Digital Receiver Gain Control for Full-Bandwidth PDSCH Signals
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Solution Overview
Problem
Existing gain adjustment control methods in radio receiver systems, particularly in 5G OFDM terminal receivers using 256QAM modulation, face challenges in accurately demodulating signals with varying strengths due to high peak-to-average ratios and sensitivity to interference and multi-path effects in analog signal processing.
Innovation Solution
A gain adjustment control method that calculates the energy of full-bandwidth PDSCH transmission signals in the intermediate frequency or baseband digital domain, determining gain control parameters to adjust receiver gain, incorporating a bandwidth conversion coefficient and multi-antenna gain to improve signal flatness and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If analog signal processing is used in the RF link for automatic gain control, then gain adjustment can be achieved, but the system becomes sensitive to interference and multi-path effects, leading to demodulation failure
Solution Approach 1:
The patent replaces the analog RF link processing with digital baseband processing. Specifically, the automatic gain control function is implemented in the digital domain using baseband signals instead of analog RF signals, thereby eliminating the sensitivity to interference and multi-path effects while maintaining the gain control capability
Solution Approach 2:
The patent introduces an intermediary conversion process where the RF signal is first converted to digital baseband signal through ADC, and then the gain control is applied in the digital domain. This intermediary digital representation acts as a mediator that protects the gain control function from the adverse effects present in the analog RF domain
2Device complexity
If constant gain is used in the receiver, then the system structure is simple, but the receiver cannot correctly demodulate signals with wide energy range
Solution Approach 1:
The patent implements dynamic gain adjustment in the digital baseband domain. The gain control parameter is adjusted dynamically based on the received signal strength, allowing the receiver to adapt to signals with wide energy range while maintaining a relatively simple overall structure compared to complex analog AGC systems
3Reliability
If digital domain processing is used for gain control, then anti-interference performance is improved, but calculation complexity increases
Solution Approach 1:
The patent extracts only the necessary components for gain control calculation in the digital domain. Instead of processing the entire signal, it selectively processes the baseband signal components that are sufficient for determining the gain control parameter, thereby reducing calculation complexity while maintaining anti-interference performance
Solution Approach 2:
The patent changes the domain parameter from analog RF frequency to digital baseband frequency. This parameter change enables the use of simpler digital signal processing operations that are less computationally intensive while providing better anti-interference characteristics inherent to digital processing
Data Source
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AI summary
Again adjustment control method, device and apparatus, and a computer-readable storage medium, wherein the method comprises calculating the energy of a full-bandwidth physical downlink shared channel transmission signal in an intermediate frequency digital domain or a baseband digital domain according to a set calculation period, and then determining a gain control adjustment parameter according to the energy of the full-bandwidth PDSCH transmission signal, and adjusting the gain of a receiver.