Frequency-Selective Beam Tilt Using Subcarrier IQ Phase Control

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently distributing signals to antenna radiating elements, particularly in achieving frequency-selective electronic beam tilting for specific coverage areas or subsets of subcarriers, which is crucial for optimizing signal transmission and reception.

Innovation Solution

Implementing frequency-selective electronic beam tilting by applying incremental or constant phase rotations, time delays, or combinations thereof, to subcarrier frequency-domain IQ data points, using transceiver ICs to process RF signals and achieve desired radiation patterns for beamforming and antenna tilt.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If frequency-selective electronic beam tilting is implemented using phase rotations and time delays in commonly-processed IQ data, then signal distribution efficiency and coverage optimization are improved, but device complexity and signal processing complexity increase

Engineering Contradiction:

Improvesignal distribution efficiencyVSAvoidsignal processing complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by modifying phase and time delay parameters across different frequency subcarriers. Specifically, incremental phase rotations are applied to commonly-processed IQ data points, where the phase rotation amount varies by subcarrier frequency, enabling frequency-selective beam tilting without requiring separate signal paths for each frequency band

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the frequency spectrum into multiple subcarriers and applies different phase rotation parameters to each subcarrier group. This allows independent beam tilting control for different frequency portions, enabling targeted coverage optimization for specific geographic areas or user groups while maintaining efficient use of commonly-processed IQ data

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If beam tilting is applied to specific component carriers or subcarrier subsets, then coverage area optimization and signal quality for specific users are improved, but manufacturing precision and calibration requirements increase

Engineering Contradiction:

Improvebeamforming precisionVSAvoidcalibration difficulty

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent implements local quality by applying different phase rotation parameters to specific subcarrier subsets within the commonly-processed IQ data. This enables different beam tilting characteristics for different frequency portions, allowing optimization of coverage for specific users or areas while using the same hardware path, thereby reducing calibration complexity compared to fully independent per-element control

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If incremental phase rotation is applied to each subcarrier frequency-domain IQ data point, then frequency-selective beam tilting is achieved, but computational load and processing time increase

Engineering Contradiction:

Improvefrequency-selective beam controlVSAvoidsignal processing time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent achieves universality by processing commonly-processed IQ data that serves multiple frequency components simultaneously. By applying incremental phase rotations in the frequency domain before inverse FFT transformation, a single processing operation achieves beam tilting for multiple subcarriers, reducing redundant computation compared to time-domain processing of each frequency component separately

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Enhances signal distribution efficiency by allowing each carrier or subcarrier to be tilted towards specific coverage areas, improving signal quality and coverage, especially in subarrays of individual transceivers with commonly-processed IQ data.

Implementation Method 1

applying an incremental phase rotation to each subcarrier frequency-domain IQ data point (via, e.g., and NCO), (ii) applying a constant phase rotation to each subcarrier frequency-domain IQ data point (e.g., via a complex multiplication)

Methodology Applied

Scientific EffectPhase rotation:

Implementation Method 2

imposing time delays in the discrete time domain signals of the transmit baseband signals

Methodology Applied

Scientific EffectTime delay:

Implementation Method 3

distributing a plurality of amplified radio frequency signals to a corresponding plurality of antenna radiating elements

Methodology Applied

Scientific EffectElectromagnetic radiation:

Data Source

PatentUS12609743B2Frequency-selective electronic beam tilt

Publication Date: 2026.04.21 INNOPHASE INC

AI summary

Coordinated signal processing at at least a first and second transceiver integrated circuit (IC) configured to commonly process aggregated signal-port IQ data packets; and, each transceiver IC having a transmit signal processing circuit configured to process the commonly-processed aggregated signal-port IQ data packets in accordance with frequency-specific beam-tilt information received in control message packets. The frequency-specific electronic beam tilt may be applied to either a designated component carrier, or to a designated subset of subcarriers within a given component carrier.