Receiver Phase Synchronization via EVM Minimization
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Solution Overview
Problem
Receivers face challenges in accurately synchronizing phase under weak signal conditions, leading to insufficient resolution and increased system power consumption and cost, especially in high requirement systems.
Innovation Solution
A receiver design that includes a sync detector, an interpolator to generate interpolated phases, and a calculator to determine the error vector magnitude (EVM) for each phase, allowing for improved phase synchronization by selecting the phase with the minimum EVM for payload signal output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the demodulation rate is reduced to lower power consumption and cost, then power consumption and cost are reduced, but phase synchronization accuracy deteriorates due to insufficient resolution (at least 1/16 symbol error)
Solution Approach 1:
The invention segments the phase search space by dividing it into multiple phase regions, each corresponding to a different demodulation rate. The sync detector independently searches for sync words in each phase region, allowing the system to achieve fine phase resolution without requiring a high overall demodulation rate, thus maintaining low power consumption while improving synchronization accuracy.
Solution Approach 2:
The invention introduces a new dimension of phase region division, transforming the single-dimension phase search into a multi-dimensional search space. By adding the phase region dimension, the system can achieve finer phase resolution without increasing the demodulation rate, effectively resolving the contradiction between power consumption and synchronization accuracy.
2Measurement precision
If the demodulation rate is increased to improve phase synchronization resolution, then phase synchronization accuracy is improved, but power consumption and cost significantly increase
Solution Approach 1:
The invention segments the phase search space into multiple phase regions, each handled by a lower demodulation rate. This allows the system to achieve fine phase resolution through multiple coarse searches rather than one fine search, significantly reducing power consumption while maintaining synchronization accuracy.
Solution Approach 2:
The invention performs partial searches in multiple phase regions rather than requiring a complete high-resolution search in one region. By performing multiple partial searches at lower demodulation rates, the system achieves the same synchronization accuracy as a single high-rate search would provide, but with reduced power consumption.
3Measurement precision
If a sync word with more symbols is used to improve phase matching accuracy, then phase synchronization accuracy is improved, but transmission efficiency decreases and system complexity increases
Solution Approach 1:
The invention segments the phase search process into multiple independent phase region searches, each using a standard-length sync word. This approach achieves high phase matching accuracy through the segmentation of the search space rather than extending the sync word length, thereby maintaining transmission efficiency while improving accuracy.
Solution Approach 2:
The invention performs preliminary phase region identification before detailed sync word matching. By first determining which phase region contains the sync word, the system can then focus the detailed matching process on that specific region, achieving high accuracy without requiring extended sync words and maintaining transmission efficiency.
Data Source
AI summary
A receiver for determining sample phase comprises a sync detector to output a sample phase; an interpolator communicatively coupled to the sync detector and to generate a plurality of interpolated phases, wherein each of the interpolated phase and phases within the phase set corresponds to a respective syncword; a calculator communicatively coupled to the interpolator to calculate an error vector magnitude (EVM) of syncword corresponding respectively to each of the interpolated phase and to each of the phase within a phase set, and determine the minimum EVM among EVMs for the syncword corresponding to each of the interpolated phase and the EVM of syncword corresponding to each of the phase within the phase set; and an output unit communicatively coupled to the calculator and configured to sample and output payload signals at the phase corresponding to the minimum EVM.