OFDM Synchronization Byte Positioning Using TPS Frame Detection
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Solution Overview
Problem
Conventional OFDM communication systems face challenges in detecting synchronization bytes efficiently, leading to complex hardware requirements and potential time delays, especially in DVB-T standards, where existing methods either require extensive calculations or wait for the first byte of a super frame, resulting in delays.
Innovation Solution
A synchronization method that extracts parameter signals from received OFDM symbols to determine frame and symbol numbers, allowing for the calculation and alignment of synchronization bytes without relying on correlation arithmetic, thereby reducing incorrect detection and aligning subsequent synchronization bytes without waiting for the initial super frame byte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the correlation method is used to detect SYNC byte, then detection flexibility is improved, but hardware complexity increases and incorrect detection may occur
Solution Approach 1:
The patent extracts the SYNC byte detection from the complex correlation arithmetic process by utilizing the predetermined position relationship between TPS bits and SYNC bytes. Instead of performing full correlation matching, the system only needs to extract TPS information and calculate the expected SYNC byte position, significantly simplifying the hardware requirements while maintaining detection accuracy.
Solution Approach 2:
The patent performs preliminary extraction of TPS (Transmission Parameter Signal) information before SYNC byte detection. By obtaining frame number and symbol number from TPS bits in advance, the system can calculate the precise position of SYNC bytes ahead of time, avoiding the need for complex real-time correlation arithmetic and reducing hardware complexity.
2Reliability
If the first byte of super frame is used to identify SYNC byte, then detection reliability is improved, but time delay increases
Solution Approach 1:
The patent performs preliminary extraction of TPS information and calculation of SYNC byte positions before actually detecting the SYNC byte. By using the predetermined relationship between TPS bits and SYNC byte positions, the system can identify SYNC bytes in subsequent frames without waiting for the first byte of super frame, significantly reducing time delay while maintaining reliable detection through the deterministic position calculation.
3Reliability
If multiple SYNC bytes are processed to reduce incorrect detection, then detection reliability is improved, but time delay increases
Solution Approach 1:
The patent performs preliminary calculation of SYNC byte positions based on TPS information before detection. By knowing the exact position of SYNC bytes in advance through mathematical calculation rather than sequential searching or processing multiple candidates, the system achieves reliable detection without the time penalty of processing multiple potential SYNC byte locations.
Solution Approach 2:
The patent replaces the mechanical approach of processing multiple SYNC byte candidates with a computational approach using predetermined position relationships. Instead of physically examining multiple bytes to identify SYNC bytes, the system uses mathematical calculation based on TPS parameters to directly determine SYNC byte positions, eliminating unnecessary processing time.
Data Source
AI summary
A synchronization method and related apparatus of an OFDM digital communication system are disclosed for determining a position of a synchronization byte in a received signal. The method includes extracting a transmission parameter signal (TPS) from the received signal, determining a symbol number and a frame number corresponding to a symbol according to the TPS, and determining the position of the synchronization byte according to the frame number and the symbol number.