Zero Division Duplexing MIMO Radio with Adaptive Cancellation
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Solution Overview
Problem
Conventional microwave backhaul radios require precise physical alignment and unobstructed line of sight for high-performance operation, making them impractical for street-level deployments with obstructions, and they cannot support point-to-multipoint configurations effectively.
Innovation Solution
The development of intelligent backhaul radios using zero division duplexing (ZDD) technology, which includes multiple transmit RF chains, adaptable RF transversal filters, and a radio resource controller to cancel transmit leakage, allowing for efficient spectrum usage and operation in obstructed environments without precise antenna alignment, supporting both point-to-point and point-to-multipoint topologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional microwave radios use high gain antennas for high data rates and long range, then communication performance is improved, but precise physical alignment and unobstructed line of sight are required
Solution Approach 1:
The patent segments the antenna system into multiple lower-gain antenna elements arranged in arrays rather than using single high-gain antennas. This segmentation allows the system to achieve comparable or better performance through signal processing and combining multiple elements, eliminating the need for precise physical alignment while maintaining high data rates
Solution Approach 2:
The patent replaces the mechanical alignment system (precise physical positioning of high-gain antennas) with an electronic signal processing system that uses multiple antenna elements and sophisticated combining techniques. This substitution eliminates the need for mechanical precision while achieving the same or better communication performance
2Reliability
If conventional microwave radios are deployed on high towers for unobstructed line of sight, then communication reliability is improved, but deployment cost and complexity increase
Solution Approach 1:
The patent transitions from a single-dimension solution (vertical tower deployment for LOS) to a multi-dimensional solution using antenna arrays with elements arranged in both vertical and horizontal dimensions. This dimensional expansion allows street-level deployment with obstructions while maintaining reliability through spatial diversity and signal processing
Solution Approach 2:
The patent creates a universal antenna array system that can function in both LOS and non-LOS environments, replacing the need for environment-specific deployment solutions. The same multi-element array architecture works whether deployed on towers or at street level, with or without line of sight
3Length of stationary object
If conventional microwave radios use high gain antennas for long range communication, then transmission distance is improved, but the system cannot support point-to-multipoint configurations
Solution Approach 1:
The patent segments the communication function across multiple antenna elements that can independently or collectively serve different directions and purposes. This segmentation enables the same physical infrastructure to support both point-to-point long-range links and point-to-multipoint configurations simultaneously
Solution Approach 2:
The patent implements dynamic beam forming and signal combining capabilities that allow the system to adapt its radiation pattern and communication targets in real-time. This dynamic reconfiguration enables seamless switching between point-to-point and point-to-multipoint modes without changing the physical deployment
Data Source
AI summary
An intelligent backhaul radio is disclosed, which can operate by zero division duplexing for use in PTP or PMP topologies, providing for significant spectrum usage benefits among other benefits. Specific system architectures and structures to enable active cancellation of multiple transmit signals at multiple receivers within a MIMO radio are disclosed. Further disclosed aspects include the adaptive optimization of cancellation parameters or coefficients.