Interference Cancellation Delay Compensation in Wireless Receivers
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Solution Overview
Problem
In WCDMA wireless communication systems, interference from multiple access interference (MAI) and multipath signals causes noise that hinders successful signal decoding, particularly in high-density user environments, leading to decreased communication quality.
Innovation Solution
A method and system for compensating interference cancellation delay by dynamically selecting a processing path for received signals, which includes an interference cancellation path or a pass-through path, using a weighting iteration and addback processes to suppress interference, and adjusting the sample rate to match the delay introduced by the interference cancellation path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference cancellation processing is applied to suppress MAI and multipath interference, then communication quality and signal decoding accuracy are improved, but processing delay increases
Solution Approach 1:
The system performs preliminary interference cancellation processing on received signals before main decoding operations. By pre-suppressing MAI and multipath interference in advance, the signal quality is improved beforehand, enabling more accurate subsequent decoding while the delay is distributed and managed in the processing pipeline
Solution Approach 2:
The system dynamically adjusts interference cancellation parameters and processing depth based on real-time channel conditions and interference levels. When interference is severe, more aggressive cancellation is applied; when conditions are good, processing is reduced, optimizing the trade-off between decoding accuracy and processing delay adaptively
2Adaptability or versatility
If dynamic path selection between interference cancellation and pass-through is implemented, then adaptability to different interference conditions is improved, but device complexity increases
Solution Approach 1:
The system uses feedback from interference indicators and channel quality measurements to dynamically select between interference cancellation path and pass-through path. The feedback mechanism monitors signal conditions and automatically adjusts the processing path selection, providing adaptability through a relatively simple control loop rather than complex decision logic
Solution Approach 2:
The system introduces an intermediary path selection mechanism that mediates between the interference cancellation path and pass-through path. This intermediary layer simplifies the complexity by providing a unified interface and standardized switching logic, hiding the underlying complexity of path management from the rest of the system
Data Source
AI summary
Aspects of a method and system for compensation of interference cancellation delay are provided. In this regard, a wireless communication device may receive one or more signals and may be operable to select, whether dynamically or statically, a processing path for processing the one or more received signals. The selected processing path may comprise one of an interference cancellation processing path and a pass-through processing path. A delay introduced by the pass-through processing path may be approximately equal to a processing delay introduced by the interference cancellation processing path. The one or more received signals may comprise HSDPA signals. The selection of processing path may be based on a measure of interference present in the one or more received signals.