Code Channel Detection Using Dynamic Reference Thresholds
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Solution Overview
Problem
Existing code channel detection technologies in high-speed wireless communication systems, such as CDMA, face challenges in achieving accurate detection rates and low false alarm rates, especially in scenarios with weak interference, due to inaccurate noise threshold estimation.
Innovation Solution
A method that involves equalizing and descrambling received signals, performing energy accumulation on symbol channels, and using multiple reference values based on thresholds to determine active code channels, ensuring accurate detection and reducing false alarms by considering various interference scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple noise threshold determination method is used, then the device complexity is reduced, but the code channel correct detection rate and false alarm rate cannot be guaranteed in every interference scenario
Solution Approach 1:
The patent changes the detection parameter from a simple fixed noise threshold to multiple dynamic reference values (first reference value based on in-band noise, second reference value based on common channel energy, third reference value based on maximum energy). This parameter transformation enables accurate detection across different interference scenarios while maintaining reasonable system complexity.
Solution Approach 2:
The detection threshold is transformed from a static simple noise threshold to dynamic reference values that adapt to different interference conditions. The system dynamically selects and combines multiple reference values based on actual signal characteristics, enabling the detection mechanism to respond appropriately to varying interference levels.
2Measurement precision
If multiple reference values and energy accumulation techniques are employed, then the code channel correct detection rate is improved, but the device complexity increases
Solution Approach 1:
The detection process is segmented into distinct functional modules: equalization module, descrambling and despreading module, energy accumulation module, and multi-reference value determination module. Each module performs a specific function, making the complex detection process manageable and implementable through standardized communication system components.
Solution Approach 2:
The system performs preliminary actions by pre-calculating multiple reference values (first reference value from in-band noise, second from common channel, third from maximum energy) before the actual detection decision. This preliminary preparation enables the final detection to be accurate without requiring complex real-time computations during the critical detection moment.
Data Source
AI summary
Embodiments of the present invention disclose a code channel detecting method and a related device and a communication system. In the solutions provided by the embodiments of the present invention, whether a DPA code channel is in an active state is determined with multiple thresholds based on a first reference value and a third reference value, or based on a first reference value, a second reference value and a third reference value. This mechanism takes multiple possible false determination situations into consideration, thereby ensuring a code channel correct detection rate in multiple interference scenarios and relatively reducing a false alarm rate.