Beamforming Power Control Under Radiated Spectral Density Limits

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Solution Overview

Problem

Regulatory bodies require devices with radio equipment to comply with effective radiated power spectral density limits, which can negatively impact communication capabilities.

Innovation Solution

A computing device with multiple antennas determines maximum transmit levels for each phase difference to comply with regulatory limits, uses beamforming feedback to optimize signal transmission, and adjusts phase differences based on path obstructions for optimal signal power.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If devices are configured to comply with regulatory limits on effective radiated power spectral density, then regulatory compliance is achieved, but the ability of devices to communicate with receiver devices is negatively impacted

Engineering Contradiction:

Improveregulatory complianceVSAvoidsignal power

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The patent implements dynamic adjustment of transmit power levels based on detected propagation conditions. The system continuously monitors channel characteristics and adapts power settings in real-time, transitioning from static regulatory-compliant power levels to dynamic power management that optimizes communication performance while maintaining compliance where necessary.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes physical parameters of signal transmission by adjusting power spectral density across different frequency subcarriers and spatial directions. By modifying transmission parameters such as power allocation, beamforming weights, and phase differences, the system achieves both regulatory compliance and improved communication effectiveness.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If uniform power transmission is used across all antennas, then implementation is simple, but communication efficiency is reduced due to inability to account for path obstructions

Engineering Contradiction:

Improvetransmission simplicityVSAvoidcommunication efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent applies different power levels and transmission characteristics to different antennas and frequency subcarriers based on local channel conditions. Each antenna element and frequency resource is optimized independently according to its specific propagation environment, allowing the system to account for spatial variations and obstructions while maintaining manageable complexity through structured optimization.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The transmission signal is divided into multiple frequency subcarriers and spatial streams, each processed independently with optimized power allocation. This segmentation allows the system to address different propagation paths and obstructions separately, improving overall communication efficiency while maintaining implementation feasibility through modular processing.

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Ensures compliance with regulatory limits while maximizing signal power and communication efficiency by dynamically adjusting phase differences based on beamforming feedback.

Implementation Method 1

Methodology Applied

Scientific EffectBeamforming:

Data Source

PatentUS12574857B2Systems and methods for optimizing signal power

Publication Date: 2026.03.10 COMCAST CABLE COMM LLC

AI summary

Methods and systems for optimizing received signal power and/or physical layer (PHY) rate are disclosed. A first device comprising a plurality of antennas associated with a plurality of phase differences may cause sending of a plurality of signals to a second device. Data indicating a first phase difference of the plurality of phase differences may be received from the second device. Based on the first phase difference, it may be determined that a line of sight (LOS) path between the first device and the second device is unobstructed. Based on determining that the LOS path between the first device and the second device is unobstructed, a transmit power associated with the first phase difference may be determined.