Microwave Backhaul Interference Cancellation via Signal Subtraction
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Solution Overview
Problem
Conventional microwave backhaul systems face significant interference issues due to back and side lobes, which can lead to substantial energy loss and inefficient spectrum use, and existing solutions like frequency separation complicate frequency planning and are costly to implement.
Innovation Solution
The system employs interference cancellation circuits and beamforming techniques within microwave backhaul assemblies to exchange information and process signals, allowing for the removal of undesired signal components and improving performance by configuring interference cancellation based on received signal strength and using blind source separation to mitigate interference from lobes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frequency separation is used to mitigate interference, then interference between backhaul links is reduced, but frequency planning complexity and implementation cost increase
Solution Approach 1:
The patent changes the parameter of signal processing by introducing interference cancellation circuits that actively process and subtract interfering signals from received signals. This allows operation in the same frequency band without requiring frequency separation, thereby reducing frequency planning complexity while maintaining interference mitigation.
Solution Approach 2:
The patent extracts the interfering signal components from the received signal using interference cancellation circuits. By identifying and removing the harmful interference portion separately, the system can operate without frequency separation while still achieving interference reduction.
2Object-affected harmful factors
If interference cancellation circuits are implemented, then signal interference is reduced, but system complexity increases
Solution Approach 1:
The patent introduces an intermediary interference cancellation circuit that mediates between the received signal and the desired output. This circuit acts as a mediator that processes the signal to remove interference, providing a structured approach to handling complexity rather than directly modifying antenna or frequency planning.
Solution Approach 2:
The patent employs feedback mechanisms where the system monitors received signals, identifies interference components, and adjusts the cancellation process accordingly. This feedback loop allows the interference cancellation to adapt to changing conditions, managing complexity through intelligent control rather than fixed complex hardware.
3Area of stationary object
If back and side lobes are utilized for signal transmission, then coverage area is expanded, but interference to other links increases
Solution Approach 1:
The patent converts the harmful back and side lobes into beneficial components by using interference cancellation circuits to process signals from these lobes. Instead of treating lobes as purely harmful sources of interference, the system captures and processes them, canceling the harmful portions while retaining useful signal energy, thereby expanding effective coverage without proportionally increasing interference.
Solution Approach 2:
The patent changes the parameter of signal processing by applying interference cancellation specifically to signals received from back and side lobes. This allows the system to maintain expanded coverage from multiple lobes while actively managing the interference they generate through parameter-based signal processing rather than physical isolation.
Data Source
AI summary
A first microwave backhaul assembly comprises a first antenna, a front-end circuit, an inter-backhaul-assembly interface circuit, and an interference cancellation circuit. The first antenna is operable to receive a first microwave signal. The front-end circuit is operable to convert the first microwave signal to a lower-frequency digital signal, wherein the lower-frequency digital signal has energy of a second microwave signal and energy of a third microwave signal. The inter-backhaul-assembly interface circuit is operable to receive information from a second microwave backhaul assembly. The interference cancellation circuit is operable to use the information received via the inter-backhaul-assembly interface circuit during processing of the lower-frequency digital signal to remove, from the first microwave signal, the energy of the third microwave signal. The information received via the inter-backhaul-assembly interface may comprise a signal having energy of the second microwave signal.