Radio Receiver Synchronization via Peak Subset Scoring
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Solution Overview
Problem
Existing radio receiver synchronization methods face challenges in achieving accurate and fast synchronization, especially over noisy channels and with frequency offsets, leading to potential packet errors or losses.
Innovation Solution
A radio apparatus and method that correlate signal data with stored synchronization data to identify subsets of peaks with valid timing patterns, calculate correlation scores, and select the best subset to determine timing- or frequency-synchronization information, improving receiver sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional synchronization methods are used, then the synchronization process is simple, but synchronization accuracy deteriorates under noisy channels and frequency offsets
Solution Approach 1:
The patent segments the set of correlation peaks into multiple subsets based on timing criteria. Each subset represents a potential synchronization candidate with peaks that satisfy specific timing relationships. This segmentation allows the system to evaluate multiple hypotheses and select the best one, improving accuracy without requiring a completely complex new approach.
Solution Approach 2:
The patent identifies more peaks than the minimum required for synchronization by creating multiple subsets of peaks. This excessive action of finding additional peaks and evaluating multiple subsets ensures that even if some peaks are spurious, the correct synchronization information can be extracted from the highest-scoring subset, thereby improving reliability.
2Reliability
If more peaks are identified to improve accuracy, then the risk of spurious peaks increases, but selecting the best subset resolves this issue
Solution Approach 1:
The patent implements a feedback mechanism where each peak subset is evaluated using a correlation score calculated from the correlation values of its peaks. This scoring system provides feedback that allows the system to compare different subsets objectively and select the one with the highest score, thereby identifying the most reliable synchronization information while filtering out spurious peaks.
Solution Approach 2:
The patent changes the evaluation parameter from simply detecting any valid timing pattern to calculating a correlation score that combines both timing validity and correlation strength. This parameter change allows the system to distinguish between peaks that merely satisfy timing criteria and those that represent true synchronization signals, improving reliability.
3Productivity
If fast synchronization is achieved with fewer peaks, then accuracy may be compromised, but the patent balances speed and accuracy through subset selection
Solution Approach 1:
The patent performs preliminary actions by identifying all correlation peaks and organizing them into multiple subsets before selecting the best one. This preliminary organization of data into timing-valid subsets allows for efficient evaluation, as the system only needs to score and compare pre-organized subsets rather than searching through all possible peak combinations, thereby maintaining both speed and accuracy.
Data Source
AI summary
A radio apparatus correlates signal data with stored synchronization data to determine correlation data. The signal data represents a received radio-frequency signal that encodes a data frame, which has a synchronization preamble with a plurality of instances of a predetermined synchronization sequence. The stored synchronization data represents the predetermined synchronization sequence. The radio apparatus identifies a set of peaks in the correlation data, and uses a timing criterion to identify a plurality of subsets of the set of peaks, such that time values of the peaks of each identified subset satisfy the timing criterion. The radio apparatus calculates a correlation score Cj for each of the identified subsets from correlation values of the subset's peaks, and uses the correlation scores Cj to select a subset from the plurality of subsets. Timing or frequency synchronization information for the radio apparatus is determined from the peaks of the selected subset.