RSSI Compensation Circuit for Frequency and AGC Gain Errors
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Solution Overview
Problem
Existing wireless communication systems face inaccuracies in received signal strength indication (RSSI) due to signal attenuations and gain errors during transmission, which affect positioning, control, and scheduling, especially in multi-transmitter environments.
Innovation Solution
A device with compensation generating circuits to calculate first and second compensation values based on receiving frequency and automatic gain control coefficients, respectively, to improve the accuracy of RSSI generation by accounting for signal attenuations and gain errors, using a closed-loop automatic gain control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal transmission is performed in wireless communication systems, then communication functionality is achieved, but signal attenuations and gain errors occur causing RSSI inaccuracy
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values for different receiving frequencies and automatic gain control coefficients before actual RSSI measurement. The compensation table is prepared in advance, containing attenuation compensation values for various frequencies and gain error compensation values for different AGC coefficients, enabling quick lookup and correction during operation without real-time complex calculations.
Solution Approach 2:
The patent implements feedback by using the measured receiving frequency and automatic gain control coefficient to query pre-stored compensation values, then applying these compensation values to correct the RSSI measurement. The system continuously monitors the actual operating parameters and adjusts the RSSI calculation based on feedback from the compensation table, creating a closed-loop correction mechanism.
2Measurement precision
If compensation values are calculated and stored for different frequencies and gain coefficients, then RSSI accuracy is improved, but device complexity increases
Solution Approach 1:
The patent reduces device complexity by performing the complex compensation calculations in advance and storing the results in a lookup table. Instead of calculating attenuation and gain error compensations in real-time during RSSI measurement, the system pre-computes these values for all expected operating conditions (different frequencies and AGC coefficients) and stores them for quick retrieval.
Solution Approach 2:
The patent uses copying by creating a pre-computed compensation table that replicates the results of complex calculations. Rather than performing the actual physical calculations during operation, the system copies the pre-determined compensation values from the table into the RSSI calculation, replacing complex computational operations with simple data retrieval and addition.
Data Source
AI summary
A method can include: generating a first compensation value based on a receiving frequency, where the first compensation value represents attenuations of a wireless signal at different receiving frequencies during transmission to an analog receiving circuit; generating a second compensation value based on an automatic gain control coefficient, where the second compensation value represents gain errors corresponding to different automatic gain control coefficients; and generating a received signal strength indication based on the first and second compensation values, an intermediate frequency signal strength, and a gain of the intermediate frequency signal with respect to a received signal.