Wireless Receiver Gain Control for Mixed-Signal ADC Range
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Solution Overview
Problem
Wireless communication devices face challenges in managing power mismatches between cell common and UE-specific signals, particularly when receiving signals of varying intensities, which can lead to signal clipping and reduced signal-to-noise ratio (SNR) due to the dynamic range limitations of analog-to-digital converters (ADCs).
Innovation Solution
The wireless communication device controls the gain of received signals by detecting root mean square (RMS) values for both cell common signals (such as SSB, CSI-RS, and TRS) and UE-specific signals (such as PDCCH, PDSCH, and PDS) and UE-specific signals (such as PDSCH) and UE-specific signals (such as PDCCH DMRS), determining a target RMS value based on these values to optimize gain control, ensuring the amplified signal remains within the ADC's dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gain is increased to amplify weak signals, then the signal-to-noise ratio is improved, but strong signals may exceed the ADC dynamic range causing clipping
Solution Approach 1:
The patent implements dynamic gain control by continuously monitoring the RMS values of received signals and adjusting the gain accordingly. The gain is adapted in real-time based on signal strength conditions, allowing the system to optimize amplification for weak signals while preventing clipping of strong signals through continuous dynamic adjustment rather than fixed gain settings
Solution Approach 2:
The patent applies different gain values to different signal types (cell common signals versus UE-specific signals) based on their individual RMS characteristics. By treating each signal type separately and applying localized gain control tailored to each signal's power level, the system optimizes amplification for each signal while preventing any single signal from exceeding the ADC dynamic range
2Reliability
If separate gain control is applied to different signal types, then each signal's quality is optimized, but the device complexity increases
Solution Approach 1:
The patent changes the parameter being controlled from a single fixed gain value to multiple variable gain values (first gain for cell common signals, second gain for UE-specific signals). By allowing these gain parameters to vary dynamically based on RMS measurements, the system achieves optimized signal quality while the complexity is managed through systematic parameter adaptation rather than complex hardware architecture
Data Source
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AI summary
An operating method of a wireless communication device includes detecting a first root mean square (RMS) value for a received power of a first signal in an nth slot, n being a positive integer, and the first signal being a synchronization signal block (SSB), a channel state information-reference signal (CSI-RS) or a tracking reference signal (TRS), detecting a second RMS value for a received power of a second signal in the nth slot, the second signal being a physical downlink shared channel (PDSCH) demodulation reference signal (DMRS), determining a target RMS value for an (n+1)th slot based on at least one of the first RMS value or the second RMS value, and controlling a gain for the first signal and a gain for the second signal based on the target RMS value for the (n+1)th slot.