Joint Linear Delay and Phase Compensation for Antenna Branches
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Solution Overview
Problem
Current methods for delay and phase compensation in multiple antenna branch radio systems separately estimate and compensate for delay and phase, often requiring up-sampling and cross-correlation operations, which are computationally intensive and do not effectively address phase estimation across multiple antenna branches.
Innovation Solution
The proposed solution involves designing orthogonal frequency domain multiplexed (OFDM) reference sequences with a long cyclic prefix, injected into separate antenna branches, where the received signals are processed in the frequency domain using a least squares based method to compute delay and phase rotation factors simultaneously, eliminating the need for time domain up-sampling and cross-correlation operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time domain up-sampling and cross-correlation operations are used for delay estimation, then measurement precision is improved, but device complexity and computational time increase
Solution Approach 1:
The patent replaces the mechanical/time-domain processing approach (up-sampling and cross-correlation) with a frequency-domain mathematical approach (least squares estimation). Instead of performing computationally intensive time-domain operations, the invention uses frequency domain signal processing where delay estimation is achieved through phase slope analysis and linear regression, significantly reducing computational complexity while maintaining or improving precision.
Solution Approach 2:
The invention changes the domain of operation from time domain to frequency domain. By transforming the delay estimation problem into the frequency domain, the patent enables the use of phase information and linear regression techniques that are computationally more efficient. The parameter transformation involves using phase slope with respect to frequency to estimate delay, rather than performing time-domain correlation operations.
2Ease of operation
If delay and phase compensation are performed separately, then ease of operation is maintained, but measurement precision and compensation accuracy deteriorate
Solution Approach 1:
The patent merges the separate delay and phase compensation operations into a unified joint estimation and compensation process. By simultaneously estimating both delay and phase parameters using frequency domain analysis and least squares methods, the invention achieves higher compensation accuracy while maintaining operational simplicity through a single integrated algorithm rather than multiple separate processing stages.
Solution Approach 2:
The frequency domain least squares estimation method serves multiple functions simultaneously: it estimates delay parameters, estimates phase parameters, and provides compensation information for both parameters in a single operational framework. This multi-functional approach eliminates the need for separate processing chains while improving overall measurement precision and compensation accuracy.
Data Source
AI summary
A method, network node and system for providing joint phase and delay compensation for a plurality of antenna branches in a network node having a plurality of antennas by processing injected signals and feedback signals in a frequency domain are provided. According to one aspect, a method includes performing at least squares algorithm applied to the injected signals and the feedback signals to generate corrective signals applied to input signals of each antenna branch.