Adaptive Radio Receiver Equalization for Multipath Interference
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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, especially at high data rates, leading to sub-optimal performance in WCDMA systems.
Innovation Solution
A radio receiver employing channel equalization means that estimate and select equalizer parameters based on channel conditions, switching between rake and equalizer processing to optimize performance while minimizing processing resources and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel equalization is implemented to improve performance in multipath conditions, then data transmission reliability is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent implements dynamic selection between rake receiver and equalizer processing modes based on real-time channel conditions. The receiver adapts its processing complexity by switching algorithms according to multipath severity, using less complex rake processing when channel conditions are good and more complex equalization when multipath interference is severe, thereby optimizing the trade-off between reliability and device complexity
Solution Approach 2:
The patent changes the processing parameter (algorithm type) based on channel conditions. By monitoring channel quality metrics and dynamically adjusting the processing mode between rake and equalizer, the system adapts its complexity level to match the actual transmission environment, improving reliability only when necessary while minimizing unnecessary complexity
2Manufacturing precision
If channel equalization is used to combat intersymbol interference, then manufacturing precision of signal reception is improved, but use of energy increases
Solution Approach 1:
The patent dynamically adjusts energy consumption by switching between low-power rake processing and high-power equalization based on channel conditions. The system monitors signal quality and only activates the more energy-intensive equalization algorithm when multipath interference exceeds a threshold, thereby minimizing energy usage while maintaining reception precision when needed
Solution Approach 2:
The patent changes the processing mode parameter based on channel quality assessment. By adjusting the processing algorithm selection according to channel conditions, the system optimizes the energy-reception precision trade-off, using precise equalization only when the channel degradation warrants the additional energy expenditure
3Adaptability or versatility
If adaptive equalizer parameter selection is implemented to optimize performance, then adaptability to channel conditions is improved, but device complexity increases
Solution Approach 1:
The patent implements adaptive parameter selection by dynamically choosing between predefined equalizer configurations based on channel condition assessment. The system evaluates channel quality metrics and selects appropriate equalizer parameters (such as tap length, algorithm type, or processing mode) to match the current environment, achieving adaptability through selective parameter adjustment rather than full system reconfiguration
Solution Approach 2:
The patent changes equalizer parameters adaptively based on channel conditions. By monitoring channel quality and adjusting parameters such as processing mode, equalizer order, or algorithm selection, the system achieves versatility in handling different channel scenarios while controlling complexity through parameter-level adaptation rather than structural changes
Data Source
AI summary
Techniques are described for optimizing processing facilities of a receiver in a wireless communication environment, taking into consideration processing performance set against the computing resources and/or power consumption required to obtain the processing performance. An embodiment of a radio receiver is described that includes a channel equalization means arranged to receive digital samples of an incoming signal and to generate an equalized output, said channel equalization means including means for processing said digital samples in accordance with an equalizer algorithm utilizing a set of equalizer parameters. The receiver can include means for estimating at least one parameter of a channel over which the signal has been received, and means for selecting at least one of said equalizer parameters based on at least one of said estimated channel parameters. Related methods, algorithms, and computer program products are also described.