Reconfigurable TDD-FDD Multiplexer for Wireless Backhaul
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Solution Overview
Problem
Existing wireless backhaul communication systems require separate duplexers for time-division duplexing (TDD) and frequency-division duplexing (FDD) modes, limiting their ability to operate efficiently in both modes simultaneously.
Innovation Solution
A reconfigurable multiplexer system that includes interdigital quadruplexers and a one-pole three-throw RF switch, allowing operation in both TDD and FDD modes by switching between V-band and E-band frequency ranges, enabling simultaneous transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate duplexers are used for TDD and FDD modes, then each mode can operate independently, but the system complexity increases and the ability to operate efficiently in both modes simultaneously is limited
Solution Approach 1:
The patent combines TDD and FDD duplexing functionalities into a single integrated duplexer unit. The device includes TDD switch elements (first and second switches) and FDD switch elements (third and fourth switches) all contained within one duplexer structure, allowing both TDD and FDD modes to operate simultaneously through coordinated switching operations rather than requiring separate independent duplexers
Solution Approach 2:
The integrated duplexer is designed to perform multiple functions: it can operate in TDD mode using the first and second switches, in FDD mode using the third and fourth switches, and support both modes concurrently. This multi-functional design allows a single device to replace what would traditionally require separate specialized duplexers for each mode
2Adaptability or versatility
If a single integrated duplexer supports both TDD and FDD modes, then adaptability improves, but the switching control complexity increases
Solution Approach 1:
The patent implements dynamic switching control where the duplexer can adapt its configuration in real-time based on operational requirements. The first and second switches for TDD mode and third and fourth switches for FDD mode can be independently controlled and switched dynamically, allowing the system to transition between modes and operate both simultaneously as conditions change
Solution Approach 2:
The control system is segmented into independent switching control mechanisms for different modes. The TDD switching control for the first and second switches operates independently from the FDD switching control for the third and fourth switches, allowing each mode to be controlled separately while maintaining overall system coordination through the integrated duplexer architecture
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
Enables seamless switching between TDD and FDD modes, enhancing communication efficiency in wireless backhaul systems by integrating both duplexing functionalities into a single compact architecture.
Implementation Method 1
a first band pass filter having a first frequency passband and a first port for coupling to a first transmitter, a second band pass filter having a second frequency passband and a first port for coupling to a second transmitter, a third band pass filter having a third frequency passband that is offset from the second frequency passband
Implementation Method 2
a switch for coupling an antenna to a second port of the first band pass filter in a first switch position, both a second port of the second band pass filter and a second port of the third band pass filter in a second switch position, and a second port of the fourth band pass filter in a third switch position
Data Source
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AI summary
A reconfigurable TDD-FDD multiplexer operates in a TDD mode and a FDD mode. The TDD-FDD multiplexer includes an interdigital quadruplexer in series with a one-pole three-throw RF switch. The interdigital quadruplexer includes of two V-band filters, connectable to a transmitter and a receiver, respectively, for TDD mode duplexing, and two E-band filters, connectable to a transmitter and a receiver, respectively, for FDD mode duplexing. The E-band filters include an E-band transmitting filter that passes an E-band transmitting frequency band, and an E-band receiving filter that passes for an E-band receiving frequency band offset from the E-band transmitting frequency band. Switching between the V-band receiving filter and V-band transmitting filter enables TDD duplexing functionality at V-band frequencies. Switching to the two E-band filters enables FDD duplexing functionality at E-band frequencies.