Mixed-Length LDPC Codewords for High-Payload Wireless Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems using LDPC coding are limited by a fixed set of codeword lengths, which restricts channel gain and efficiency, especially when dealing with high quantities of payload bits.
Innovation Solution
The system performs LDPC coding operations to generate codewords with mixed lengths, including a first longer codeword length and one or more shorter codeword lengths, and arranges these codewords into symbols such that the last symbol includes only shorter codewords, enhancing transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed set of LDPC codeword lengths is used, then device complexity is reduced and ease of operation is improved, but channel gain is limited and transmission efficiency deteriorates
Solution Approach 1:
The patent implements dynamic codeword length selection where the LDPC coding configuration changes based on the quantity of payload bits. The system transitions from a fixed codeword length set to a dynamic selection mechanism that adapts codeword lengths (e.g., 648, 1296, 1944, 2592, 31104 bits) according to transmission requirements, thereby improving transmission efficiency without significantly increasing device complexity
Solution Approach 2:
The patent changes the parameter of codeword length from a fixed set to a variable parameter that can be selected based on payload size. By allowing the codeword length parameter to change dynamically (selecting from multiple predefined lengths), the system optimizes channel gain and transmission efficiency for different data quantities while maintaining manageable device complexity through predefined options
2Device complexity
If the same codeword length is used for multiple codewords, then device complexity is reduced and ease of operation is improved, but channel gain is limited
Solution Approach 1:
The patent applies local quality by assigning different codeword lengths to different codewords based on their specific requirements. Instead of using a uniform codeword length for all codewords, the system selectively applies appropriate codeword lengths (e.g., using longer codewords for some data portions and shorter ones for others) to optimize channel gain for each local transmission context
Solution Approach 2:
The system dynamically selects codeword lengths for different codewords based on the total payload size and transmission conditions. This dynamic approach allows the system to maximize channel gain by adapting codeword lengths in real-time while keeping device complexity manageable through algorithmic selection rather than manual configuration
3Reliability
If longer codewords are used, then channel gain increases and reliability is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent implements a dynamic codeword length selection mechanism that automatically chooses appropriate codeword lengths (from predefined options including longer lengths like 31104 bits) based on payload size and transmission conditions. This dynamic selection improves reliability and channel gain when needed while avoiding unnecessary complexity by not always using the longest codewords
Solution Approach 2:
The system changes the codeword length parameter dynamically based on transmission requirements. By allowing the codeword length parameter to vary between predefined options (including both shorter and longer lengths), the system achieves higher channel gain and reliability when longer codewords are appropriate, while maintaining ease of operation through automated parameter selection
4Productivity
If mixed codeword lengths are used, then transmission efficiency is improved and channel gain increases, but device complexity increases
Solution Approach 1:
The patent implements dynamic codeword length selection that automatically determines the appropriate mix of codeword lengths based on payload size. The system transitions from static uniform codeword lengths to dynamic mixed-length codewords, improving transmission efficiency while managing device complexity through algorithmic determination of codeword arrangements
Solution Approach 2:
The system changes multiple parameters simultaneously - codeword lengths, quantities of codewords, and their arrangements - based on payload size. By coordinating these parameter changes (selecting from predefined length options and determining appropriate quantities), the system achieves improved transmission efficiency while keeping device complexity manageable through systematic parameter management
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first wireless device, such as a wireless station (STA) or a wireless access point (AP), may perform a low-density parity check (LDPC) coding operation on input bits of a set of code blocks. Performing the LDPC coding operation on the input bits may produce a set of codewords including one or more codewords having a first codeword length and one or more codewords having a second, shorter codeword length. The first wireless device may arrange the set of codewords into a set of symbols such that a last symbol in time of the set of symbols includes the one or more codewords each having the second codeword length and no codewords having the first codeword length. The first wireless device may transmit, to a second wireless device, the plurality of symbols.