Full-Duplex Mesh Network Transceiver Self-Interference Cancellation
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Solution Overview
Problem
Current mesh network base stations require separate frequency bands for access and backhaul communication, limiting efficiency and increasing interference, while existing self-interference cancellation techniques are not optimized for single-band operations.
Innovation Solution
Implementing self-interference cancellation technology in mesh network transceivers to enable full-duplex communication on a single frequency band, allowing both access and backhaul operations using a single antenna, with each transceiver node equipped with a self-interference cancellation circuit to reduce radio frequency interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If separate frequency bands are used for access and backhaul communication, then interference between transmissions is reduced, but spectral efficiency and resource utilization deteriorate
Solution Approach 1:
The patent merges access and backhaul communications into a single frequency band by implementing full-duplex operation. The base station simultaneously transmits to and receives from user equipment on the same frequency, eliminating the need for separate frequency bands and thereby improving spectral efficiency while managing interference through self-interference cancellation techniques
Solution Approach 2:
The patent converts the harmful self-interference effect into a beneficial solution by measuring and characterizing the interference channel, then using this knowledge to cancel the self-interference through signal processing. This allows the system to operate in-band full-duplex mode, turning what was previously a fundamental limitation into an enabler for higher spectral efficiency
2Reliability
If multiple antennas and frequency bands are used for access and backhaul, then communication reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes a single antenna and frequency band perform multiple functions by enabling in-band full-duplex operation. The same antenna and frequency resource are used for both access and backhaul communications, reducing hardware complexity while maintaining communication reliability through advanced signal processing and self-interference cancellation
Solution Approach 2:
The patent combines access and backhaul functions into a single radio frequency chain, eliminating the need for separate antennas and frequency bands. This merging reduces device complexity and cost while maintaining reliability through full-duplex operation and self-interference management
3Productivity
If self-interference cancellation is implemented, then in-band full-duplex communication is enabled, but signal processing complexity increases
Solution Approach 1:
The patent performs preliminary characterization of the self-interference channel during calibration phases, storing the interference channel information for later use. This preliminary action allows the system to quickly cancel self-interference during operation without requiring complex real-time processing, thereby enabling full-duplex communication with manageable signal processing complexity
Solution Approach 2:
The patent implements feedback mechanisms where the received signal is processed to estimate the self-interference component, which is then subtracted from the received signal. This feedback-based cancellation approach enables in-band full-duplex operation by continuously compensating for self-interference, thereby improving throughput while keeping signal processing complexity manageable through iterative refinement
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 significantly increases throughput, reduces the need for multiple antennas and frequency bands, and enhances network performance by enabling simultaneous transmission and reception on the same band, achieving up to 110 dB of self-interference cancellation and doubling the speed of half-duplex transmissions.
Implementation Method 1
each transceiver of each transceiver node performing self-interference cancellation to send and receive full duplex data on the single frequency band
Data Source
AI summary
Systems and methods relating to full duplex mesh networks are disclosed. In one embodiment, a mesh network comprising a first base station may be disclosed, the first base station comprising: a first transceiver for transmitting and receiving to and from the first base station on the single frequency band; and a second transceiver for transmitting and receiving to and from a second base station on the single frequency band, each transceiver of each transceiver node performing self-interference cancellation to send and receive full duplex data on the single frequency band at substantially the same time, thereby enabling the creation of a mesh network with at least one transceiver node having both access and backhaul using only the single frequency band.