Terminal AGC Noise Power Estimation to Prevent Receiver Saturation
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately calculating quantization noise power and peak clipping noise power, leading to potential receiver saturation and failure due to unreasonable Automatic Gain Control (AGC) settings.
Innovation Solution
A method is introduced to calculate noise power by obtaining a first power offset value of actual AGC received power relative to a predetermined power within a transmission time interval, using a preset correspondence between modulation modes and AGC backoff values to determine a target AGC backoff value, and subsequently calculating quantization or peak clipping noise power based on these values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AGC backoff value is set according to the number of AGC bits supported, then the receiver can operate within a reasonable AGC processing range, but the quantization noise power or peak clipping noise power cannot be accurately calculated
Solution Approach 1:
The patent changes the parameter from fixed AGC backoff values to dynamic noise power calculations. By computing actual quantization noise power and peak clipping noise power based on signal characteristics, the system adapts the AGC backoff value to match real noise conditions rather than relying on predetermined values, thereby resolving the contradiction between reliable operation and accurate measurement.
Solution Approach 2:
The patent replaces the mechanical/empirical method of setting AGC backoff based on bit count with a computational approach. By substituting the simple bit-counting mechanism with actual noise power calculations involving signal sampling and statistical analysis, the system achieves both reliable operation range and accurate noise measurement simultaneously.
2Reliability
If the input power is set to ensure minimum signal to noise ratio requirement, then the receiver can distinguish effective received signal, but the received signal may be saturated when input power exceeds ADCmax
Solution Approach 1:
The patent implements feedback by continuously monitoring signal characteristics and using calculated noise power to adjust AGC backoff values. This feedback mechanism allows the receiver to adapt to varying input power conditions, maintaining optimal operation within the dynamic range of the ADC by preventing both saturation and insufficient signal detection.
Solution Approach 2:
The patent transforms the static AGC backoff setting into a dynamic parameter that adapts to real-time signal conditions. By calculating noise power based on actual received signals and adjusting backoff accordingly, the system maintains reliable signal detection while avoiding receiver saturation across varying input power levels.
Data Source
AI summary
A method for obtaining a noise power and a terminal are provided. The obtaining method includes: obtaining a first power offset value of an actual automatic gain control (AGC) received power relative to a first predetermined received power within a predetermined transmission time interval (TTI); obtaining, according to a preset correspondence between a modulation mode and an AGC backoff value, a target AGC backoff value corresponding to a current modulation mode; and obtaining the noise power according to the first power offset value, the target AGC backoff value, and a current AGC received power.