Nonlinear equalizer for measurement while drilling telemetry system

摘要

A nonlinear equalizer aids in transmitting data with more speed and accuracy by reducing nonlinear signal distortion such as found in a mud transmission channel in an MWD telemetry system. The nonlinear equalizer receives an input signal that is modified by at least one nonlinear function element. The nonlinear equalizer also includes multiple linear equalizers: one such linear equalizer receives the unmodified input signal, and the other linear equalizers receive output signals from the nonlinear function elements. Output signals of the linear equalizers are summed to provide the nonlinear equalizer's output signal.