MIMO SCFD Transceiver EBD and Circulator Isolation
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Solution Overview
Problem
Conventional full-duplex front-end circuits for MIMO wireless systems face challenges with self-interference and insertion loss, particularly in same channel full duplex (SCFD) systems, where signal leakage from transmitting streams worsens interference, and existing solutions suffer from power consumption, reliability, and complexity issues.
Innovation Solution
A transceiver system utilizing an electrical balance based duplexer (EBD) coupled with circulators to provide wideband isolation between transmitting and receiving signals in a 2×2 MIMO SCFD front-end, allowing for independent spatial stream transmission and reception without insertion loss, and incorporating a reciprocal antenna coupling for cross-talk cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electrical balance based duplexer (EBD) is used to suppress self-interference, then isolation between transmitting and receiving signals is improved, but insertion loss occurs in Tx and Rx paths
Solution Approach 1:
The patent introduces circulators as intermediary devices to replace the traditional EBD balance network. The circulators provide Tx-Rx isolation without the insertion loss associated with EBD balance networks, serving as a mediator that enables full-duplex operation while preserving signal integrity in both transmit and receive paths.
Solution Approach 2:
The patent substitutes the electrical balance network (mechanical/electrical system) with a circulator-based isolation mechanism. This replacement eliminates the insertion loss problem inherent in EBD while maintaining the essential function of isolating transmitting and receiving signals in the full-duplex system.
2Object-affected harmful factors
If conventional methods are used to isolate TX paths from RX paths, then interference isolation is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent merges the functions of signal isolation and full-duplex operation into a unified circulator-based architecture. By combining multiple functions (isolation, signal routing, and full-duplex capability) into the circulator components, the system achieves effective interference isolation without the complexity of separate conventional isolation circuits.
3Object-affected harmful factors
If both antennas transmit and receive single spatial stream, then isolation between streams is improved, but spatial multiplexing capability is reduced
Solution Approach 1:
The patent enables dynamic spatial stream configuration where the system can adaptively allocate transmit and receive streams across multiple antennas. The circulator-based architecture allows flexible switching between different spatial stream configurations, enabling both isolation and multiplexing capabilities depending on operational requirements.
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
The proposed system achieves effective interference cancellation and reduced cross-talk, enabling reliable full-duplex operation with wideband isolation and minimizing the number of coupling networks required, thus improving power efficiency and system integrity.
Implementation Method 1
The at least one antennas is configured to transmit first signals and the at least one antennas is configured to receive second signals using at least one circulators. The EBD is configured to provide an isolation between the transmitting signals and the receiving signals in a same channel full duplex (SCFD) front-end circuit using the at least one circulators.
Implementation Method 2
The EBD is configured to provide an isolation between the transmitting signals and the receiving signals in a same channel full duplex (SCFD) front-end circuit using the at least one circulators. The EBD is configured to provide the isolation between the transmitting signals and the receiving signals in the SCFD front-end circuit using the at least one circulators by passing transmitting signals and the receiving signals at a first port from the plurality of ports and at a second port from the plurality of ports through the at least one circulators.
Implementation Method 3
The at least one antennas is configured to transmit first signals and the at least one antennas is configured to receive second signals
Data Source
AI summary
Embodiments herein provide a transceiver system 1000a-1000f for full-duplex communication. The transceiver system 1000a-1000f includes an electrical balance based duplexer (EBD) 100 coupled with at least one transceiver 200a and 200b and at least one antenna 300a and 300b. The at least one antenna 300a and 300b is configured to transmit first signals and the at least one antennas 300a and 300b is configured to receive second signals using at least one circulators. The EBD 100 is configured to provide an isolation between the transmitting signals and the receiving signals in a same channel full duplex (SCFD) front-end circuit using the at least one circulators.