Dynamic Interpolator Location in CDMA Rake Receiver
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Solution Overview
Problem
CDMA base stations face inefficiencies in rake demodulation due to fixed interpolator locations, which do not adapt to varying user/cell/traffic configurations, leading to suboptimal multi-path signal extraction and resource utilization.
Innovation Solution
Dynamically locating an interpolator in the despreader data-path based on real-time system configuration evaluation, allowing interpolation at optimal points within the rake receiver to enhance sample rate accuracy and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the interpolator location is fixed in the despreader data-path, then the base station configuration cost is minimized, but the implementation efficiency for varying user/cell/traffic configurations deteriorates
Solution Approach 1:
The patent applies the dynamics principle by making the interpolator location adjustable rather than fixed. The system can dynamically reposition the interpolator within the despreader data-path based on varying user/cell/traffic configurations, allowing the base station to adapt to different operational conditions while maintaining cost-effective hardware architecture.
2Device complexity
If the interpolator location is fixed, then the hardware structure is simplified, but the signal processing accuracy for different network conditions deteriorates
Solution Approach 1:
The system dynamically adjusts the interpolator location based on network conditions to optimize signal processing accuracy. The interpolator can be repositioned within the despreader data-path according to varying user/cell/traffic configurations, enabling the system to maintain high processing accuracy across different operational scenarios without requiring complex hardware changes.
3Productivity
If the interpolator is positioned to optimize for specific configurations, then the performance for that configuration is maximized, but the performance for other configurations deteriorates
Solution Approach 1:
The patent implements dynamic interpolator repositioning that adapts to different user/cell/traffic configurations. Rather than being optimized for a single configuration, the system can shift the interpolator location to maintain optimal performance across varying network conditions, achieving versatility without sacrificing performance in any specific scenario.
Solution Approach 2:
The system changes the positional parameter of the interpolator within the despreader data-path based on detected network conditions. By adjusting this key parameter dynamically, the system optimizes signal processing performance for the current configuration while maintaining capability to adapt to other configurations as network conditions change.
Data Source
AI summary
Apparatus and method for optimizing interpolation in the despreader data-path of a wireless telecommunications network employing Code Division Multiple Access (CDMA) technology. A base station dynamically evaluates its configuration to determine an interpolator location. The location of the interpolator in a despreader data-path is dynamically selected. A received signal is interpolated. The despread received signals are combined, and further processing is applied to the combined signal. To enhance system performance, the interpolator may, be located at least to perform chip-sample interpolation per antenna stream at chip rate, chip-sample interpolation per user at chip rate, or symbol-sample interpolation per user at sub-symbol rate.