Method, system and storage medium of proportional-integral-derivative based automatic gain control for satellite transponder system under partial-time partial-band additive white gaussian noise jamming

A system, comprising:

• a memory, configured to store program instructions for performing a method of proportional-integral-derivative (PID) based automatic gain control (AGC) for a satellite transponder system under partial-time partial-band additive white Gaussian noise (AWGN) jamming;
• and
• a processor, coupled with the memory and, when executing the program instructions, configured for:
• receiving a sequence of sample signals by a AGC processor after an analog-digital-converter (ADC) in the satellite transponder system;
• determining two different block sizes from the sequence of sample signals wherein a block size of a first block of sample signals is greater than a block size of a second block of sample signals;
• using the block size of the first block to compute a first signal-amplitude-ratio (SAR)-based gain value and using the block size of the second block to compute a second signal-amplitude-ratio (SAR)-based gain value by the AGC processor through the sequence of sample signals;
• and
• if the first SAR-based gain value is greater than an amplitude threshold, calculating a to-be-applied gain control value of an m-th transmitted symbol at a n-th time step using the second SAR-based gain value, a tracking error at a (n−1)-th time step, a summation of a plurality of tracking errors from a 1-st time step to the (n−1)-th time step, and a tracking error difference between the tracking error at the (n−1)-th time step and a tracking error at a (n−2)-th time step;
• or
• if the first SAR-based gain value is equal to or less than the amplitude threshold, calculating a to-be-applied gain control value of an m-th transmitted symbol at a n-th time step using a minimum difference between an estimated amplitude and each of reference amplitudes in a lookup table (LUT), and the tracking error difference between the tracking error at a (n−1)-th time step and the tracking error at a (n−2)-th time step.

A non-transitory computer-readable storage medium, containing program instructions for, when being executed by a processor, performing a method of proportional-integral-derivative (PID) based automatic gain control (AGC) for a satellite transponder system under partial-time partial-band additive white Gaussian noise (AWGN) jamming;

• the method comprising:
• receiving a sequence of sample signals by a AGC processor after an analog-digital-converter (ADC) in the satellite transponder system;
• determining two different block sizes from the sequence of sample signals wherein a block size of a first block of sample signals is greater than a block size of a second block of sample signals;
• using the block size of the first block to compute a first signal-amplitude-ratio (SAR)-based gain value and using the block size of the second block to compute a second signal-amplitude-ratio (SAR)-based gain value by the AGC processor through the sequence of sample signals;
• and
• if the first SAR-based gain value is greater than an amplitude threshold, calculating a to-be-applied gain control value of an m-th transmitted symbol at a n-th time step using the second SAR-based gain value, a tracking error at a (n−1)-th time step, a summation of a plurality of tracking errors from a 1-st time step to the (n−1)-th time step, and a tracking error difference between the tracking error at the (n−1)-th time step and a tracking error at a (n−2)-th time step;
• or
• if the first SAR-based gain value is equal to or less than the amplitude threshold, calculating a to-be-applied gain control value of an m-th transmitted symbol at a n-th time step using a minimum difference between an estimated amplitude and each of reference amplitudes in a lookup table (LUT), and the tracking error difference between the tracking error at a (n−1)-th time step and the tracking error at a (n−2)-th time step.