Dual-Path Repeater Switching for TDD Signal Isolation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing duplexing schemes to separate uplink and downlink signals, leading to interference and reduced signal quality, particularly in time division duplex (TDD) systems.
Innovation Solution
A dual path switchable repeater is introduced, utilizing circulators and software-defined filters to provide isolation and filtering between uplink and downlink signals, allowing for efficient switching and amplification of TDD signals based on 3GPP and 5G NR standards, with configurations adaptable to various frequency bands and channel bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time division duplex (TDD) switching is used to separate uplink and downlink signals, then signal quality can be improved, but interference between uplink and downlink signals occurs during switching transitions
Solution Approach 1:
A dual path architecture with separate uplink and downlink signal paths acts as an intermediary structure. Each path includes dedicated amplification and filtering components, preventing direct interference between uplink and downlink signals while maintaining signal quality through isolated processing channels.
Solution Approach 2:
The repeater is divided into two independent signal paths: an uplink path and a downlink path. Each path is independently configured with its own amplification and filtering stages, allowing simultaneous processing of uplink and downlink signals without mutual interference, thus resolving the contradiction between signal quality and interference.
2Reliability
If amplification is applied to enhance signal strength, then signal quality improves, but noise and distortion are also amplified
Solution Approach 1:
Filtering is applied before amplification in both uplink and downlink paths. This preliminary filtering action removes noise and unwanted frequency components from the signals before they enter the amplification stage, ensuring that only clean signals are amplified. This prevents the amplification of noise and distortion while still enhancing the desired signal strength.
Solution Approach 2:
Dedicated filtering components are positioned as intermediaries between the signal input and amplification stages. These filters selectively pass desired frequency ranges while blocking noise and distortion, allowing amplification to occur on clean signals only, thus improving signal strength without proportionally amplifying noise and distortion.
3Reliability
If filtering is applied to remove interference, then signal quality improves, but signal bandwidth is reduced
Solution Approach 1:
Different filtering characteristics are applied to different frequency ranges within the signal band. The filtering is designed to target specific interference frequencies while preserving the majority of the useful signal bandwidth. This local quality approach allows selective removal of interference components without unnecessarily reducing the overall signal bandwidth, maintaining both signal quality and bandwidth efficiency.
Data Source
AI summary
A technology is described for a dual path repeater configurable for a split mode and a multiple input multiple output (MIMO) mode. The dual path repeater can comprise first and second server ports and first and second donor ports. Four amplification and filtering paths are communicatively coupled between the ports. Each amplification and filtering path include a software defined filter (SDF). The SDFs are configured to filter the same 3GPP bands to provide MIMO communication or the first SDF and the second SDF are configured to filter different bands to enable the dual path switchable repeater to provide split mode communication on multiple TDD/FDD bands.