mmWave LDPC Coding With 1248-Bit Punctured Codewords
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Solution Overview
Problem
Current wireless communication systems in the millimeter-wave band face challenges in achieving high data transmission rates and efficient communication due to limitations in existing LDPC code implementations, particularly in supporting advanced encoding rates like 7/8 and higher data rates required for next-generation networks.
Innovation Solution
The implementation of an LDPC code with an extended codeword length of 1248 bits and an encoding rate of 7/8, achieved through a puncturing procedure applied to an initial LDPC code, which allows for improved performance with QPSK, 16QAM, 64QAM, and 256QAM modulations, and channel bonding techniques, supporting data rates up to 30 Gbps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If legacy LDPC codes with shorter codeword lengths are used, then hardware complexity is reduced, but data transmission rates are limited and cannot achieve 30 Gbps or higher
Solution Approach 1:
The extended LDPC code with 1248-bit codeword length is segmented into multiple 672-bit codewords through puncturing. This allows the system to achieve higher data rates by transmitting more information bits while maintaining compatibility with existing hardware that was designed for shorter codeword lengths, thus resolving the contradiction between transmission rate and hardware complexity
Solution Approach 2:
The invention changes the codeword length parameter from traditional shorter lengths (e.g., 672 bits) to an extended length of 1248 bits. This parameter change enables higher data transmission rates while the puncturing procedure ensures that the extended code can still be decoded using hardware designed for shorter codes, thereby achieving high rates without proportionally increasing hardware complexity
2Productivity
If LDPC codes with extended codeword length of 1248 bits are implemented, then data rates up to 30 Gbps are achieved, but encoding and decoding complexity increases
Solution Approach 1:
The puncturing procedure extracts and removes specific parity bits from the extended 1248-bit LDPC codeword, creating a shortened transmitted codeword. This extraction allows the system to achieve high data rates by transmitting more data bits while removing redundant parity bits, thereby reducing encoding and decoding complexity compared to transmitting the full extended codeword
Solution Approach 2:
The puncturing pattern is predetermined and applied before transmission. By pre-defining which bits to puncture based on the lifting index and other parameters, the system prepares the extended codeword in advance, simplifying the real-time encoding and decoding operations while maintaining the ability to achieve high data rates
3Productivity
If advanced modulation schemes (256QAM, 1024QAM) are used to increase data rates, then throughput is improved, but error rate increases and communication reliability deteriorates
Solution Approach 1:
The invention combines advanced modulation schemes (256QAM, 1024QAM) with extended LDPC coding to create a composite communication system. The extended LDPC code provides stronger error correction capability that compensates for the increased error susceptibility of high-order modulation, thereby maintaining reliability while achieving high throughput
Solution Approach 2:
The system dynamically changes modulation and coding parameters based on channel conditions. By adjusting the LDPC code rate and modulation order, the system can achieve high throughput when channel conditions are good while maintaining reliability through adaptive parameter selection, resolving the contradiction between throughput and error rate
Data Source
AI summary
Some demonstrative embodiments include apparatus, system and method of communicating a transmission encoded according to a Low-Density Parity-Check (LDPC) code. For example, an apparatus may include logic and circuitry configured to cause a wireless station to encode a plurality of data bits into a plurality of codewords according to an LDPC code having an encoding rate of 7/8 and a codeword length of 1248 bits; and to transmit a transmission over a millimeter Wave (mmWave) frequency band based on the plurality of codewords.