Dynamic WOLA Receiver Filter for 5G Blocker Rejection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional channel filters in 5G base-stations and user equipment are inefficient due to their large size, high power consumption, and inability to adapt dynamically to blocking signals, leading to increased inter-symbol interference and reduced resilience against multipath fading.
Innovation Solution
Implementing a dynamic window overlap and add (WOLA) procedure that adjusts the window length based on measured blocker strength and frequency offset, allowing for optimized filtering and reduced channel filter size, thereby improving resilience and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional channel filters (FIR filters) are used to eliminate blocking signals, then blocking signal interference is reduced, but power consumption and chip area increase significantly
Solution Approach 1:
The patent extracts only the necessary portion of the filter function by using a short FIR filter combined with overlap-add processing. Instead of using a single long filter to handle all scenarios, the system extracts the essential filtering capability and combines it with time-domain windowing to achieve the same blocking rejection with much lower computational complexity and power consumption.
Solution Approach 2:
The patent introduces dynamic adjustment of the filter length and window size based on the detected blocking signal characteristics. The system adapts the filtering parameters in real-time according to the blocker strength and frequency offset, optimizing the balance between blocking rejection performance and power consumption for each specific scenario.
2Object-affected harmful factors
If conventional channel filters are used to eliminate blocking signals, then blocking signal interference is reduced, but device area increases significantly
Solution Approach 1:
The patent extracts only the necessary portion of the filter function by using a short FIR filter combined with overlap-add processing. Instead of using a single long filter to handle all scenarios, the system extracts the essential filtering capability and combines it with time-domain windowing to achieve the same blocking rejection with much lower computational complexity and power consumption.
Solution Approach 2:
The patent uses overlap-add processing where a short filter is applied multiple times to different segments of the input signal, and the results are summed together. This copying approach replaces the need for a single long filter, achieving equivalent filtering performance with a much shorter filter that requires less chip area.
3Object-affected harmful factors
If long FIR filters are used to filter blocking signals, then blocking signal rejection is improved, but inter-symbol interference increases
Solution Approach 1:
The patent introduces dynamic adjustment of the filter length and window size based on the detected blocking signal characteristics. The system adapts the filtering parameters in real-time according to the blocker strength and frequency offset, optimizing the balance between blocking rejection performance and inter-symbol interference for each specific scenario.
Solution Approach 2:
The patent segments the filtering process into multiple short filtering operations applied to different time segments of the input signal, followed by overlap-add processing. This segmentation approach reduces inter-symbol interference compared to a single long filter, while maintaining blocking rejection through the cumulative effect of multiple short filter applications.
4Device complexity
If fixed-length filters are used, then device complexity is reduced, but adaptability to different blocking conditions deteriorates
Solution Approach 1:
The patent introduces dynamic adjustment of the filter length and window size based on the detected blocking signal characteristics. The system adapts the filtering parameters in real-time according to the blocker strength and frequency offset, optimizing the balance between blocking rejection performance and inter-symbol interference for each specific scenario.
Data Source
AI summary
A radio frequency front end device includes an antenna interface, configured to receive a signal representing a radio transmission; a radio frequency detector, wherein the signal includes a first signal in a first frequency range and a second signal in a second frequency range, adjacent to the first frequency range, and wherein the radio frequency detector is configured to detect the second signal within the second frequency range; and a processor, configured to select, based on the second signal, a sampling window size for a sampling window of a signal windowing procedure for the first signal in the first frequency range; and implement the signal windowing procedure on the first signal at the sampling window size.