Adaptive Local Oscillator Quality for Wake-Up Receiver ACI Handling
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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 usage.
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.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the local oscillator arrangement uses relaxed frequency generation quality to minimize power consumption, then energy usage is reduced, but adjacent channel interference handling capability deteriorates
Solution Approach 1:
The local oscillator arrangement dynamically adjusts its frequency generation quality based on operational conditions. The system can switch between multiple frequency generation qualities (first quality with lower power consumption and second quality with higher power consumption and better ACI performance), making the oscillator adaptive rather than static. This resolves the contradiction by allowing the system to use relaxed frequency generation quality during normal operation to save power, while switching to higher quality when ACI conditions require it.
Solution Approach 2:
The invention changes the frequency generation quality parameter of the local oscillator based on estimated tolerable levels. By adjusting this critical parameter, the system can optimize the balance between power consumption and ACI handling capability. The controller estimates the tolerable frequency generation quality and adjusts the oscillator parameters accordingly, allowing the system to operate at minimal power consumption while maintaining adequate ACI performance.
2Use of energy by moving object
If the local oscillator arrangement uses relaxed frequency generation quality, then power consumption is reduced, but signal selectivity deteriorates
Solution Approach 1:
The system dynamically adjusts frequency generation quality to match operational requirements. During normal operation with low ACI, the oscillator uses relaxed quality settings to minimize power consumption. When ACI conditions are detected or tolerable quality levels indicate need for better performance, the system switches to higher quality frequency generation, thereby maintaining signal selectivity only when necessary rather than continuously.
Solution Approach 2:
The frequency generation quality parameters are adjusted based on estimated tolerable levels and ACI conditions. This parameter adjustment allows the system to maintain adequate signal selectivity for wake-up receiver functionality while avoiding the continuous power consumption penalty of high-quality frequency generation, resolving the contradiction between power efficiency and selectivity performance.
3Use of energy by moving object
If the local oscillator arrangement uses relaxed frequency generation quality, then energy usage is minimized, but frequency accuracy deteriorates
Solution Approach 1:
The local oscillator arrangement transitions from static to dynamic operation, adjusting frequency generation quality based on real-time conditions. The system uses relaxed frequency generation quality (lower energy usage) during normal operation but can switch to higher quality mode when frequency accuracy becomes critical for handling ACI or when tolerable quality estimates indicate performance degradation risks.
Solution Approach 2:
The system changes frequency generation quality parameters dynamically based on estimated tolerable levels. By monitoring conditions and adjusting parameters, the system maintains frequency accuracy adequate for wake-up receiver function while minimizing energy usage, avoiding continuous operation at high accuracy settings that would unnecessarily consume power.
Data Source
AI summary
A radio receiver includes 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.