Interference Cancellation via Packet Segmentation in ZIF Receivers

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Solution Overview

Problem

The current solution for interference cancellation in zero intermediate frequency (ZIF) architecture requires hardware circuits in both transmitting and receiving devices, increasing costs and power consumption.

Innovation Solution

An interference cancellation method that uses a first packet with distinct groups of elements to enable interference cancellation in user data at a receiving device without the need for hardware circuits, utilizing spatial mapping and interference cancellation coefficients.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If hardware circuits are disposed in both transmitting and receiving devices for interference cancellation, then interference signals can be canceled, but costs and power consumption increase

Engineering Contradiction:

Improveinterference cancellation capabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent replaces hardware circuits with software-based processing. The transmitting device uses a processor to generate first and second packets with different groups of elements, and the receiving device uses a processor to perform interference cancellation calculations based on these packets, eliminating the need for dedicated hardware interference cancellation circuits in both devices.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent creates virtual representations of interference signals through packet structures. By transmitting multiple packets with different element groups that represent the same underlying signal plus interference, the system enables the receiver to compute and subtract interference without requiring specialized hardware, using instead computational copies of the signal paths.

Inventive Principle:

Principle #26Copying

2Reliability

If hardware circuits are disposed in both transmitting and receiving devices for interference cancellation, then interference signals can be canceled, but device costs increase

Engineering Contradiction:

Improveinterference cancellation capabilityVSAvoidhardware circuit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent makes general-purpose processors perform specialized interference cancellation functions. Instead of requiring dedicated hardware circuits, the processor executes software algorithms that can handle interference cancellation for different packet structures and configurations, making the system more versatile and reducing hardware complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If hardware circuits are disposed in both transmitting and receiving devices for interference cancellation, then interference signals can be canceled, but the structure becomes more complex

Engineering Contradiction:

Improveinterference cancellation capabilityVSAvoiddevice structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Device complexity

If standard packet transmission is used without interference cancellation, then device complexity is low, but user data reception accuracy deteriorates due to interference signals

Engineering Contradiction:

Improvedevice structureVSAvoiduser data reception accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent segments the transmitted signal into multiple distinct components (first packet with first group of elements, second packet with second group of elements). This segmentation allows the receiver to separate and analyze different signal paths independently, enabling accurate interference cancellation while maintaining simple device structures that process these segmented signals through standard software algorithms.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12267698B2Interference cancellation method, apparatus, and system

Publication Date: 2025.04.01 HUAWEI TECH CO LTD

AI summary

In an embodiment an interference cancellation method includes generating, by a first device, a first packet, wherein the first packet comprises a first group of elements, a second group of elements, and user data, the first group of elements being different from the second group of elements and sending, by the first device, the first packet to a second device by using at least one pair of subcarriers, wherein two subcarriers in the at least one pair of subcarriers are symmetrical with respect to a direct current subcarrier, and wherein the first packet is usable by the second device to cancel interference in the user data based on the first group of elements and the second group of elements.