UWB Receiver Sliding Window CIR Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ultra-wideband (UWB) communication systems face challenges in reducing channel-induced noise while maintaining performance, as known implementations require significant power and circuitry, particularly in compact devices like RFID tags, where power efficiency is crucial.
Innovation Solution
A UWB receiver apparatus and method that uses a sliding window approach to develop and store channel impulse response (CIR) estimates, employing ternary samples and a correlator to filter noise effectively, reducing power consumption and circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional noise filtering methods are used in UWB receivers, then channel-induced noise is reduced, but power consumption and circuit complexity increase significantly
Solution Approach 1:
The patent segments the channel impulse response estimation into multiple discrete taps (e.g., 16 taps), where each tap processes a specific time delay component of the multipath channel. This segmentation allows selective processing of significant path components while ignoring weaker ones, reducing overall computational power requirements while maintaining noise filtering effectiveness.
Solution Approach 2:
The patent applies partial action by processing only the most significant multipath components rather than all possible channel responses. By identifying and processing only the dominant paths (excessive action on critical components), the system achieves adequate noise filtering with reduced power consumption compared to processing the entire channel response.
2Object-affected harmful factors
If conventional noise filtering methods are used in UWB receivers, then channel-induced noise is reduced, but circuit complexity increases
Solution Approach 1:
The circuit is segmented into discrete tap units, each handling a specific time delay component. This modular segmentation simplifies the overall circuit design by breaking down the complex channel processing into manageable, identical building blocks that can be selectively instantiated based on channel conditions.
Solution Approach 2:
The circuit implements partial processing by activating only the necessary number of tap units based on the actual channel complexity. Rather than always processing all possible multipath components, the system adapts to process only what is needed, reducing circuit complexity while maintaining filtering performance.
3Reliability
If full channel processing is implemented, then noise filtering performance is maximized, but power consumption increases
Solution Approach 1:
The system applies partial action by processing only the significant multipath components that contribute meaningfully to the received signal. By identifying the energy threshold and processing only paths above this threshold, the system achieves adequate noise filtering performance without the excessive power consumption of processing all possible channel responses.
Solution Approach 2:
The patent applies local quality by allocating processing resources selectively to specific time delay components based on their significance. Rather than uniform processing of all channel taps, the system concentrates computational power on the most relevant paths, achieving high filtering performance where needed while conserving power in less critical areas.
Data Source
AI summary
In an ultra-wideband (“UWB”) receiver, a received UWB signal is periodically digitized as a series of ternary samples. The samples are continuously correlated with a predetermined preamble sequence to develop a correlation value. When the value exceeds a predetermined threshold, indicating that the preamble sequence is being received, estimates of the channel impulse response (“CIR”) are developed. When a start-of-frame delimiter (“SFD”) is detected, the best CIR estimate is provided to a channel matched filter (“CMF”) substantially to filter channel-injected noise.