Wireless Unequal Modulation for Spatial Stream SNR Adaptation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless local area network (WLAN) technologies face limitations in adjusting modulation and coding scheme (MCS) settings to channel conditions due to complexity, hardware constraints, and communication overhead, leading to inefficient use of multiple spatial streams with varying signal-to-noise ratios (SNR).
Innovation Solution
Implementing unequal modulation and coding scheme (UEQM) that allows for separate adjustment of forward error correction (FEC) code rates and constellation sizes per spatial stream and carrier, using SNR margins and feedback mechanisms to optimize transmission settings based on individual link quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If equal modulation and coding scheme (MCS) settings are used for all spatial streams, then device complexity is reduced and ease of operation is improved, but transmission efficiency deteriorates due to inability to adapt to varying SNR conditions across different spatial streams
Solution Approach 1:
The patent segments the MCS settings by applying them individually to each spatial stream rather than uniformly across all streams. This allows each spatial stream to have optimized modulation and coding parameters based on its specific SNR conditions, thereby improving transmission efficiency without requiring complete reconfiguration of the entire MIMO system
Solution Approach 2:
The patent implements local quality optimization by allowing different MCS settings for different spatial streams based on their individual channel conditions. Each spatial stream can utilize appropriate modulation order and code rate tailored to its specific SNR characteristics, maximizing the utilization of available channel capacity while maintaining system stability
2Productivity
If separate MCS settings are applied to each spatial stream based on individual SNR conditions, then transmission efficiency is improved, but device complexity increases due to additional adjustment parameters and computation
Solution Approach 1:
The patent employs feedback mechanisms where the receiver measures the SNR of each spatial stream and reports this information back to the transmitter. Based on this feedback, the transmitter automatically selects appropriate MCS settings for each spatial stream, eliminating the need for manual configuration and simplifying operation while achieving optimized throughput
Solution Approach 2:
The patent performs preliminary SNR measurement and MCS selection before actual data transmission. By pre-determining the optimal MCS settings based on channel conditions, the system avoids complex real-time adjustments during transmission, thereby improving ease of operation while maintaining high throughput
3Productivity
If traditional equal MCS settings are used across all spatial streams, then hardware constraints are simplified, but transmission efficiency deteriorates due to loss of adaptive capability to varying channel conditions
Solution Approach 1:
The patent introduces dynamic adaptability by allowing MCS settings to vary across different spatial streams based on their individual channel conditions. This dynamic configuration enables the system to adapt to varying SNR conditions without requiring complex hardware changes, as the adaptation is achieved through software-controlled parameter selection
Data Source
AI summary
An access point (AP) may include a processing device. The processing device may determine, at the AP, one or more unequal modulation settings. The processing device may identify, at the AP, a forward error correction (FEC) code rate for a plurality of spatial streams based on the one or more unequal modulation settings. The processing device may compute, at the AP, one or more constellation sizes for the plurality of spatial streams for transmission to a station (STA) based on the one or more unequal modulation settings.