Multi-Channel RF Receiver Time Alignment Using Reference Signal Injection
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Solution Overview
Problem
Multi-channel receiving systems face challenges in achieving precise and efficient time-alignment between channels, leading to suboptimal performance due to differences in delays, which are difficult to calibrate accurately and rapidly.
Innovation Solution
A method involving the injection of an amplitude or phase modulated reference signal into each channel, detection of its position after analog-to-digital conversion, determination of propagation time difference and digital synchronization error, and adjustment of channels using interpolation filters and clock generation circuits to achieve synchronized time-alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional phase matching cables are used to achieve time-alignment between channels, then manufacturing precision can be improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical phase matching cables with a digital signal processing system. The method involves injecting a reference signal into each channel, detecting its position after analog-to-digital conversion, determining propagation time differences, and applying digital delay adjustments. This substitution eliminates the need for precise mechanical cable assemblies while achieving the same time-alignment function through software-based delay compensation.
Solution Approach 2:
The patent changes the approach from physical parameter adjustment (cable lengths) to digital parameter adjustment (sampling delays). By modifying the sampling rate and applying digital delay algorithms, the system achieves time-alignment without requiring precise physical cable matching. The delay values are calculated based on detected signal positions and applied as digital correction parameters.
2Measurement precision
If traditional calibration methods are used to achieve time-alignment, then measurement precision can be improved, but productivity decreases due to time-consuming calibration
Solution Approach 1:
The patent performs preliminary calibration by injecting a reference signal and detecting its position in each channel before actual operation. This preliminary action establishes the propagation time differences and enables subsequent real-time delay compensation. The calibration is performed once during system initialization or setup, after which the digital delay adjustments are applied continuously without requiring repeated manual calibration procedures.
Solution Approach 2:
The patent implements a feedback mechanism where the reference signal position is continuously monitored and used to adjust the delay parameters. The system detects the actual signal arrival time in each channel, compares it with the expected timing, and automatically compensates for deviations by adjusting digital delay values. This closed-loop feedback ensures accurate time-alignment while minimizing manual intervention and calibration time.
3Ease of manufacture
If analog phase matching methods are used, then ease of manufacture is improved, but adaptability decreases for different operating conditions
Solution Approach 1:
The patent transitions from static physical cable configurations to dynamic digital delay adjustments. The system can adaptively change delay parameters based on different operating conditions, antenna configurations, or environmental factors. The digital processing allows real-time modification of timing parameters without requiring physical reconfiguration of cables or hardware, providing superior adaptability while maintaining ease of initial assembly.
Data Source
AI summary
The present disclosure relates to a method for synchronizing time alignment in a multi-channel radio frequency receiving system, the method including injecting an amplitude modulated reference signal into each channel in the multi-channel receiver at a location associated with each antenna input. Further, the method includes the steps of detecting a position of the reference signal within a time sample window and determining propagation time difference between each channel within the receiver electronics. Further, the method includes the steps of determining adjustment parameters, for synchronizing time alignment, for each channel and adjusting the channels in the time domain in accordance with the determined adjustment parameters of synchronization for each channel.