results of the first stage by accounting for system deviations at various load angles, comprising:
generating the first load condition;
outputting a first sample signal and running the first sample signal through a VSWR algorithm;
generating the second load condition;
outputting a second sample signal and running the second sample signal through the VSWR algorithm;
generating one or more additional load conditions, the additional load conditions including the characteristic impedance not equal to the load impedance such that a known VSWR magnitude associated with the one or more additional load conditions differs from other load conditions;
outputting one or more additional sample signals and running the one or more additional sample signals through the VSWR algorithm;
sweeping the forward peak location and the reverse peak location in two dimensions to determine a recomputed forward peak location and a recomputed reverse peak location;
storing the recomputed forward peak location and the recomputed reverse peak location; and
determining one or more scalar coefficients to use in estimating the VSWR associated with the transmission line.