Interference Estimation for Decoding in Non-Stationary Wireless Channels
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Solution Overview
Problem
Decoding performance in wireless networks is limited by non-stationary and frequency-selective interference, which is challenging to mitigate due to the lack of reliable interference estimates from insufficient or overly large time/frequency intervals.
Innovation Solution
A decoding system with a first interference estimator generating successive instantaneous interference estimates and a second estimator producing an average interference estimate based on these, allowing for adaptive tracking of interference within approximately stationary intervals for effective mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If samples are taken over a limited time or frequency interval, then the number of samples is sufficient for estimation, but the interval is too small to provide reliable interference estimates
Solution Approach 1:
The patent divides the interference estimation process into two separate estimators: a first interference estimator that generates successive instantaneous interference estimates over short time/frequency intervals, and a second interference estimator that produces an average interference estimate by combining multiple instantaneous estimates. This segmentation allows the system to use limited samples effectively while achieving reliable overall estimates through the combination of multiple measurements.
2Quantity of substance
If samples are taken over a large time or frequency interval, then more samples are available for estimation, but the interference exhibits non-stationary characteristics making the estimate unreliable
Solution Approach 1:
The patent implements a dynamic approach where the first interference estimator continuously generates successive instantaneous interference estimates adaptively over the communications channel. The second interference estimator then dynamically combines these instantaneous estimates to produce an average interference estimate. This dynamic estimation process allows the system to track interference characteristics while accounting for non-stationary behavior, ensuring reliable estimates even when interference properties change over time or frequency.
3Productivity
If interference is estimated using insufficient samples, then the estimation process is fast, but the interference estimate is unreliable
Solution Approach 1:
The patent merges the outputs of multiple instantaneous interference estimates from the first interference estimator into a single average interference estimate through the second interference estimator. By combining multiple estimates rather than relying on a single estimation, the system achieves both speed (through parallel instantaneous estimates) and reliability (through the averaged result that reduces the impact of individual estimate variations).
Data Source
AI summary
Systems, methods, apparatus, and techniques are provided for receiving signals over a communications channel, generating a plurality of successive estimates of instantaneous interference present in the communications channel at a respective plurality of samples based on the received signals, producing an average interference estimate of the interference channel based on the plurality of successive estimates, and producing a decoded codeword based on i) the average interference estimate and ii) the received signals.