Receiver Device Phase Offset Compensation Using Unique Words
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Solution Overview
Problem
In optical or wireless transmission, phase and frequency offsets due to instability or mismatched receive ports cannot be completely compensated by existing methods, especially in optical transmission where carrier frequency stability is lower.
Innovation Solution
A receiver device and method that includes a timing detector, frequency offset compensator, Fourier transform unit, equalizer, inverse Fourier transform unit, and phase offset estimator and compensator, using a unique word in each signal block to estimate and compensate for phase and frequency offsets in the frequency domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional frequency offset compensation using preamble signals is used, then frequency offset can be compensated, but phase offset cannot be completely compensated when there is temporal phase offset instability or fluctuation
Solution Approach 1:
The patent applies preliminary action by performing phase offset compensation using unique words before the main data processing. The phase offset is estimated and compensated in advance using the unique words that are embedded in each signal block, allowing the system to prepare for and counteract phase offset issues before they affect the main data transmission. This preliminary compensation step ensures that subsequent processing operates on already-corrected signals.
Solution Approach 2:
The patent implements feedback by continuously estimating phase offset using unique words in each signal block and applying compensation based on this estimation. The system measures the actual phase offset through the unique words, feeds this information back into the compensation mechanism, and adjusts the compensation accordingly. This closed-loop feedback approach allows the system to adapt to temporal phase offset instability and maintain accurate compensation throughout transmission.
2Measurement precision
If conventional frequency offset compensation is used, then frequency offset can be compensated, but compensation fails when frequency offsets of receive ports do not match
Solution Approach 1:
The patent applies local quality by performing phase offset estimation and compensation independently for each receive port using the unique words specific to each port's signal block. Instead of applying a uniform compensation approach across all ports, the system tailors the compensation to the specific characteristics of each port, allowing each port to be compensated according to its own unique word-based measurements. This port-specific local processing enables the system to handle mismatched frequency offsets across different ports effectively.
3Productivity
If single-carrier reception with frequency-domain equalization is used, then data can be recovered, but phase and frequency offsets due to instability cannot be completely compensated
Solution Approach 1:
The patent introduces unique words as an intermediary element that mediates between the transmitted signal and the reception process. These unique words serve as reference markers embedded in each signal block that facilitate accurate phase and frequency offset measurement. By using these intermediary unique words as intermediaries for measurement and compensation, the system achieves higher precision offset compensation without compromising data recovery capability. The unique words act as a bridge that enables precise measurement without interfering with the main data transmission.
Data Source
AI summary
A receiver device receives a signal inputted to one or a plurality of ports as a plurality of received signals, and includes: a phase offset estimating unit that, on the basis of a unique word of each signal block contained in said received signal, estimates the phase offset, and a phase offset compensating unit that, on the basis of a phase offset estimated by said phase offset estimating unit, compensates the phase offset; the receiver device uses a known signal component (unique word) contained in a frequency-domain equalized signal to compensate the phase offset, whereby it compensates complex phase offset fluctuation, and estimates the phase offset of a signal obtained at each port.