UWB LDPC Codeword Length Mapping for Shortening Bit Loss
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Solution Overview
Problem
The challenge in determining the optimal length of an LDPC code word in a UWB system, which affects error control performance, and how to balance this with bit rate loss due to shortening zero bits.
Innovation Solution
A method for determining the length of an LDPC code word in a UWB system based on the length of the to-be-encoded information bit, using specific cases to select from code lengths of 648 bits, 1296 bits, and 1944 bits, and calculating the quantity of shortening zero bits to minimize bit rate loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a longer LDPC code word length is selected, then error control performance is improved, but bit rate loss increases due to more shortening zero bits
Solution Approach 1:
The patent implements dynamic selection of LDPC code word length based on the actual length of to-be-encoded information bits. The communication apparatus adapts the code word length (648, 1296, or 1944 bits) according to the information bit length, rather than using a fixed length. This dynamic adaptation optimizes the balance between error control performance and bit rate efficiency for different data sizes
Solution Approach 2:
The patent changes the parameter of code word length based on the information bit length to resolve the contradiction. By establishing a mapping relationship between information bit length ranges and optimal code word lengths, the system adjusts the code word length parameter dynamically. Additionally, the patent optimizes the number of shortening zero bits parameter to minimize bit rate loss while maintaining error control performance
2Productivity
If a shorter LDPC code word length is selected, then bit rate loss is reduced, but error control performance deteriorates
Solution Approach 1:
The system dynamically adjusts the code word length based on the information bit length to achieve optimal bit rate efficiency while maintaining adequate error control performance. For different data sizes, the system selects the most appropriate code word length from available options, avoiding unnecessary performance loss from overly long codes
Solution Approach 2:
The patent optimizes the code word length parameter according to the information bit length to maximize bit rate efficiency. By establishing optimal mapping relationships between information bit length ranges and code word lengths, the system ensures that the code word length parameter is appropriately adjusted to minimize bit rate loss while maintaining required error control performance levels
Data Source
AI summary
This application relates to a method for determining a length of an low-density parity-check (LDPC) code word in a ultra-wideband (UWB) system and a related apparatus. The method includes a communication apparatus that determines a length of an LDPC code based on a length of a to-be-encoded information bit. When the length of the information bit ranges from 0 to 324, a 648-bit LDPC code is selected. When the length of the information bit ranges from 325 to 648 or from 973 to 1296, a 1296-bit LDPC code is selected. When the length of the information bit ranges from 649 to 972, a 1944-bit LDPC code is selected. According to embodiments of this application, higher performance gain can be achieved.