Subarray Phase Equalization for Low-SINR Doppler Compensation
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Solution Overview
Problem
Conventional multi-channel DFEs face challenges in accurately estimating Doppler frequency in low signal-to-interference-plus-noise ratio (SINR) environments, leading to poor demodulation performance due to phase detection inaccuracies.
Innovation Solution
Grouping receivers into subarrays with strong Doppler frequency correlations and averaging phase amounts within each subarray to improve phase detection accuracy through a unified DPLL for each subarray, enhancing phase compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent DPLL is performed for each reception channel, then the system can operate without problems even if Doppler frequency fluctuations differ across channels, but phase detection accuracy deteriorates in low SINR environments
Solution Approach 1:
The patent merges multiple independent DPLL operations into a unified DPLL that processes signals from multiple reception channels simultaneously. By combining the phase detection processes and sharing computational resources, the system achieves both improved phase detection accuracy through signal integration and maintained operational reliability through centralized control.
Solution Approach 2:
The patent segments the reception channels into groups that are processed by the unified DPLL. This segmentation allows the system to manage multiple channels efficiently while maintaining the ability to handle different Doppler frequency fluctuations across channels, resolving the contradiction between reliability and precision.
2Device complexity
If conventional DPLL is used in low SINR environments, then the system structure remains simple, but demodulation performance deteriorates due to incorrect Doppler frequency estimation
Solution Approach 1:
The unified DPLL combines signals from multiple reception channels to improve the signal-to-interference-plus-noise ratio during phase detection. This merging of signals enhances Doppler frequency estimation accuracy in low SINR environments without requiring complex additional hardware, thus improving demodulation performance while maintaining relatively simple system structure.
Solution Approach 2:
The unified DPLL implements feedback mechanisms that utilize information from multiple channels to refine phase detection. This feedback approach allows the system to correct estimation errors and improve demodulation performance in low SINR conditions without significantly increasing system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed method improves demodulation performance by reducing noise influence and stabilizing phase compensation, even in low SNR conditions.
Implementation Method 1
performing, on the reception signal, phase rotation processing of a phase rotation amount calculated for the subarray to which the element that has received the reception signal belongs
Implementation Method 2
averaging phase amounts of the signals received by the elements belonging to the subarray for each of the subarrays, and calculating the phase rotation amount for performing phase compensation by the phase rotation processing using the averaged phase amount
Implementation Method 3
performing equalization processing on the reception signal subjected to the phase rotation processing
Implementation Method 4
The adaptive equalizer uses the DPLL to adaptively compensate for Doppler frequency fluctuations caused by external factors such as ship rocking
Data Source
AI summary
A receiving system includes one or more subarrays, a phase rotation unit, an equalization unit, and a calculation unit. The subarray includes a set of a plurality of elements having a strong correlation in a Doppler frequency transition. The phase rotation unit performs, on a reception signal received by each element of the subarray, phase rotation processing of a phase rotation amount calculated for the subarray to which the element that has received the reception signal belongs. The equalization unit performs equalization processing on the reception signal subjected to the phase rotation processing. The calculation unit averages phase amounts of the signals received by the elements belonging to the subarray for each subarray, and calculates the phase rotation amount for performing phase compensation using the averaged phase amount.