NLOS Wireless Backhaul Self-Alignment and Interference Cancellation
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Solution Overview
Problem
Current wireless backhaul systems lack self-alignment and realignment of antenna beams, fail to operate in non-line-of-sight environments, and do not effectively cancel interference, leading to reduced spectral efficiency and link reliability, which is inadequate for the increasing capacity demands of micro- and pico-cellular topologies.
Innovation Solution
A wireless non-line of sight backhaul system that enables self-alignment of antenna beams, uses Extreme Interference Cancellation (EIC) and dual polarizations to enhance spectral efficiency, and employs multi-target beam-forming to optimize signal-to-interference and noise ratio (SINR) in various propagation environments, allowing operation with a single radio frequency channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high gain parabolic dishes are used in traditional wireless backhaul systems, then link reliability is improved, but the system requires line-of-sight and manual alignment, reducing adaptability to different propagation environments
Solution Approach 1:
The patent replaces manual mechanical alignment of parabolic dishes with electronic beamforming and adaptive signal processing. The system uses digital signal processing to electronically steer and align beams, eliminating the need for manual mechanical adjustment while maintaining link reliability across varying propagation conditions including non-line-of-sight environments.
Solution Approach 2:
The patent implements dynamic beamforming capabilities that automatically adapt to changing propagation conditions. The system continuously adjusts beam directions and shapes in real-time to track mobile users and compensate for fading, providing both reliability and adaptability without requiring line-of-sight or manual intervention.
2Loss of information
If traditional point-to-point wireless backhaul systems are deployed, then spectral efficiency is maintained, but interference from co-channel systems cannot be canceled, reducing overall system capacity
Solution Approach 1:
The patent converts co-channel interference into useful signal information through advanced signal processing. By treating interference as cancellable noise rather than harmful distortion, the system uses interference cancellation algorithms to recover and utilize signals that would otherwise be lost, thereby improving spectral efficiency while coexisting with multiple co-channel systems.
Solution Approach 2:
The patent introduces signal processing algorithms as intermediaries between transmitted and received signals. These algorithms act as mediators that separate desired signals from interference, enabling the system to operate in spectrally efficient ways even in the presence of co-channel interference by mathematically isolating and canceling interfering components.
3Productivity
If micro-cellular and pico-cellular topologies are deployed to increase capacity density, then network capacity is improved, but the limited range of small cells requires more frequent handovers and complex network management
Solution Approach 1:
The patent implements a universal backhaul system that can operate in both micro-cellular and pico-cellular topologies using the same technology platform. The system provides multi-functional capabilities including wireless backhaul, user access, and interference management, simplifying network management across different cell sizes and deployment scenarios while maintaining high capacity density.
Data Source
AI summary
A non-line of sight backhaul system and method are described that provides self-alignment of the antennas beams of the wireless radios of the system, that provides robust operation in licensed and unlicensed frequency bands, that facilitates the use of a reduced number of frequency channels from M to 1 and that enables operation in a non-line of sight (NLOS) propagation environment.