Control Data Scrambling for Lower-PAPR OFDM Demodulation
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Solution Overview
Problem
In digital broadcasting standards like DVB-T.2, the high Peak-to-Average Power Ratio (PAPR) of OFDM signals in T2 frames can lead to signal clipping in reception devices, degrading OFDM signal quality and complicating demodulation processing.
Innovation Solution
A data processing method involving padding control data with dummy data, scrambling the padded data, generating replacement data by replacing scrambled dummy data with dummy data, and performing error correction encoding to improve PAPR and facilitate demodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control data is scrambled to improve PAPR, then PAPR is reduced and signal clipping is prevented, but reception device processing complexity increases due to additional descrambling operations
Solution Approach 1:
The patent applies preliminary action by padding control data with dummy data before scrambling. This preprocessing step ensures that the scrambled data maintains a structure that simplifies reception device processing. The dummy data padding is performed in advance to prevent signal clipping while avoiding the need for complex descrambling operations at the receiver端.
Solution Approach 2:
The patent changes the parameter structure of control data by adding dummy data pads, which modifies the data length and structure. This parameter change allows the control data to be scrambled in a way that reduces PAPR while maintaining compatibility with existing reception device processing workflows, as the overall structure remains predictable.
2Reliability
If control data is scrambled to reduce PAPR, then signal clipping is prevented, but demodulation processing becomes more difficult
Solution Approach 1:
The patent performs preliminary padding of control data with dummy data before scrambling. This preliminary action ensures that the data structure is optimized in advance, allowing scrambling to reduce PAPR without complicating demodulation processing. The reception device can process the scrambled padded data using standard procedures.
Solution Approach 2:
The patent uses dummy data as a copy or placeholder that mimics the structure of actual control data. This copying approach allows the control data to be scrambled and processed without requiring special handling, as the dummy data maintains the expected data format and structure throughout the processing chain.
3Reliability
If control data is scrambled to improve PAPR, then PAPR is reduced, but additional processing operations are required at the reception device
Solution Approach 1:
The patent applies preliminary action by padding control data with dummy data before scrambling. This preprocessing step optimizes the data structure in advance, reducing the need for additional complex processing operations at the reception device. The padding is performed once during transmission preparation, improving overall processing efficiency.
Solution Approach 2:
The patent changes data parameters by adding dummy data pads, which modifies the data structure to enable more efficient scrambling and processing. This parameter change reduces PAPR while maintaining processing efficiency, as the padded structure allows for streamlined operations at both transmission and reception ends.
Data Source
AI summary
A data processing device and a data processing method that can readily process control data having its PAPR improved. In a transmission device, a padder pads control data necessary for demodulation with zeros as dummy data, and a scrambler scrambles the padded control data (post-padding control data). A replacement unit replaces scrambled dummy data in the scrambled post-padding control data with the dummy data, and a BCH encoder and an LDPC encoder perform BCH encoding and LDPC encoding as error correction encoding on the replacement data obtained through the replacement. A shortening unit performs shortening by deleting the dummy data contained in the LDPC code and puncturing the parity bits of the LDPC code. The device can be applied in cases where control data is subjected to error correction encoding and is then transmitted, for example.