Full-Duplex Wireless Transceiver Signaling for Spectral Efficiency

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Solution Overview

Problem

Current wireless systems are limited by their half-duplex capability, which restricts simultaneous transmission and reception, leading to inefficiencies in spectral usage and network management, especially in multi-user scenarios where interference management and resource allocation become significant bottlenecks.

Innovation Solution

Implementing full-duplex wireless links that enable simultaneous transmission and reception over the entire frequency band, using techniques such as OFDMA, SDMA, and cognitive transmission to manage interference and allocate resources efficiently, while allowing for asynchronous and parallel communication channels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If full-duplex capability is implemented, then spectral efficiency and network quality of service are improved, but device complexity and interference management difficulty increase

Engineering Contradiction:

Improvespectral efficiencyVSAvoidinterference management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent introduces an intermediary signaling mechanism where nodes exchange channel state information and interference characteristics through dedicated control channels. This intermediary information exchange enables coordinated interference management without requiring complex centralized control, thus improving spectral efficiency while managing device complexity through distributed intelligence.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements feedback loops where receiving nodes measure interference levels and channel conditions, then feed this information back to transmitting nodes. This feedback enables dynamic adjustment of transmission parameters such as power control and resource allocation, allowing the system to adapt to changing interference conditions and maintain high spectral efficiency without excessive complexity.

Inventive Principle:

Principle #23Feedback

2Reliability

If full-duplex links are used in multi-user systems, then network quality of service and resource allocation efficiency are improved, but multi-user interference management becomes more difficult

Engineering Contradiction:

Improvenetwork quality of serviceVSAvoidmulti-user interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful multi-user interference into a beneficial resource by enabling nodes to use received interference signals as reference signals for channel estimation and interference cancellation. Instead of treating interference purely as noise to be suppressed, the system utilizes it to improve channel knowledge and coordinate transmissions, thereby maintaining high QoS while managing interference through constructive utilization.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent implements preliminary channel estimation and interference characterization before data transmission begins. By performing channel sounding and interference measurement in advance during dedicated reference signal periods, nodes acquire prior knowledge of channel conditions and interference patterns, enabling them to pre-coordinate resource allocation and power control to minimize multi-user interference impact on QoS.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If simultaneous transmission and reception over entire frequency band is enabled, then spectral efficiency increases, but signal detection and interference cancellation difficulty increase

Engineering Contradiction:

Improvespectral efficiencyVSAvoidsignal detection difficulty

Core Design Contradiction:

ProductivityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent segments the frequency band into multiple subcarriers or resource blocks that can be independently managed and detected. By dividing the broad frequency spectrum into smaller orthogonal segments using OFDM technology, the system enables parallel detection of multiple signals at different frequency segments, reducing the complexity of detecting and canceling self-interference and multi-user interference while maintaining high overall spectral efficiency.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11757604B2Distributed collaborative signaling in full duplex wireless transceivers

Publication Date: 2023.09.12 KHANDANI AMIR KEYVAN

AI summary

Two-way (full-duplex) wireless links in facilitating network management and improve network performance. Once aspect includes methods for network management using a high-throughput channel and a low-throughput channel. Other aspects include methods to facilitate practical realization and improve performance of some of the network information theoretic configurations, such as Space-Division Multiple Access (SDMA) in uplink and downlink, Interference Channel, and other forms of distributed collaborative signaling schemes. Another aspect includes methods to support cognitive wireless networks.