LDPC Codeword Length Selection for Wider-Bandwidth WLAN Encoding
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Solution Overview
Problem
Existing wireless networks face challenges in achieving higher bandwidth operation due to limitations in Low-Density Parity Check (LDPC) codeword lengths, which affect error correction and data transmission efficiency.
Innovation Solution
The introduction of increased LDPC codeword lengths, such as 3888 and 7776 bits, in wireless communication standards like IEEE 802.11bn, along with updated encoding mechanisms, to enhance error correction and support higher bandwidth operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional LDPC codeword lengths (648, 1296, 1944 bits) are used, then encoding complexity is manageable, but bandwidth operation and error correction performance are limited
Solution Approach 1:
The patent extends the LDPC codeword length parameter from traditional values (648, 1296, 1944 bits) to longer values (3888, 7776 bits), enabling higher bandwidth operation and improved error correction performance while maintaining compatibility with existing LDPC encoding frameworks
Solution Approach 2:
The patent segments the longer codewords into multiple shorter codewords for transmission, then reassembles them at the receiver. This approach manages encoding complexity by reusing existing shorter-length LDPC encoding mechanisms while achieving the benefits of longer codeword lengths for improved reliability and bandwidth
2Productivity
If longer LDPC codeword lengths (3888, 7776 bits) are introduced, then bandwidth operation and coding gain are enhanced, but encoding and decoding complexity increases
Solution Approach 1:
The patent divides longer codewords (3888, 7776 bits) into multiple shorter codewords that can be encoded using existing LDPC encoding mechanisms, thereby achieving higher data transmission efficiency without requiring completely new encoding hardware or algorithms
Solution Approach 2:
The patent creates a universal encoding framework that can handle multiple codeword lengths (648, 1296, 1944, 3888, 7776 bits) using the same base encoding mechanism, allowing the system to adapt to different bandwidth requirements while maintaining consistent complexity characteristics
3Adaptability or versatility
If updated encoding mechanisms are implemented, then support for higher bandwidth operations is achieved, but compatibility with existing standards may be reduced
Solution Approach 1:
By segmenting longer codewords into shorter units that conform to existing IEEE 802.11 standards, the patent enables higher bandwidth operations while maintaining compatibility with legacy encoding and decoding implementations
Solution Approach 2:
The patent performs preliminary segmentation and encoding of longer codewords into shorter standardized units before transmission, allowing existing standard-compliant devices to process the data without requiring full standard updates, thereby gradually introducing enhanced capabilities
Data Source
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AI summary
An apparatus and method of encoding Low-Density Parity Check (LDPC) Physical Layer Convergence Protocol (PLCP) packet protocol data units (PPDU) is disclosed. For LDPC codeword of lengths 3888 and/or 7776, the number and length of codewords to use may depend on the number of available bits. In this case, if the number of available bits is larger than 1944 and less than 2596, two codewords of length 1944 or a single codeword of length 3888 to encode the PPDU is used to encode the PPDU. For larger numbers of available bits, one or more codewords of length 3888 or 7776 is used to encode the PPDU. Shortening and/or puncturing, when used, is also based on the number of available bits.