Sub-Band Full-Duplex Transceiver Filtering for Interference Suppression
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Solution Overview
Problem
Existing communication systems face challenges in managing cross-link interference and self-interference in sub-band full duplex (SBFD) operations, particularly in the 6 GHz frequency band, where simultaneous transmission and reception occur, due to limitations in RF filtering and interference suppression.
Innovation Solution
Implementing a transceiver arrangement with bandpass filters and circulators or duplexers to separate frequency resources by a guard band, allowing for simultaneous transmission and reception in different time slots, and using RF filtering to isolate uplink and downlink sub-bands effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous transmission and reception occur in sub-band full duplex operations, then spectrum efficiency is improved, but cross-link interference and self-interference increase
Solution Approach 1:
The frequency band is segmented into multiple sub-bands, with transmission and reception occurring in different sub-bands simultaneously. This segmentation allows full duplex operation while reducing interference through frequency separation, directly addressing the contradiction between spectrum efficiency and interference levels.
2Object-affected harmful factors
If RF filtering is used to separate frequency resources, then interference suppression is improved, but device complexity increases
Solution Approach 1:
Bandpass filters are introduced as intermediary components between the antenna and the transceiver circuitry. These filters act as mediators that selectively pass desired frequency bands while blocking interfering signals, thereby improving interference suppression while managing the added complexity through standardized filter components.
3Object-affected harmful factors
If guard band is introduced to separate frequency resources, then interference between sub-bands is reduced, but frequency resource utilization decreases
Solution Approach 1:
The guard band parameters (frequency position, bandwidth) are optimized to achieve the minimum necessary separation between sub-bands. By carefully adjusting these parameters, the system reduces interference between sub-bands while minimizing the spectral gap, thereby maintaining high frequency resource utilization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach achieves significant interference suppression, enabling efficient simultaneous transmission and reception with up to 100 dB interference cancellation, suitable for both licensed and unlicensed technologies in the 6 GHz frequency band.
Implementation Method 1
Implementing a transceiver arrangement with bandpass filters and circulators or duplexers to separate frequency resources by a guard band
Implementation Method 2
Implementing a transceiver arrangement with bandpass filters and circulators or duplexers
Implementation Method 3
Implementing a transceiver arrangement with bandpass filters and circulators or duplexers
Data Source
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AI summary
An apparatus comprising: means for transmitting one or more signals in one or more first time slots on a first frequency resource to one or more user equipment; and means for receiving one or more signals in one or more second time slots on the first frequency resource from one or more user equipment, and for receiving one or more signals in one or more third time slots on a second frequency resource, the first and second frequency resources being separated by a guard band, wherein the one or more first time slots are different to the one or more second time slots, one or more of the first time slots are the same as one or more of the third time slots.