Bit synchronizer for detecting symbol timing error for high order modulation using a trajectory mid-point rotation and related methods

摘要

A communications device includes an input that receives a communications signal having in-phase (I) and Quadrature (Q) signal components. A bit synchronization circuit detects the symbol timing error in the communications signal and includes a symbol mapper circuit configured to receive I and Q signal components and determine transition samples of vectors within the signal constellation. A rotation generator circuit is coupled to the symbol mapper circuit and configured to rotate the trajectory of the transition samples at their midpoints to determine the symbol timing error.

主权项

1. A communications device, comprising:
an input configured to receive a communications signal having in-phase (I) and Quadrature (Q) signal components; a bit synchronization circuit operable to receive the communications signal and detect the symbol timing error in the communications signal, and comprising,
a symbol mapper circuit configured to receive I and Q signal components and determine transition samples of vectors within the signal constellation as constellation on-time samples; anda rotation generator circuit coupled to the symbol mapper circuit and configured to rotate the trajectory of the transition samples at their midpoints based on hard decisions of the constellation on-time samples to determine the symbol timing error.