Joint Channel and Frequency Offset Estimation for Microwave Systems
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Solution Overview
Problem
Current methods are inadequate for effectively addressing carrier frequency offset in high-frequency microwave communication systems, which is critical due to the independence of transmitter and receiver carriers in distributed MIMO architectures, leading to synchronization issues and reduced system accuracy and stability.
Innovation Solution
A method that combines channel estimation and frequency offset estimation, calculating residual frequency offset information by dividing phase differences by time intervals and adding previous frequency offset information to correct for frequency offsets, thereby eliminating residual offsets and improving system stability without separate frequency offset estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate channel estimation and frequency offset estimation methods are used, then the system can handle low carrier frequency offsets, but the method becomes inadequate for high-frequency microwave communication systems with serious carrier frequency offset
Solution Approach 1:
The patent combines channel estimation and frequency offset estimation into a unified joint estimation method. The receiver simultaneously estimates both channel response and frequency offset by processing the received signal through a combined estimation algorithm, rather than performing separate estimation steps. This integration allows the system to effectively handle high carrier frequency offsets in microwave communication systems while maintaining accuracy in channel parameter estimation.
2Ease of operation
If distributed MIMO architecture is adopted, then the system achieves high compatibility and ease of installation, but carrier independence between transmitter and receiver causes serious synchronization problems
Solution Approach 1:
The patent implements a feedback mechanism where the receiver performs joint channel and frequency offset estimation, then uses the estimated frequency offset information to correct the received signal. The corrected channel estimation results are fed back to improve subsequent signal detection and demodulation. This closed-loop approach compensates for the carrier frequency offset caused by independent oscillators in distributed MIMO, thereby maintaining synchronization stability while preserving the architectural benefits of distributed deployment.
3Measurement precision
If traditional wireless communication methods are used, then low carrier frequency offset can be managed, but the methods are not applicable to high-frequency microwave communication systems
Solution Approach 1:
The patent modifies the estimation algorithm parameters and mathematical models to accommodate high carrier frequencies in microwave systems. The joint estimation method uses frequency-offset-aware channel estimation techniques that account for the larger frequency deviations typical in high-frequency systems. By adjusting the estimation parameters and using appropriate signal processing models designed for high-frequency operation, the system achieves accurate frequency offset estimation and channel characterization across the microwave frequency range.
Data Source
AI summary
Embodiments of the present invention provide a method, includes: performing channel estimation on a signal of a current channel to obtain channel information of the current channel, performing calculation processing on the channel information obtained in current channel estimation and channel information obtained in previous channel estimation to obtain a phase difference of the current channel information, dividing the phase difference of the current channel information by a time interval between two times of channel estimation to obtain residual frequency offset information of the current channel, adding the residual frequency offset information of the current channel and frequency offset information which is of the channel and obtained in a previous calculation to obtain frequency offset information of the current channel, and outputting the frequency offset information of the current channel, so as to perform frequency offset correction on the signal of the channel according to the current frequency offset information.