Adaptive Digital Edge Filtering for Wireless Receivers
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Solution Overview
Problem
Existing signal processing technologies face challenges in effectively filtering out unwanted signals that are close to desired signals in the frequency domain, leading to increased hardware costs, latency, and distortion, particularly in advanced communication systems like 5G and IoT, where guard bands are narrowed.
Innovation Solution
A filtering arrangement that divides incoming digital signals into multiple parts, with adaptive frequency shifting and processing branches to adjust filter edges dynamically, allowing for efficient filtering of unwanted signals while maintaining low filter tap requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filtering with very steep filter edges is applied to remove un-desired signals close to desired signals, then the ability to block un-desired signals is improved, but hardware cost increases
Solution Approach 1:
The patent divides the digital signal into two or more signal parts using dividing circuitry, with each part processed by a separate processing branch. This segmentation allows the signal to be filtered in multiple stages with gentler filter edges, avoiding the need for a single steep filter while achieving effective separation of desired and un-desired signals.
Solution Approach 2:
The patent employs frequency shifting circuitry that dynamically adjusts the frequency of signal parts based on detection of un-desired signals. The frequency shifting amount is adaptively changed to optimize filtering performance, allowing the system to maintain effective signal separation without requiring fixed steep filter characteristics that would increase hardware complexity.
2Object-affected harmful factors
If filtering with very steep filter edges is applied to remove un-desired signals close to desired signals, then the ability to block un-desired signals is improved, but latency increases
Solution Approach 1:
By segmenting the signal into multiple parts that are processed separately and then combined, the patent achieves effective filtering with gentler filter edges. This approach reduces the filter length required compared to a single steep filter, thereby reducing the processing time and latency while maintaining effective un-desired signal rejection.
Solution Approach 2:
The adaptive frequency shifting mechanism allows the system to optimize filtering in real-time without requiring long fixed filter responses. By dynamically adjusting frequency parameters, the system achieves effective signal separation with shorter processing delays compared to static steep filter designs.
3Object-affected harmful factors
If filtering with very steep filter edges is applied to remove un-desired signals close to desired signals, then the ability to block un-desired signals is improved, but distortion increases
Solution Approach 1:
The patent divides the signal into multiple parts and applies filtering to each segment separately. This segmentation allows the use of gentler filter edges for each individual filter, reducing the introduction of distortion and inter-symbol interference that would occur with a single steep filter, while still achieving effective overall signal separation.
Solution Approach 2:
The adaptive frequency shifting circuitry dynamically adjusts the frequency parameters of signal parts to optimize filtering performance. By continuously adapting the frequency shifting amount based on detected un-desired signals, the system maintains effective signal separation while minimizing distortion and preserving signal integrity better than fixed steep filter designs.
4Object-affected harmful factors
If the number of filter taps is increased to achieve steeper filter edges, then the ability to block un-desired signals is improved, but hardware cost increases
Solution Approach 1:
The patent segments the signal processing into multiple branches, each with its own filter. By dividing the overall filtering task across multiple gentler filters rather than using a single filter with many taps, the system achieves effective signal separation with reduced total computational complexity and hardware requirements.
5Object-affected harmful factors
If the number of filter taps is increased to achieve steeper filter edges, then the ability to block un-desired signals is improved, but latency increases
Solution Approach 1:
By segmenting the signal into multiple parts processed by separate filtering branches, the patent reduces the required filter length in each branch. This segmentation approach decreases the overall processing latency compared to using a single long filter with many taps, while maintaining effective un-desired signal rejection through the combined processing of multiple segments.
Data Source
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AI summary
A filtering arrangement for a wireless communication receiver is disclosed. The filtering arrangement comprises an input port configured to receive a digital signal, wherein the digital signal has a signal bandwidth and comprises a desired signal, dividing circuitry configured to divide the digital signal into two or more signal parts, wherein the two or more signal parts comprise two edge signal parts, and a respective processing branch associated with each of the two or more signal parts. A processing branch configured to process a respective edge signal part comprises a digital edge filter configured to filter the edge signal part, determination circuitry configured to determine whether an un-desired signal is comprised in the edge signal part, and frequency shifting circuitry configured to frequency shift the edge signal part responsive to determination by the determination circuitry. Corresponding wireless communication receiver, filtering method and computer program product are also disclosed.