Broadcast Signal PAPR Reduction Using Reserved Carriers
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Solution Overview
Problem
Current digital broadcast systems face challenges in data transmission efficiency, robustness, and network flexibility, particularly in handling large amounts of data and ensuring reliable mobile reception.
Innovation Solution
The method involves encoding data using an OFDM scheme, building signal frames with specific components like a preamble, Normal data symbol, and Frame Edge Symbol, and modulating them for transmission, while also incorporating pilot signals and reserved carriers for PAPR reduction, allowing for efficient transmission and reception of multiple broadcast services over the same RF signal bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital broadcast signals transmit large amounts of video/audio data and additional data, then service quality is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent segments data into multiple data pipes (DP0-DP7) with different priorities and characteristics. Each data pipe handles specific types of data (e.g., DP0 for video, DP1 for audio, DP2 for additional data), allowing efficient multiplexing and transmission of large data volumes without overwhelming the transmission system. This segmentation enables parallel processing and optimized resource allocation across multiple channels.
Solution Approach 2:
The patent introduces a hierarchical structure with multiple dimensions: data pipes (DP0-DP7), ensembles (E0-E7), and layers (base layer, enhancement layers). This multi-dimensional organization allows data to be transmitted through different paths and priorities, improving overall transmission efficiency while handling large data volumes. The 3D structure (pipe×ensemble×layer) enables flexible resource allocation and efficient bandwidth utilization.
2Reliability
If robustness of transmission/reception networks is improved for mobile reception equipment, then reception reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies different transmission and reception characteristics to different data pipes and service types. Critical services (e.g., video in DP0) use more robust transmission with higher priority, while less critical services use simpler transmission. This local optimization ensures reliable reception for mobile equipment without requiring all components of the system to be equally complex.
Solution Approach 2:
The patent changes transmission parameters dynamically based on service requirements and channel conditions. Different data pipes use different modulation schemes, coding rates, and priority levels. The system can adapt parameters such as ensemble assignment, data pipe priority, and transmission power to maintain reliable reception in mobile environments while managing device complexity through selective parameter adjustment.
Data Source
AI summary
A method for transmitting broadcast signals by an apparatus for transmitting broadcast signals, the method includes encoding data which is carried by a Data Pipe, DP; bit interleaving the encoded data; Multiple Input Multiple Output, MIMO, processing the bit interleaved data; time interleaving the MIMO processed data; encoding signaling data; building at least one signal frame including signaling symbols having the encoded signaling data and data symbols having the time interleaved data; modulating data of the at least one signal frame by an Orthogonal Frequency Division Multiplex (OFDM) scheme; performing Peak to Average Power Ratio (PAPR) reduction for the modulated data using a tone reservation algorithm based on a Fast Fourier Transform (FFT) size. In addition, sets of reserved carriers for the PAPR reduction are used in the signaling symbols and the data symbols; and transmitting broadcast signals including the PAPR reduction performed data, further a set of reserved carriers for the signaling symbols is different from a set of reserved carriers for the data symbols.