Signal Trajectory Correction for Low-Magnitude Event Bandwidth Control
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Solution Overview
Problem
Existing communication signal modulators face challenges in managing low-magnitude events, which lead to increased bandwidth and processing costs, spectral regrowth, and error vector magnitude (EVM) issues, particularly in modern mobile communication technologies like UMTS and HSDPA, where prior methods are limited to symbol rate conditioning and fail to adequately address phase bandwidth.
Innovation Solution
A method that analyzes low-magnitude events in signal trajectories and generates correction impulses with specific magnitudes and phases to combine with the original signal, altering the signal trajectory to avoid low-magnitude events without significantly increasing EVM or degrading power spectral density (PSD) and adjacent channel leakage ratio (ACLR, using a digital signal processor to implement the signal conditioner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If symbol rate conditioning is used to manage low-magnitude events, then processing complexity is reduced, but bandwidth control and EVM performance deteriorate
Solution Approach 1:
The patent applies preliminary action by detecting low-magnitude events in advance within a symbol period and applying correction impulses before the events adversely affect signal quality. The system identifies data points with magnitude below a threshold and generates correction impulses that are combined with the original signal trajectory, preventing bandwidth expansion and EVM degradation before they occur.
Solution Approach 2:
The patent changes signal parameters by modifying the magnitude and phase of data points through correction impulses. When a low-magnitude event is detected, the system adjusts the signal trajectory by adding correction impulses with specific magnitudes and phases, thereby changing the signal parameters to achieve better bandwidth control and reduced EVM while maintaining signal integrity.
2Manufacturing precision
If correction impulses are applied to eliminate low-magnitude events, then bandwidth control improves, but error vector magnitude increases
Solution Approach 1:
The patent changes signal parameters by modifying the magnitude and phase of data points through correction impulses. When a low-magnitude event is detected, the system adjusts the signal trajectory by adding correction impulses with specific magnitudes and phases, thereby changing the signal parameters to achieve better bandwidth control and reduced EVM while maintaining signal integrity.
Solution Approach 2:
The patent employs feedback by continuously monitoring the signal trajectory for low-magnitude events and dynamically adjusting the correction impulses based on the detected conditions. The system uses the original signal characteristics to generate appropriate correction impulses, creating a closed-loop system that optimizes bandwidth control while minimizing EVM impact through adaptive correction.
3Device complexity
If prior art methods are used for low-magnitude event management, then implementation is simpler, but spectral regrowth and ACLR performance worsen
Solution Approach 1:
The patent applies preliminary action by detecting low-magnitude events in advance within a symbol period and applying correction impulses before the events adversely affect signal quality. The system identifies data points with magnitude below a threshold and generates correction impulses that are combined with the original signal trajectory, preventing bandwidth expansion and EVM degradation before they occur.
Data Source
AI summary
Methods and apparatus for conditioning low-magnitude events in electrical signals. According to an exemplary method, a low-magnitude event occurring in a signal trajectory of a received electrical signal is analyzed. The low-magnitude event is defined by a data point on a signal trajectory having a magnitude that is less than a predetermined signal magnitude minimum. A correction impulse having a correction magnitude and a correction phase is generated based on the magnitude and phase of data points on the signal trajectory that occur prior to and after the occurrence of the low magnitude event. The correction impulse is combined with the original electrical signal in the temporal vicinity of the low-magnitude event, thereby generating a corrected electrical signal having a more controlled bandwidth.