Downstream Interference Suppression in Full-Duplex Coaxial Networks
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Solution Overview
Problem
In full duplex communication systems, interference from transmitter signals degrades receiver performance due to leakage and reflections, which existing methods struggle to effectively suppress, especially in coaxial cable networks where coherent and non-coherent interference compounds, affecting signal-to-interference ratio and dynamic range requirements.
Innovation Solution
The system employs a combining element that uses anti-phase combiners and compensation elements to suppress interference by setting phase, gain, and delay parameters of reception signals, exploiting coherency among leakage signals and adapting to minimize interference levels, while also monitoring receiver performance to adjust settings dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex bidirectional transmission is implemented in coaxial cable networks, then spectrum utilization is improved, but receiver performance is degraded by interfering signals from transmitters
Solution Approach 1:
The patent applies preliminary anti-action by pre-processing the received signals through compensation elements that adjust phase, gain, and delay parameters before combining. This preliminary adjustment creates destructive interference patterns that cancel out the transmitter leakage signals before they can degrade the receiver performance, allowing full duplex operation to proceed without performance degradation
Solution Approach 2:
The patent converts the harmful transmitter leakage signals into a beneficial cancellation mechanism. By deliberately introducing signals with opposite phase through the combining element, the harmful interference is transformed into a constructive force that actively suppresses the unwanted signals, enabling both transmit and receive operations to coexist in the same frequency band
2Productivity
If multiple transmit signals are transmitted via multiple coupling devices, then communication capacity is improved, but interference signals are compounded affecting signal-to-interference ratio
Solution Approach 1:
The patent applies local quality by processing each received signal individually through dedicated compensation elements that are specifically tuned for each coupling device's characteristics. Each signal path receives customized phase, gain, and delay adjustments tailored to its specific interference profile, enabling precise local cancellation of interference from each transmitter before the signals are combined
3Adaptability or versatility
If receiver processes combined signal with multiple interfering signals, then full duplex operation is achieved, but dynamic range requirements increase
Solution Approach 1:
The patent applies preliminary action by performing interference cancellation in the analog domain before the signal reaches the digital processing stage. The compensation elements and combining element execute the cancellation operation prior to ADC conversion, removing the need for the receiver to handle large dynamic ranges of both strong interference and weak desired signals simultaneously, thereby reducing overall system complexity
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 reduces interference, improving receiver performance and reducing dynamic range requirements, thereby enhancing signal quality and reducing system costs and power consumption.
Implementation Method 1
the combining element is configured to generate the combined signal with a suppressed level of the interference signals by setting at least a phase of at least one of the reception signals
Implementation Method 2
the combining element is configured to suppress the interference signals by exploiting a coherency among the interference signals inherited from the transmit signals
Implementation Method 3
the combining element is configured to generate the combined signal by combining the multiple reception signals in pairs, so that the reception signals of each pair are combined with a 180 degree phase shift using a respective anti-phase combiner
Data Source
AI summary
An apparatus includes a transmitter, a receiver and a combining element. The transmitter includes multiple coupling devices coupled to a coaxial network via multiple respective ports, and is configured to transmit multiple transmit signals via the coupling devices, and to receive from the coaxial network via the multiple coupling devices multiple reception signals. The receiver is configured to receive a combined signal of the multiple reception signals, interfered by multiple respective interfering signals that originate from the multiple transmit signals, and to process the combined signal to recover data carried in the reception signals. The combining element, included in at least one of the transmitter and the receiver, is configured to receive the multiple reception signals from the respective couplers, and to generate the combined signal with a suppressed level of the interference signals by setting at least a phase of at least one of the reception signals.