Collaborated Beamforming via Open Window Interference Detection

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Solution Overview

Problem

Current methods for adaptive beamforming in wireless communication systems are inefficient in detecting and suppressing interference, leading to poor signal-to-noise ratios and reduced capacity, especially in frequency reuse scenarios, as they either require high processing costs for comprehensive interference detection or sacrifice data quality by focusing on selected portions of the frequency-time span.

Innovation Solution

The method involves generating frequency-time frames with predetermined open windows to observe interference, calculating beamforming weights based on this information, and aggregating data across multiple frames to reduce processing overhead while capturing comprehensive interference patterns, allowing for optimized antenna array performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional beamforming methods detect interference in the entire frequency-time span, then interference detection completeness is improved, but processing cost and capacity increase

Engineering Contradiction:

Improveinterference detection completenessVSAvoidprocessing cost

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The frequency-time span is segmented into multiple frames with designated open windows. Instead of processing the entire span continuously, the system divides the detection task into discrete frame-based segments, processing only the open window portions where interference occurs, thereby reducing overall processing cost while maintaining detection completeness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system pre-designates open windows in each frame before actual interference detection begins. These pre-planned detection zones are established in advance, allowing the system to focus processing resources only on predetermined interference-prone areas rather than scanning the entire frequency-time span, thus reducing processing cost while ensuring complete interference detection.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If traditional beamforming methods detect interference only in selected portions of frequency-time span, then processing cost is reduced, but data quality is lost due to lack of complete interference picture

Engineering Contradiction:

Improveprocessing costVSAvoiddata quality

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The frequency-time span is divided into multiple frames with open windows strategically positioned to capture interference patterns. This segmentation allows the system to process only the necessary portions (open windows) while maintaining a complete interference picture through the collective information from all frames, thus preserving data quality without excessive processing cost.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system maintains continuous interference detection across multiple frames by repeatedly utilizing open windows in each frame. This continuous sampling of interference patterns over time ensures that the system builds a complete interference picture through accumulated data from multiple cycles, preserving data quality while keeping processing cost manageable through frame-based efficiency.

Inventive Principle:

Principle #20Continuity of useful action

3Productivity

If frequency reuse with N=3 is deployed, then spectrum efficiency is improved, but same-channel interference renders signal-to-noise ratio poor in majority of area

Engineering Contradiction:

Improvespectrum efficiencyVSAvoidsame-channel interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system converts the harmful same-channel interference into useful information by using open windows to observe interference patterns. The interference that would normally degrade signal quality is instead captured and utilized to calculate beamforming weights, transforming the harmful interference into a beneficial resource for improving beamforming performance and suppressing interference in other areas.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The system implements feedback by using the observed interference information from open windows to calculate and update beamforming weights. This feedback loop allows the system to continuously adapt the beamforming parameters based on actual interference conditions, enabling effective interference suppression while maintaining high spectrum efficiency through frequency reuse.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS7680457B2Method and system for collaborated beamforming for reducing interference

Publication Date: 2010.03.16 CISCO TECHNOLOGY INC

AI summary

A method is provided for reducing interferences in a wireless communication system. First, in one or more cells, a plurality of frequency-time frames are generated each having at least one predetermined frequency-time open window unused for desired wireless communications. The interference information is derived from the predetermined open windows of the frames. The interference for incoming signals is reduced by calculating beamforming weights using the observed interference information.