Adaptive Radio Receiver Equalizer Parameter Selection
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Solution Overview
Problem
Conventional CDMA mobile radio receivers experience performance degradation due to Multiple Access Interference (MAI) and code orthogonality loss in multipath propagation environments, particularly at high data rates, leading to sub-optimal performance and increased power consumption.
Innovation Solution
The implementation of adaptive channel equalization techniques, where processor-executed code sequences select between rake and equalizer processing based on estimated channel parameters, optimizing processing resources and power consumption by dynamically switching between these methods depending on channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel equalization is implemented to improve receiver performance in multipath environments, then performance is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic selection between rake receiver and equalizer processing based on estimated channel conditions. The receiver adapts its processing mode in real-time, switching from rake processing in mild conditions to equalization in severe multipath conditions, thereby achieving high performance only when necessary and reducing overall complexity
Solution Approach 2:
The patent changes the processing parameter (rake vs equalization) based on channel condition parameters. By monitoring channel quality metrics and adjusting the processing mode accordingly, the system optimizes the trade-off between performance and complexity through parameter adaptation
2Reliability
If adaptive equalization processing is used to enhance performance in varying channel conditions, then reliability is improved, but use of energy increases
Solution Approach 1:
The patent dynamically adjusts power consumption by activating the computationally intensive equalization processing only when channel conditions warrant it. In good channel conditions, the simpler rake processing is used, significantly reducing power consumption while maintaining adequate performance
Solution Approach 2:
The system changes its operational parameter (processing mode) based on channel conditions, thereby adapting power consumption to actual needs. This prevents wasteful energy expenditure on complex equalization when simple rake processing suffices
3Measurement precision
If channel equalization is employed to combat intersymbol interference, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the processing approach into two distinct paths: rake processing for mild conditions and equalization for severe conditions. This segmentation allows the system to apply the more complex and precise equalization method only when the channel conditions justify the additional complexity
Solution Approach 2:
The system dynamically selects the appropriate processing segment based on real-time channel condition assessment, transitioning between rake and equalization modes to optimize the balance between detection accuracy and processing complexity
Data Source
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AI summary
A method and corresponding receiver for processing radio signals in a radio receiver. The method comprises: receiving digital samples of an incoming radio signal and processing those samples in accordance with an equaliser algorithm utilising a set of equaliser parameters to generate an equalised output; estimating at least one parameter of a channel over which the incoming signal has been transmitted; and selecting at least one of the equaliser parameters based on at least one of said estimated channel parameters.