Wake-Up Receiver Oscillator Control for Adjacent Channel Interference

Solution Overview

Problem

Wake-up receivers (WURs) face challenges in handling adjacent channel interference (ACI) due to relaxed frequency generation requirements, which lead to performance degradation and increased power consumption, as they struggle to maintain sensitivity and selectivity while minimizing energy consumption.

Innovation Solution

Adapting the frequency generation quality of the local oscillator arrangement in wake-up radio receivers by selecting from multiple frequency generation qualities, based on estimated tolerable levels, to balance power consumption and ACI handling, using multiple local oscillator circuits or adjusting single circuit characteristics to meet performance targets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If relaxed frequency generation requirements are used in wake-up receivers, then power consumption is reduced, but adjacent channel interference handling capability deteriorates

Engineering Contradiction:

Improvepower consumptionVSAvoidadjacent channel interference

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent applies dynamics by making the frequency generation quality adjustable rather than fixed. The local oscillator arrangement can dynamically switch between different frequency generation qualities (first quality with better performance but higher power consumption, and second quality with relaxed performance but lower power consumption) based on the detected interference conditions. This resolves the contradiction by allowing the system to adapt its resource usage to actual operational needs.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of frequency generation quality based on interference conditions. When adjacent channel interference is detected, the system switches to the first frequency generation quality with better performance characteristics. When interference is absent, it uses the second relaxed quality to minimize power consumption. This parameter adaptation directly resolves the technical contradiction between power efficiency and interference handling.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If multiple frequency generation qualities are implemented, then interference handling capability is improved, but device complexity increases

Engineering Contradiction:

Improveadjacent channel interferenceVSAvoidlocal oscillator arrangement complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent implements multi-functionality by designing a local oscillator arrangement that can provide multiple frequency generation qualities using a unified structural framework. Rather than implementing completely separate oscillator circuits, the system uses a versatile local oscillator arrangement that can operate in different modes or configurations to deliver both high-quality and relaxed-quality frequency generation, thereby reducing overall device complexity while maintaining interference handling capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If frequency generation quality is increased, then wake-up signal detection accuracy is improved, but power consumption increases

Engineering Contradiction:

Improvewake-up signal detection accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the frequency generation quality adjustable rather than fixed. The local oscillator arrangement can dynamically switch between different frequency generation qualities (first quality with better performance but higher power consumption, and second quality with relaxed performance but lower power consumption) based on the detected interference conditions. This resolves the contradiction by allowing the system to adapt its resource usage to actual operational needs.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of frequency generation quality based on interference conditions. When adjacent channel interference is detected, the system switches to the first frequency generation quality with better performance characteristics. When interference is absent, it uses the second relaxed quality to minimize power consumption. This parameter adaptation directly resolves the technical contradiction between power efficiency and interference handling.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11394416B2Radio receiver, method and computer program

Publication Date: 2022.07.19 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A radio receiver comprises a local oscillator arrangement and a controller. The local oscillator arrangement is arranged to provide a signal for down-conversion of radio frequency signal to an intermediate frequency or a baseband frequency in the radio receiver, and the local oscillator arrangement is capable of selectably providing multiple frequency generation qualities. The controller is arranged to estimate a tolerable frequency generation quality for the current operation of the radio receiver or determine whether the current operation of the radio receiver is satisfactory in sense of a currently provided frequency generation quality, and based on the estimation or determination adjust frequency generation quality of the local oscillator arrangement by selecting one of the multiple frequency generation qualities. A radio arrangement, a method and a computer program are also disclosed.