Patent ID: 9584347
Date: 2017-02-28
CPC Classifications: H04L

Claim:
1. A receiver system for detecting digital content in a radio frequency (RF) channel, comprising: front-end circuitry configured to receive radio frequency (RF) signals and to output signals associated with a channel within the RF signals; analog-to-digital conversion (ADC) circuitry configured to receive the output signals and to output digital samples having a real component (I) and an imaginary component (Q); complex magnitude determination circuitry configured to receive the digital samples and to generate complex magnitudes for the digital samples; sliding window averaging filter circuitry configured to subsample the complex magnitudes for each of a plurality of symbols, to apply a sliding window average to the subsampled complex magnitudes to generate a plurality of averaged subsampled magnitude values for each symbol based upon subsampled complex magnitudes within sliding windows of subsampled complex magnitudes, and to output the averaged subsampled magnitude values for each symbol; and shape detection circuitry configured to determine if digital content is present within the channel having a digital content shaping function, the digital content shaping function being associated with digital content to be detected, the shape detection circuitry comprising: wherein the digital content is included within OFDM (orthogonal frequency division multiplexed) symbols transmitted within the channel, and wherein the digital content shaping function comprises a pulse shaping function applied to each OFDM symbol.