De-ICI Filter Estimation With Flexible PT-RS Placement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for compensating inter-carrier interference (ICI) in wireless communication systems, particularly at high frequencies above 52.6 GHz, face challenges due to the need for high computational complexity and restrictions on phase tracking reference signal (PT-RS) placement, limiting their effectiveness in mitigating ICI.
Innovation Solution
A low-complexity method for estimating a de-ICI filter using phase tracking reference signal (PT-RS) symbols positioned in arbitrarily chosen subcarriers, enabling direct estimation in the frequency domain, with optional constraints to improve accuracy, applicable to single and multiple antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ICI compensation methods are used, then ICI suppression performance is improved, but computational complexity increases significantly
Solution Approach 1:
The patent changes the parameter of PT-RS placement from conventional restricted positions to arbitrary subcarrier positions. This parameter change enables the use of flexible ICI filter estimation methods that reduce computational complexity while maintaining suppression performance through optimized filter design adapted to arbitrary reference signal locations
Solution Approach 2:
The patent applies local quality by designing ICI filters with specific constraints tailored to different regions of the frequency domain. The filter design incorporates local characteristics of the channel and interference patterns at different subcarrier positions, allowing efficient computation while maintaining high suppression performance in critical regions
2Measurement precision
If PT-RS placement is restricted to conventional positions, then estimation accuracy is improved, but system flexibility deteriorates
Solution Approach 1:
The patent introduces dynamics by allowing PT-RS to be placed at arbitrary subcarrier positions that can adapt to different channel conditions and system requirements. The ICI filter estimation method dynamically adjusts to these arbitrary positions while maintaining accuracy through constrained optimization techniques that ensure reliable estimation regardless of reference signal location
Solution Approach 2:
The patent segments the frequency domain into different regions and applies specialized ICI filter estimation techniques for each region. This segmentation allows the system to handle arbitrary PT-RS placements by treating different subcarrier regions independently, maintaining estimation accuracy while providing flexibility in reference signal positioning
3Productivity
If high-frequency operation above 52.6 GHz is implemented, then data rate capacity is improved, but ICI interference increases
Solution Approach 1:
The patent replaces conventional ICI compensation mechanisms with a new approach based on arbitrary PT-RS placement and constrained ICI filter estimation. This substitution enables effective ICI mitigation at high frequencies by using flexible reference signal positioning combined with optimized filtering, achieving both high data rates and low interference
Data Source
AI summary
According to some embodiments, a method performed by a wireless device comprises receiving a wireless signal Rk over all subcarriers allocated to the wireless device. The signal Rk comprises a phase tracking reference signal (PT-RS) on a subset of subcarriers allocated to the wireless device and the subset comprises at least one non-contiguous subcarrier. The method further comprises computing a de-inter-carrier interference (ICI) filter based on the PT-RS and a channel estimate using a convolutional matrix CR of the received signal Rk and applying the de-ICI filter to the received signal Rk to generate a de-ICI filtered signal.