FBMC Signal Detection Using Interference Patterns for Time Offset
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G wireless communication systems, determining a time offset is challenging due to Inter Symbol Interference (ISI) and Inter-User Interference (IUI), which causes performance degradation from different propagation delays between users, especially in Filter Bank MultiCarrier (FBMC) systems that do not use a Cyclic Prefix (CP).
Innovation Solution
A method and apparatus for a base station to determine a time offset using ISI of FBMC symbols, compensating for IUI, and adjusting the detection interval to minimize performance degradation, involving a communication unit for interference determination and a control unit for synchronization point optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FBMC system transmits signals without Cyclic Prefix to increase spectral efficiency, then spectral efficiency is improved, but time offset determination becomes difficult due to ISI and IUI
Solution Approach 1:
The patent converts the harmful ISI and IUI effects into useful information for time offset estimation. By analyzing the interference patterns between symbols and users in the received signal, the system determines time offsets and synchronization points, transforming what would normally be detrimental interference into a useful measurement mechanism for maintaining synchronization in FBMC systems.
2Productivity
If base station receives signals from multiple terminals with different propagation delays, then system capacity is improved, but detection accuracy degrades due to varying time offsets
Solution Approach 1:
The patent segments the time offset estimation process into multiple stages: first estimating time offsets for individual users based on their signal characteristics, then determining a common synchronization point that accounts for all users' different time offsets. This segmentation allows the system to handle multiple terminals with varying propagation delays while maintaining detection accuracy for each user.
Solution Approach 2:
The patent dynamically adjusts detection parameters based on the determined time offsets and synchronization points. By changing the detection timing and window parameters according to the estimated time offsets, the system optimizes signal detection accuracy for each terminal while accommodating the different propagation delays present in multi-user environments.
3Measurement precision
If base station determines time offset for each terminal individually, then time offset accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent merges the individual time offset estimation processes into a unified approach. By analyzing the interference patterns across multiple users' signals simultaneously and determining a common synchronization point that works for all users, the system reduces the computational complexity compared to completely independent estimation for each user, while still achieving accurate time offset determination for each terminal.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A method for operating a base station in a wireless communication system according to an embodiment includes determining interference between symbols of a signal received from at least one terminal, determining a time offset of the received signal based on the determined interference, and determining a detection interval of the signal received from the at least one terminal based on the time offset.