Single-Channel Full-Duplex Wireless Node for Same-Frequency Operation
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Solution Overview
Problem
Current wireless systems face challenges in achieving continuous, simultaneous full-duplex operation on a single frequency channel, which is essential for efficient communication and supporting massive MIMO, as they require separate frequency or time slots for transmit and receive signals, leading to inefficiencies and limitations in spectrum usage.
Innovation Solution
The implementation of a Single-Channel Full-Time Duplex (SCFTD) system that enables continuous, simultaneous transmission and reception on the same frequency channel using unpaired spectrum, allowing for the separation of transmit and receive signals through decorrelation techniques and advanced communication processors, such as STAR architectures with non-reciprocal waveguides and optical modulators, to support massive MIMO operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate frequency or time slots are used for transmit and receive signals, then interference between signals is reduced, but spectrum utilization efficiency deteriorates and continuous full-duplex operation on a single channel is not achieved
Solution Approach 1:
The patent merges transmit and receive operations onto a single frequency channel by combining FDD and TDD approaches. The system uses paired spectrum bands with dynamic time-division multiplexing, allowing simultaneous full-duplex communication on one channel while managing self-interference through coordinated transmit-receive timing and signal processing techniques.
Solution Approach 2:
The system dynamically switches between transmit and receive modes on the same frequency channel using time-division principles, while maintaining continuous operation through rapid switching. This dynamic approach allows the system to adapt transmit-receive timing to channel conditions and data traffic requirements, achieving continuous full-duplex operation with controlled interference.
2Ease of operation
If paired spectrum bands are used for FDD operation, then simultaneous transmit and receive is enabled, but compatibility with massive MIMO systems deteriorates due to lack of channel state information reciprocity
Solution Approach 1:
The patent creates a universal system that achieves both FDD simultaneous transmit-receive capability and TDD channel reciprocity for massive MIMO. By using paired spectrum bands with dynamic time-division multiplexing and sophisticated signal processing, the system provides multi-functionality: it supports full-duplex operation like FDD while maintaining channel state information reciprocity like TDD, enabling compatibility with massive MIMO systems.
3Adaptability or versatility
If time division duplexing is used, then channel state information reciprocity is achieved for massive MIMO, but continuous simultaneous full-duplex operation deteriorates due to time slot separation requirements
Solution Approach 1:
The system maintains continuous useful action by enabling simultaneous transmit and receive operations on the same frequency channel. Through dynamic time-division multiplexing with rapid switching and sophisticated interference management, the system eliminates the interruptions inherent in traditional TDD, achieving continuous full-duplex operation while preserving channel state information reciprocity for massive MIMO compatibility.
Data Source
AI summary
A wireless single-frequency-channel, full-duplex, full-time transmit and receive communication node includes an antenna that transmits a transmit signal over a wireless transmit channel and that receives a receive signal over a wireless receive channel. A communications processor includes a first port electrically coupled to the antenna and a second port electrically coupled to a transmit path where the transmit path connects the second port to the first port. A third port of communications processor is electrically coupled to a receive path that connects the first port to the third port. The communications processor is configured to pass the transmit signal in the transmit path to the first port and configured to pass the receive signal in the receive path from the first port to the third port such that the transmit signal and the receive signal occupy a same frequency channel and operate simultaneously in a same time slot.