Segmented Interference Whitening for Channel Estimation Errors
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively compensating for channel estimation errors due to interference, particularly in environments with long delay spreads or high Doppler frequencies, leading to increased noise plus interference variance.
Innovation Solution
A wireless communication device that segments resource elements into distinct areas based on channel estimation errors and applies customized whitening filters to these areas, including a first adjustment whitening filter and segmentation adjustment whitening filters, to perform an interference whitening operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single whitening filter is applied to all resource blocks in the same group, then the interference whitening operation can be simplified, but it becomes difficult to appropriately compensate for channel estimation errors
Solution Approach 1:
The patent divides the resource block group into multiple subgroups and applies different whitening filters to each subgroup. This segmentation allows the system to adapt to varying channel conditions across different resource blocks while maintaining manageable complexity through structured division of the filtering operation.
Solution Approach 2:
The patent implements local quality by calculating separate whitening filters for different subgroups of resource blocks based on their specific channel conditions. Each subgroup receives a customized filter that optimally compensates for local channel estimation errors, rather than applying a uniform filter across all resource blocks.
2Adaptability or versatility
If channel estimation is performed in environments with long delay spreads or high Doppler frequencies, then the system can operate in diverse wireless conditions, but the channel estimation performance becomes unsatisfactory and noise plus interference variance increases
Solution Approach 1:
The patent changes the parameters of the whitening filter based on channel conditions, specifically adapting the filter characteristics to compensate for channel estimation errors that occur in challenging environments with long delay spreads or high Doppler frequencies. This parameter adaptation enables the system to maintain performance across diverse wireless conditions.
3Speed
If interference whitening operation is performed using the same filter across resource blocks, then the processing speed can be maintained, but the ability to appropriately compensate for channel estimation error is reduced
Solution Approach 1:
The patent segments resource blocks into subgroups and applies different whitening filters to each subgroup. This segmentation enables the system to achieve accurate interference compensation tailored to each subgroup's channel conditions while maintaining processing speed through efficient structured computation.
Data Source
AI summary
A wireless communication device includes a transceiver configured to receive a wireless signal, and a processor configured to in a time-frequency domain, in which resources are allocated across subcarriers and symbols in a given time slot for data transmission, determine a first area and a second area within a resource element (RE) area including a plurality of REs, segment the second area into a plurality of segmentation areas, calculate a first adjustment whitening filter and a plurality of segmentation adjustment whitening filters to be respectively applied to the first area and the plurality of segmentation areas, and perform an interference whitening operation on the first area and the plurality of segmentation areas, based on the first adjustment whitening filter and the plurality of segmentation adjustment whitening filters, respectively.