Interfering Pulse Detection for Spectrum Sharing

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Solution Overview

Problem

Current wireless communication systems face challenges in managing interference from other systems, particularly pulsed radar interference, which severely impacts synchronization, reference symbols, and control signaling, making it difficult to share the same frequency spectrum effectively.

Innovation Solution

A communication unit equipped with detection and processing means to identify and respond to short, strong interfering pulses (SIPs) by determining their presence, predicting future pulses, and taking appropriate actions such as setting affected symbol samples to zero or increasing noise estimates, allowing for continued reliable decoding and spectrum sharing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If spectrum sharing is implemented to increase capacity and data rates, then spectrum utilization efficiency is improved, but interference from other systems increases

Engineering Contradiction:

Improvespectrum utilization efficiencyVSAvoidinterference from other systems

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful effect of strong interfering pulses into useful information by detecting their presence and characteristics. The detection means identifies SIPs, and the processing means uses this information to adjust demodulation and decoding processes, thereby transforming the harmful interference into a manageable parameter that enables coexistence of different systems in the same spectrum.

Inventive Principle:

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

Solution Approach 2:

The patent introduces detection means and processing means as intermediary components between the received signal and the demodulation/decoding process. These intermediaries detect SIPs and facilitate appropriate handling, enabling the system to navigate through interfering pulses without complete signal destruction, thus mediating between the interfering radar system and the mobile communication system.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If strong interfering pulses are present in the system, then interference impact on synchronization and control signaling increases, but system performance deteriorates

Engineering Contradiction:

Improveinterference impact on synchronization and control signalingVSAvoidsystem performance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent applies preliminary action by detecting SIPs before they completely destroy the signal. The detection means identifies the presence of interfering pulses in advance, allowing the processing means to prepare appropriate demodulation and decoding strategies, thereby preventing complete system failure rather than reacting after damage occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies local quality by treating different parts of the received signal differently based on SIP detection. When SIPs are detected, the processing means selectively adjusts demodulation and decoding for affected portions while maintaining normal processing for unaffected portions, thereby preserving system performance locally rather than globally degrading.

Inventive Principle:

Principle #3Local quality

3Device complexity

If conventional interference handling is used treating interference as thermal noise, then system complexity remains simple, but coexistence with other systems becomes virtually impossible

Engineering Contradiction:

Improveinterference handling complexityVSAvoidcoexistence capability with other systems

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by making the interference handling approach adaptive rather than static. The detection means continuously monitors for SIPs, and the processing means dynamically adjusts demodulation and decoding strategies based on real-time detection results. This dynamic adaptation enables the system to switch between normal operation and SIP-handling modes, achieving coexistence with other systems.

Inventive Principle:

Principle #15Dynamics

4Quantity of substance

If short radar pulses interfere with code blocks, then only a small fraction of symbols are affected, but entire code blocks are destroyed

Engineering Contradiction:

Improvefraction of affected symbolsVSAvoidcode block integrity

Core Design Contradiction:

Quantity of substanceVSLoss of information

Solution Approach 1:

The patent applies feedback by using detection means to monitor the received signal for SIPs and providing this information back to the processing means. This feedback loop enables the processing means to adjust demodulation and decoding operations based on actual interference conditions, preventing the propagation of errors that would otherwise destroy entire code blocks despite affecting only a small fraction of symbols.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS8654720B2Spectrum sharing enabled by strong interfering pulse handling

Publication Date: 2014.02.18 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Interference between a communication system operating in a frequency area and another system sending out pulses affecting the frequency area can be handled by means of a communication unit (RBS 1. MT1) for use in a cellular communications system, said communications unit comprising detecting means (10, 20) for determining the presence of at least one interfering pulse from another system affecting the signalling in the cellular communications system, and processing means (11, 21) for selecting and taking appropriate action based on the detected at least one interfering pulse.