60 GHz OFDM LDPC Coding With Sub-Carrier Diversity Mapping
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Solution Overview
Problem
Current communication systems using LDPC codes face challenges in achieving low bit error rates at high data rates due to latency constraints and the need to approach Shannon's limit, particularly in wireless and high-speed Ethernet applications.
Innovation Solution
The development of novel LDPC code constructions with partial tree-like structures and specific parity check matrices, including CSI sub-matrices, to enhance decoding performance and reduce error floors, allowing for efficient error correction in high data rate communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional LDPC codes are used in high data rate communication systems, then data transmission capability is maintained, but bit error rates increase and decoding efficiency decreases due to latency constraints
Solution Approach 1:
The patent segments the LDPC code structure into specific parity check matrices with tree-like structures, dividing the coding process into manageable components that can be decoded more efficiently while maintaining or improving error correction performance
Solution Approach 2:
The patent changes the structural parameters of LDPC codes by introducing specific parity check matrices with tree-like structures and controlled degree distributions, transforming the code properties to achieve both low bit error rates and high decoding efficiency
2Reliability
If LDPC codes are designed to approach Shannon's limit, then error correction performance improves, but system complexity increases due to latency constraints
Solution Approach 1:
The patent applies local quality by designing specific regions of the parity check matrix with tree-like structures and particular degree distributions, creating localized optimal properties that improve error correction performance without requiring complete redesign of the entire code structure
Solution Approach 2:
The patent performs preliminary design of parity check matrices with predetermined tree-like structures and degree distributions before encoding, preparing the code structure in advance to facilitate efficient decoding while approaching Shannon's limit
Data Source
AI summary
LDPC coding systems for 60 GHz millimeter wave based physical layer extension. LDPC (Low Density Parity Check) encoding in cooperation with sub-carrier interleaving, in the context of orthogonal frequency division multiplexing (OFDM), and appropriate symbol mapping is performed in accordance with transmit processing as may be performed within a communication device. In a receiving communication device, receive processing may be performed on a received signal based on the type of LDPC, sub-carrier interleaving, and symbol mapping thereof. The LDPC code employed in accordance with such LDPC encoding may have a partial-tree like structure. In addition, appropriate manipulation of the bits assigned to respective sub-carriers may be performed to ensure that the bits emplaced in the MSB (Most Significant Bit) location of various symbols has some desired diversity (e.g., from different codewords, from appropriately different locations within a given codeword, etc.).