MCS Table Layout for Non-Gaussian Channel Transitions
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Solution Overview
Problem
Conventional MCS table designs optimized for Gaussian channels, such as AWGN, are ineffective for non-Gaussian channels like fading and MIMO channels, leading to degraded throughput and complexity at modulation order transitions.
Innovation Solution
Design MCS tables with entries that have non-increasing or equal spectral efficiency for different modulation orders, and optionally use multiple tables tailored for Gaussian and non-Gaussian channels, selecting based on channel conditions or device capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional MCS tables optimized for Gaussian channels are used, then spectral efficiency is maximized for AWGN channels, but throughput and reliability deteriorate for non-Gaussian channels
Solution Approach 1:
The patent changes the parameters of the MCS table by allowing non-monotonic spectral efficiency ordering. Specifically, it defines MCS tables where consecutive entries do not necessarily have increasing spectral efficiency, which fundamentally alters how modulation orders are selected for non-Gaussian channels while maintaining compatibility with existing ACM frameworks
Solution Approach 2:
The patent introduces dynamic MCS table selection based on channel conditions. The system can switch between different MCS tables (e.g., first MCS table for certain channel conditions, second MCS table for other conditions) to optimize performance across varying channel characteristics without requiring complete redesign
2Productivity
If MCS table entries have monotonically increasing spectral efficiency, then data rate is maximized for Gaussian channels, but decoding complexity increases at modulation order transitions
Solution Approach 1:
The patent inverts the conventional approach by allowing spectral efficiency to decrease or remain constant between consecutive MCS entries rather than requiring monotonic increase. This inversion specifically targets transition points between modulation orders to reduce decoding complexity while maintaining acceptable data rates
3Productivity
If higher modulation orders are used, then spectral efficiency increases, but error rates increase without sufficient error coding
Solution Approach 1:
The patent changes the parameter relationship between modulation order and coding rate by allowing the coding rate to decrease when modulation order increases, rather than maintaining a fixed or increasing coding rate. This creates a trade-off that optimizes the balance between spectral efficiency and error correction capability for non-Gaussian channels
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that support modulation and coding scheme (MCS) table design for non-Gaussian channels. In a first aspect, a method of wireless communication performed at a wireless communication device includes encoding information in accordance with a channel code rate selected from MCS data to generate encoded information. The MCS data represents a MCS table having at least one pair of entries that correspond to different modulation orders and for which a spectral efficiency associated with an entry having a higher modulation order is less than or equal to a spectral efficiency associated with an entry having a lower modulation order. The method further includes transmitting the encoded information to a second wireless communication device. Other aspects and features are also claimed and described.