OFDM Preamble Time-Interleaving for Robust Broadcast Reception
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Solution Overview
Problem
The increasing demand for higher definition video and audio signals in digital broadcasting systems, such as DVB-C2, requires improved data transmission efficiency to accommodate more channels and larger data sizes, which existing technologies struggle to meet due to limitations in error correction and signal robustness.
Innovation Solution
A method and apparatus for transmitting and receiving broadcasting signals using Orthogonal Frequency Division Multiplexing (OFDM) with time-interleaving and specific header insertion, allowing for efficient encoding, modulation, and decoding of signals to enhance data transmission efficiency and robustness against noise and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-interleaving is applied to preamble data in OFDM signals, then robustness against frequency selective interference and burst errors is improved, but device complexity increases due to additional processing requirements
Solution Approach 1:
The preamble data is divided into multiple segments that are interleaved across different OFDM symbols. The time-interleaving process separates contiguous data blocks into distributed segments across time, which protects against burst errors by ensuring that errors affecting one segment do not concentrate on adjacent data elements.
Solution Approach 2:
The patent extends the interleaving operation from the frequency domain to the time domain by distributing preamble data across multiple OFDM symbols. This temporal dimension adds redundancy against frequency selective fading and interference, as errors in one time-frequency region do not necessarily affect all data representations.
2Productivity
If higher definition video and audio signals are transmitted, then data transmission capacity requirements increase, but existing error correction and signal robustness mechanisms become insufficient
Solution Approach 1:
The patent combines multiple error correction codes (BCH and LDPC) in a hierarchical structure where BCH provides inner code protection and LDPC provides outer code protection. This merged coding approach achieves higher overall error correction capability than either code alone, enabling reliable transmission of high-definition content.
Solution Approach 2:
The error correction system uses a composite coding structure combining different types of codes with complementary strengths. The BCH code handles certain error patterns while LDPC handles others, creating a composite protection mechanism that is more robust than single-code solutions, analogous to using composite materials for enhanced performance.
Data Source
AI summary
The present invention relates to a method of transmitting and a method of receiving signals, and corresponding apparatus. One aspect of the present invention relates to a method of obtaining a field for indicating a time de-interleaving depth from a layer 1 (L1) header of preamble symbols.