Secondary Network Modulation Classifier for Spectrum Sharing
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Solution Overview
Problem
Existing wireless networks face challenges in efficiently sharing radio frequency spectrum due to limited information exchange between networks, leading to coarse resolution in estimating interference and signal-to-interference-plus-noise ratio, which restricts effective spectrum sharing.
Innovation Solution
Implementing a modulation classifier and throughput estimator in secondary network nodes to estimate the modulation scheme and adaptive modulation and coding configuration of primary networks without direct information exchange, allowing precise control of transmit power to maintain target throughput levels and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If nodes access control channels of other networks to acquire link quality information, then measurement precision of interference effect is improved, but device complexity and network integration requirements worsen
Solution Approach 1:
The secondary network performs self-characterization by autonomously estimating the primary network's link quality and modulation scheme through signal analysis, without requiring access to primary network control channels or explicit information exchange. The secondary network's nodes independently characterize the primary network's transmission characteristics using received signals, enabling interference estimation without external cooperation.
Solution Approach 2:
The patent uses signal analysis of received wireless signals as an intermediary to infer primary network transmission characteristics. Instead of directly accessing control channels, the secondary network analyzes the modulated signals themselves to extract modulation scheme and link quality information, serving as an indirect measurement channel that avoids direct network integration requirements.
2Ease of operation
If networks use a small number of modulation schemes for transmission adaptation, then ease of operation is improved, but measurement precision of interference effect worsens
Solution Approach 1:
The system implements feedback mechanisms where secondary network nodes continuously monitor received signals, estimate modulation schemes and link quality, and adjust their transmission parameters accordingly. This feedback loop enables precise interference estimation by observing the actual impact on primary network transmissions, allowing fine-grained control despite using a limited set of modulation schemes.
Solution Approach 2:
The patent employs dynamic adaptation where the modulation scheme and transmission parameters are adjusted in real-time based on estimated link quality and interference conditions. The system dynamically switches between modulation schemes and adjusts power levels to maintain optimal performance, enabling precise interference measurement through continuous adaptation rather than static configuration.
Data Source
AI summary
A wireless communication system and method for allowing two or more wireless networks to operate simultaneously in the same geographical area and through the same radio frequency (RF) spectrum band includes a plurality of wireless networks each network having at least one radio frequency (RF) transmitting node, capable of estimating the effect of its transmission on another, separate, wireless network of the plurality of wireless networks, each transmitting node having a modulation classifier that estimates from a received wireless signal, a modulation scheme used in the transmission of a wireless link that is received in the highest power in a secondary network of the plurality of wireless networks; and a throughput estimator which predicts, without the need to exchange information between a primary and secondary networks of the plurality of wireless networks, the adaptive modulation and coding configuration for the primary link that is received with highest power at the secondary network transmitting node. The transmitting node in the secondary network maintains the change in the primary network relative average throughput within a prescribed target maximum value, while at the same time finding transmit settings for its transmission that will result in as large throughput as allowed by a primary network interference limit.