DTMB Receiver PN Phase Detection With Reduced Computation
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Solution Overview
Problem
DTMB receivers face challenges in efficiently detecting pseudorandom noise phases due to varying initial phase offsets in received symbols, which complicates synchronization and requires efficient calculation methods to process large payloads effectively.
Innovation Solution
A method involving selecting a detection range of symbols, applying FFT, phase rotation, differential operations, and calculating a value Q based on summations to determine the PN phase offset, minimizing calculations and hardware complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PN phase detection is performed on all symbols in a DTMB frame, then detection accuracy is improved, but computational complexity and hardware requirements increase significantly
Solution Approach 1:
The patent divides the complete set of symbols in a DTMB frame into multiple detection ranges, where each range contains a subset of symbols. Instead of processing all symbols simultaneously, the system selects and processes only the symbols within the current detection range, reducing the computational burden while maintaining detection accuracy through systematic sampling of the symbol sequence.
Solution Approach 2:
The patent applies partial action by processing only a subset of symbols (detection range) rather than the entire frame. This selective processing approach reduces the number of calculations required while still providing sufficient accuracy for PN phase detection, avoiding the excessive computational complexity that would result from processing all symbols.
2Measurement precision
If PN phase detection is performed on all symbols in a DTMB frame, then detection accuracy is improved, but processing time increases
Solution Approach 1:
The patent segments the symbol sequence into multiple detection ranges, allowing the system to process symbols in manageable chunks rather than handling the entire frame at once. This segmentation reduces the time required for each processing stage while maintaining comprehensive detection capability across all symbols through systematic iteration through different ranges.
Solution Approach 2:
By applying partial action, the patent processes only the necessary subset of symbols within each detection range rather than the complete symbol set. This selective processing significantly reduces processing time while still achieving accurate PN phase detection, as the detection algorithm efficiently identifies phase offsets within the reduced symbol subset.
3Reliability
If full PN phase detection is applied to handle large DTMB payloads, then detection reliability is improved, but computational load increases
Solution Approach 1:
The patent segments the detection process into multiple stages, each handling a specific detection range of symbols. This segmentation allows the system to maintain high detection reliability by systematically evaluating multiple symbol subsets while reducing the computational load at each stage, as each stage processes only a portion of the total symbol set rather than the entire payload at once.
Solution Approach 2:
The patent applies partial action by processing only the necessary subset of symbols required for reliable PN phase detection. This selective processing maintains detection reliability by focusing computational resources on the most critical symbol segments while avoiding the excessive computational load that would result from processing the complete large DTMB payload.
Data Source
AI summary
A method and system for pseudorandom noise (“PN”) phase detection in digital terrestrial multimedia broadcast (“DTMB”) receivers. This method selects a detection range of symbols from a frame of the received signal; applies FFT to the PN portion of each of the symbols in the detection range to generate Hn(k); applies phase rotation to Hn(k) to obtain phase rotated for the PN portion of the symbols in the detection range; applies differential operations to to generate Hpd ; sums the Hpd to generated Hsum; calculates a value Q as a function of Hsum; and determines the PN phase offset as a function of Q and a predefined threshold.