Patent ID: 11916704
Assignee: HUGHES NETWORK SYSTEMS, LLC
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A method for satellite channel filter distortion compensation in a satellite demodulator, the method comprising:
receiving a channel-distorted sample stream as output by an analog-to-digital converter (ADC) block responsive to the ADC block receiving analog forward downlink communications via a satellite channel, the forward downlink communications manifesting satellite channel filter distortions associated with one or more channel filters in the satellite channel;
buffering the channel-distorted sample stream in a training buffer;
receiving a trigger signal responsive to detecting decoding of a pre-equalizer frame code by a demodulator path, wherein the forward downlink communications include a sequence of communication frames having at least one pre-equalizer frame that each encodes an instance of the pre-equalizer frame code and an instance of a predetermined training sequence of digital symbols, such that the trigger signal indicates receipt of the at least one pre-equalizer frame and corresponding presence in the training buffer of a segment of the channel-distorted sample stream representing at least the predetermined training sequence of digital symbols;
computing, responsive to the trigger signal, an updated set of compensation filter coefficients based on correlating the at least a portion of the channel-distorted sample stream to the predetermined training sequence;
generating, simultaneously with the buffering, an undistorted sample stream by filtering the channel-distorted sample stream based on the updated set of compensation filter coefficients previously computed to at least partially compensate for the satellite channel filter distortions of the satellite channel; and
outputting the undistorted sample stream to a demodulator path.