Full-Duplex Wireless Communication Using Butler Matrix Beamforming
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving efficient full-duplex communication at base stations, as they often require different frequency resources for uplink and downlink communications, limiting the utilization of wireless communication resources.
Innovation Solution
The implementation of beamforming techniques at base stations allows for concurrent transmission and reception using the same time and frequency resources, enabling full-duplex communication by combining multiple physical antennas into virtual antennas and configuring amplitude gain and phase offsets for directional beams, utilizing a Butler matrix for signal filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different frequency resources are used for uplink and downlink communications, then interference between simultaneous transmissions is avoided, but wireless communication resource utilization is limited
Solution Approach 1:
The patent transitions from frequency-domain separation to spatial-domain separation by introducing beamforming technology. Instead of using different frequency resources for uplink and downlink, the system uses directional beams with different spatial orientations to separate the communication channels, thereby achieving full-duplex communication on the same frequency resources without causing interference
Solution Approach 2:
The patent changes the separation parameter from frequency to spatial direction. By adjusting beamforming parameters such as beam direction, width, and power distribution in the spatial domain, the system enables simultaneous uplink and downlink transmissions on identical frequency resources while maintaining signal quality and avoiding interference through precise spatial filtering
2Productivity
If full-duplex communication is implemented using the same frequency resources, then resource utilization efficiency is improved, but self-interference between transmit and receive signals increases
Solution Approach 1:
The patent applies local quality by creating highly directional beams that concentrate transmission energy in specific spatial directions. This spatial selectivity ensures that transmit and receive beams are oriented in different directions, reducing the overlap and interference between simultaneous transmissions and receptions on the same frequency resources
Solution Approach 2:
The patent converts the potential harmful self-interference into a beneficial spatial filtering mechanism. By using beamforming, the system deliberately shapes the transmit and receive patterns to exploit spatial separation, turning what could be interference into a means of channel isolation and enabling full-duplex operation
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 enhances the efficiency of wireless communication resources by enabling simultaneous uplink and downlink communications over the same frequency resources, improving the overall performance and capacity of wireless networks.
Implementation Method 1
utilizing a Butler matrix for signal filtering
Implementation Method 2
receiving, from a user equipment (UE), a first signal communicated via a first directional receive beam
Data Source
AI summary
Certain aspects of the present disclosure provide systems and techniques for full-duplex communication. A first system is characterized by techniques for communicating in full-duplex utilizing the Butler matrix beamformer for generating a spatial beam to be used for both uplink and downlink signaling, wherein the signaling utilizes the same time and frequency resources. A second system is characterized by techniques for communicating in full-duplex utilizing the Butler matrix beamformer to generate two spatial beams, one to be used for downlink and one to be used for uplink signaling, wherein the signaling utilizes the same time and frequency resources. Accordingly, the systems and techniques described herein are directed to low complexity, multi-user full-duplex communications.