Multi-Channel Timing Recovery System
AssigneeTriductor Technology (Suzhou) Inc.
InventorYaolong Tan
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Abstract
The present invention discloses a novel multi-channel timing recovery scheme that utilizes a shared CORDIC to accurately compute the phase for each tone. Then a hardware-based linear combiner module is used to reconstruct the best phase estimate from multiple phase measurements. The firmware monitors the noise variance for the pilot tones and determines the corresponding weight for each tone to ensure that the minimum phase jitter noise is achieved through the linear combiner. Then a hardware-based second-order timing recovery control loop generates the frequency reference signal for VCXO or DCXO. A single sequentially controlled multiplier is used for all multiplications in the control loop.
Claims17
A timing recovery system, comprising:
- a phase error estimator module for producing a pilot phase error vector for each pilot tone;
- a CORDIC processing module for computing the exact angle error vector for each pilot tone after it receives the pilot phase error vectors from the phase error estimator module;
- a linear combiner module for combining all the angle error vectors of multiple pilot tones from the CORDIC processing module and forming a single phase error reference signal;
- a 2nd order control loop for generating control signal that is started after the linear combiner module already combined all the angle errors;
- and
- a pipeline stage controller for controlling the flow of the data across the timing recovery system and determines when the data will be passed to the next module and when the next module shall start processing the incoming data;
- wherein all the multiplication operations in the timing recovery loop are carried out by a sequentially shared single multiplier.
Dependencies are inferred from the claim text.