Modulation analysis and distortion identification

摘要

An apparatus, method, computer readable medium, and system are provided to generate a symbol placement associated with a transmission scheme by transforming a retrieved set of equalization coefficients. Symbols included in the symbol placement may be analyzed and quantified in terms of their distance from a decision boundary. Symbols may be synthesized on an iterative basis in order to obtain visibility into the underlying performance of the transmission scheme over time. If equalization is unable to reduce a signal impairment below a threshold value within a predetermined amount of time, then a determination may be made that a non-linear distortion source is present in a network or communication system. Signals received from a plurality of user terminals may be compared with one another in order to determine a probable location or cause of the non-linear distortion.

主权项

1. A method comprising:
generating, by a first computing device, a first symbol placement associated with a transmission scheme and based on a set of pre-equalization coefficients; updating the first symbol placement associated with the transmission scheme responsive to receiving a second set of equalization coefficients from a second computing device; and transmitting, based on the first symbol placement, a status message indicating one or more symbols that satisfy a threshold indicative of likely demodulation error at a receiver.