Digital Broadcast Control Signaling With Split LDPC Codewords
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Solution Overview
Problem
In wireless communication systems, especially digital broadcasting, a significant number of dummy bits are used during encoding of control information, leading to inefficient use of communication resources.
Innovation Solution
The method involves generating coded blocks by efficiently encoding control information using Low Density Parity Check (LDPC) coding, distinguishing between types of control information, and transmitting/receiving these blocks in a digital broadcasting system, where the first coded block has a fixed number of bits and the second coded block has a variable number of bits, with the first block indicating the FEC type for the second block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control information is encoded using conventional methods, then the transmission can be performed with simple encoding, but a large number of dummy bits are used leading to inefficient resource utilization
Solution Approach 1:
The control information is segmented into multiple types (first type and second type) with different characteristics. The first type contains static and configurable information that benefits from fixed-length encoding, while the second type contains dynamic information that requires variable-length encoding. This segmentation allows each segment to be encoded optimally for its specific requirements, reducing overall dummy bit usage.
Solution Approach 2:
The encoding scheme dynamically adapts to the content of control information by using fixed-length encoding for the first type and variable-length encoding for the second type. The receiver uses the indication information from the first coded block to determine the length of the second coded block, enabling dynamic resource allocation that matches actual information requirements rather than using static fixed-length encoding for all cases.
2Productivity
If fixed-length coding is used for all control information, then the transmitter and receiver structures are simplified, but variable information cannot be efficiently encoded without excessive dummy bits
Solution Approach 1:
Control information is divided into two distinct types with different encoding approaches. The first type (static and configurable information) uses fixed-length encoding to maintain structural simplicity, while the second type (dynamic information) uses variable-length encoding to achieve encoding efficiency. This segmentation allows the system to benefit from both simple and efficient encoding where appropriate.
Solution Approach 2:
Different encoding qualities are applied to different parts of the control information based on their specific requirements. The first type of control information receives fixed-length encoding with consistent structure, while the second type receives variable-length encoding optimized for its specific content. This local differentiation optimizes overall system performance without requiring complete structural complexity throughout.
3Loss of substance
If variable-length coding is used for all control information, then dummy bit usage is reduced, but the transmitter and receiver structures become more complex
Solution Approach 1:
The control information is segmented so that only the necessary portion (second type with dynamic information) uses variable-length encoding, while the first type uses fixed-length encoding. This selective application of variable-length encoding reduces dummy bits only where needed, rather than applying it universally which would increase complexity across the entire system.
Solution Approach 2:
Variable-length encoding is applied locally to the second type of control information where it is most beneficial, while the first type maintains fixed-length encoding for structural simplicity. The receiver uses indication information from the first coded block to locally adapt to the variable length of the second block, minimizing the propagation of complexity throughout the system.
4Productivity
If separate encoding is used for different types of control information, then encoding efficiency is improved, but the processing complexity increases
Solution Approach 1:
The first coded block containing indication information about the second coded block's characteristics is encoded and transmitted first. This preliminary action allows the receiver to prepare for the subsequent variable-length decoding by knowing the expected length and structure in advance, reducing the actual processing complexity during the main decoding operation.
Solution Approach 2:
The first coded block serves as an intermediary that carries indication information about the second coded block. This intermediary provides the receiver with necessary metadata (length, structure) before the main data arrives, facilitating more efficient processing of the second block without requiring complex real-time analysis.
Data Source
AI summary
A method and an apparatus are provided for transmitting and receiving signaling information in a digital broadcasting system. First signaling information for a physical layer is encoded to generate a first coded block. Second signaling information is encoded to generate a second coded block. A frame including the first coded block, the second coded block and at least one physical layer pipe (PLP) data is transmitted. The first signaling information has a fixed number of bits. The second signaling information has a variable number of bits. The first signaling information includes information indicating a forward error correction (FEC) type of the second signaling information for receiving the second information. The second signaling information includes information indicating an FEC type used for a related PLP data.