Multi-Antenna AGC Glitch Correction Using Branch Correlation
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Solution Overview
Problem
Existing multi-antenna communication systems face performance degradation due to glitches introduced by non-ideal transient responses of automatic gain control (AGC) in attenuators, which current glitch suppression schemes fail to completely eliminate.
Innovation Solution
Implement a glitch-free AGC solution using time and spatial correlation of multiple antenna branches, compensating data contaminated by glitches with data not affected by glitches through minimum mean-squared error (MMSE) estimation and asynchronous AGC triggering/release across branches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If AGC is employed to regulate the dynamic range of received signals in multi-antenna systems, then the dynamic range is extended, but glitches are introduced due to non-ideal transient responses of attenuators
Solution Approach 1:
The patent converts the harmful effect of glitches into a beneficial process by using the glitchy signal to identify and locate affected samples, then replacing them with corrected values. The harmful transient response is transformed into a detectable event that triggers a correction mechanism, ultimately improving signal quality while maintaining the dynamic range extension benefit of AGC.
Solution Approach 2:
The patent introduces an intermediary correction mechanism between the AGC attenuator and the final signal processing. This intermediary layer detects glitches, identifies affected samples, and replaces them with corrected values from alternative signal paths or previous/next valid samples, thereby mediating between the AGC's dynamic range control and the glitch-free signal requirement.
2Object-generated harmful factors
If current glitch suppression schemes are used, then some glitch effects are reduced, but glitches are not completely eliminated and performance degradation persists
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors for glitch events, identifies affected samples, and applies corrections based on the detected glitch patterns. This closed-loop approach ensures that glitches are not just suppressed but completely eliminated, with the system adapting to different glitch scenarios and maintaining optimal performance.
Solution Approach 2:
The patent replaces traditional mechanical or simple electronic glitch suppression methods with a sophisticated digital signal processing approach. Instead of using hardware-based attenuation or filtering that may not completely eliminate glitches, the system uses digital detection, identification, and replacement of affected samples, achieving complete glitch elimination while maintaining signal integrity.
3Ease of operation
If AGC trigger/release points are implemented to control attenuation stages, then dynamic range management is achieved, but transient response non-ideality causes performance deterioration
Solution Approach 1:
The patent applies preliminary correction actions at the exact moments when AGC trigger or release events occur. By detecting these transition points and pre-processing or immediately correcting the affected samples, the system prevents performance deterioration before it can impact overall system reliability, while maintaining the ease of dynamic range control provided by AGC trigger/release mechanisms.
Data Source
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Figure 2A~2B
Figure 2C
AI summary
Various embodiments of the present disclosure provide a method for multi-antenna transmission. The method which may be performed by a communication device comprises determining first correlation information in response to interference to data on a first subset of multiple antenna branches of the communication device. The first correlation information may indicate at least correlation between the data on the first subset of the multiple antenna branches and data on a second subset of the multiple antenna branches which is not affected by interference. The method further comprises correcting the data on the first subset of the multiple antenna branches, based at least in part on the first correlation information.