Mobile Receiver Interference Cancellation via Phase Feedback

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In communications systems, especially those using TDMA or FDMA, interference signals degrade the reception ability of receivers due to increased frequency reuse, necessitating effective interference cancellation methods.

Innovation Solution

A method and apparatus for canceling interference in mobile communication systems, involving a transmitter and receiver that determine and manipulate user and interference phase information in complex space to eliminate interference, using a radio frequency unit and controller to transmit and receive feedback information, allowing for interference cancellation through phase rotation and feedback mechanisms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If frequency reuse factor is increased to enhance system capacity, then more user signals can be supported, but interference between user signals increases and degrades reception ability

Engineering Contradiction:

Improvesystem capacityVSAvoidinterference signal

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful interference signal into a beneficial component by using it as input for interference cancellation processing. The receiver extracts interference components from received signals and subtracts them to recover desired signals, thereby transforming the harmful effect of frequency reuse into a manageable parameter that enables higher capacity while maintaining reception quality

Inventive Principle:

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

Solution Approach 2:

The patent implements feedback mechanisms where the receiver processes received signals, identifies interference components, and generates cancellation signals that are fed back to eliminate interference. This closed-loop approach continuously adapts to changing interference conditions, enabling the system to maintain high capacity through dynamic interference management

Inventive Principle:

Principle #23Feedback

2Productivity

If multiple user signals exist in the same wireless channel to increase capacity, then frequency reuse is improved, but mutual interference between signals degrades reception ability

Engineering Contradiction:

Improvefrequency reuseVSAvoidreception ability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the received signal into desired signal components and interference signal components. By separating and independently processing these components, the system can extract and cancel interference while preserving the desired signal, thereby maintaining reliable reception even when multiple user signals occupy the same channel

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary interference cancellation processing unit that acts as a mediator between the received mixed signals and the desired output. This intermediary component extracts interference characteristics and generates cancellation signals, enabling the system to reconcile the conflict between high frequency reuse and reliable reception

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10277359B2Receiver, method for cancelling interference thereof and transmitter for the same

Publication Date: 2019.04.30 SAMSUNG ELECTRONICS CO LTD

AI summary

A method and apparatus for receiving feedback information of a transmitter in a mobile communication system are provided. The method includes determining a parameter related to a first user signal; transmitting the first user signal based on the parameter related to the first user signal to a receiver; and receiving feedback information associated with the first user signal and an interference signal based on the first user signal.