Wi-Fi LDPC Codeword Signaling for 2×1944 PPDU Encoding
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Solution Overview
Problem
The need for a method to select and signal 2×1944 low-density parity-check (LDPC) codes in next-generation Wi-Fi systems, as codeword length selection and signaling methods for these codes have not been defined.
Innovation Solution
Proposed schemes for selecting and signaling 2×1944 LDPC codes based on available bits in a physical-layer protocol data unit (PPDU), including LDPC coding and transmission, with options for codeword length determination and LDPC mode indication in the User Specific field of a PPDU.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 2×1944 LDPC codes are used in next-generation Wi-Fi, then LDPC performance is enhanced, but codeword length selection and signaling methods are undefined
Solution Approach 1:
The patent applies parameter changes by systematically varying codeword length parameters (1944, 2×1944, 4×1944) and signaling parameters (2-bit, 3-bit fields) to optimize LDPC performance while maintaining defined selection methods. This resolves the contradiction by establishing clear parameter relationships that enhance reliability without leaving selection methods undefined.
Solution Approach 2:
The patent implements dynamics by enabling flexible, adaptive codeword length selection based on available bits (Navbits) and data requirements (Npld). The system dynamically chooses between 1944, 2×1944, and 4×1944 codeword lengths and activates 2×LDPC mode when beneficial, transforming a static, undefined selection process into a dynamic, performance-optimized mechanism.
2Reliability
If longer LDPC codes (2×1944 or 4×1944) are proposed, then LDPC performance is further enhanced, but codeword length selection criteria are not established
Solution Approach 1:
The patent applies self-service by enabling the system to automatically select appropriate codeword lengths based on inherent parameters (Navbits, Npld) without requiring external configuration or complex external control. The selection process serves itself by using available system state information to determine optimal coding parameters, enhancing ease of operation while maintaining performance enhancement.
Solution Approach 2:
The patent implements feedback mechanisms through signaling fields that provide information about codeword length selection and 2×LDPC mode status to receiving devices. This feedback enables coordinated operation and ensures that performance enhancements from longer codes are realized through proper system-wide awareness and adaptation.
3Productivity
If 2×LDPC mode is introduced, then communication efficiency is improved, but signaling complexity increases
Solution Approach 1:
The patent applies universality by designing signaling fields that serve multiple functions: indicating codeword length selection, signaling 2×LDPC mode status, and providing information about available bits and data requirements. This multi-functionality reduces the need for separate dedicated signaling mechanisms, improving communication efficiency while managing signaling complexity through consolidated field usage.
Data Source
AI summary
Techniques pertaining to enabling and signaling 2×1944 low-density parity-check (LDPC) codes in next-generation Wi-Fi in wireless communications are described. A wireless communication apparatus (e.g., a station (STA)) selects a codeword length based at least in part on a number of available bits associated with a data portion in a physical-layer protocol data unit (PPDU). The apparatus generates the PPDU by performing LDPC coding with the selected codeword length. The apparatus then transmits the PPDU in a wireless communication.