Leech Lattice Transceiver Coding for Low-Latency 100 Gbps Links
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Solution Overview
Problem
Conventional cable interconnects face challenges in achieving high-speed data transmission with low latency and high spectral efficiency, particularly in applications like Storage Area Networks and High Performance Computing, due to limitations in bandwidth and complexity of modulation schemes.
Innovation Solution
The use of transceiver devices with processors that generate constellations of modulated points using concatenated leech lattices with binary and non-binary codes, enabling efficient coding gain and high-speed transmission over reduced twinax cable pairs with low latency and high spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If baseband digital communication is used to achieve low latency and low power dissipation, then power efficiency is improved, but media analog bandwidth capacity is limited
Solution Approach 1:
The patent changes the fundamental parameter of signal representation by mapping baseband digital signals onto a leech lattice constellation structure. This transformation allows the system to achieve higher spectral efficiency (approximately three bits per Hertz) while maintaining the low latency characteristics of baseband communication, effectively resolving the bandwidth-capacity tradeoff
2Speed
If complex modulation schemes are used to increase bandwidth capacity, then data rate is improved, but system complexity and latency increase
Solution Approach 1:
The patent segments the complex modulation problem into manageable components by using a leech lattice structure that can be decomposed into smaller sub-lattices. This segmentation allows for efficient encoding and decoding algorithms that reduce computational complexity while maintaining high data rates, avoiding the latency penalties associated with sophisticated coding techniques
Solution Approach 2:
The patent transitions from traditional two-dimensional QAM constellations to a higher-dimensional leech lattice structure. This dimensional expansion enables more efficient packing of signal points, achieving higher spectral efficiency without proportionally increasing system complexity, as the lattice structure provides mathematical properties that simplify processing
3Productivity
If traditional coding schemes are used to achieve high data rates, then bandwidth utilization is improved, but spectral efficiency is limited
Solution Approach 1:
The patent creates a composite communication scheme by combining leech lattice geometry with traditional error correction codes. This composite approach integrates the spectral efficiency benefits of lattice-based modulation with the reliability of conventional coding, achieving approximately three bits per Hertz while maintaining robust error protection
Data Source
AI summary
A transceiver architecture can contain an encoder and a decoder for communicating high speed transmissions. The encoder can modulate signal data for being mapped in a constellation that is generated based on concatenations of a leech lattice having binary and non-binary codes. The data can be transmitted at a high speed according to the constellation with an embedded leech lattice configuration in order to generate a coding gain. A decoder operates to decode the received input signal data with a decreased latency or a minimal latency with a high spectral efficiency.