Non-Orthogonal Waveform Interference Component Construction for Channel Estimation
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Solution Overview
Problem
In 5G communication systems, the use of non-orthogonal waveforms in multi-carrier systems leads to increased inter-symbol and inter-carrier interference, making channel estimation more challenging and reducing frequency efficiency due to the longer symbol length and guard band requirements, which existing technologies have not adequately addressed.
Innovation Solution
A method and apparatus for constructing an interference component using detected data symbols and estimated channel responses in a non-orthogonal system, involving iterative processes to reconstruct and re-estimate the channel state, allowing for improved channel estimation and reduced interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a non-orthogonal waveform is used in multi-carrier systems, then frequency efficiency is improved and guard band requirements are reduced, but inter-symbol interference and inter-carrier interference increase
Solution Approach 1:
The patent converts the harmful interference caused by non-orthogonal waveforms into a beneficial signal component. By treating inter-symbol interference and inter-carrier interference as useful signals that contain channel information, the system performs channel estimation using these interference components. This transforms what was previously a detrimental effect into a resource for improving channel estimation accuracy and overall system performance.
Solution Approach 2:
The patent introduces an intermediary approach by using detected data symbols and estimated channel responses as intermediate components to construct the interference signal. This intermediary construction process allows the system to separate and manage different interference components systematically, enabling accurate channel estimation while maintaining the frequency efficiency benefits of non-orthogonal waveforms.
2Measurement precision
If iterative interference reconstruction and channel re-estimation is performed, then channel estimation accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent applies partial iteration by performing interference reconstruction and channel re-estimation for a limited number of times rather than continuously. This partial action approach achieves sufficient channel estimation accuracy improvement while avoiding the excessive computational burden of unlimited iterative processing. The system balances the trade-off between accuracy enhancement and computational complexity by implementing a controlled iterative process.
Data Source
AI summary
A system and method for constructing an interference component using a detected data symbol and an estimated channel response in a non-orthogonal system and a method of estimating a channel using a structure of the non-orthogonal system and the interference component are provided. The system includes a receiver that receives a reference signal and data transmitted from a transmitter; detects adjacent data symbols around the reference signal; estimates an initial channel state; constructs the interference signal based on the adjacent data symbols and the initial channel state; estimates the channel state on the basis of the constructed interference signal; and perform an iterative process of reconstructing the interference signal based on the basis of the estimated channel state and re-estimates the channel state based on the reconstructed interference signal.