Selective-Sampling Receiver Interference Suppression

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Solution Overview

Problem

Existing receiver systems for RF signals face complexity and high costs due to the need for complex circuitry and processing to suppress interference, which limits their effectiveness in accurately recovering desired signals amidst noise and interference.

Innovation Solution

A selective-sampling receiver that uses low-complexity, low-cost analog or digital circuitry to align the phase of interference components and sample signals at power minimums, effectively suppressing interference and recovering desired signals by sampling at points where interference is minimized.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If generalized side lobe canceller or co-channel interference mitigation algorithms are used to suppress signal interference, then interference suppression capability is improved, but device complexity and processing requirements increase significantly

Engineering Contradiction:

Improveinterference suppression capabilityVSAvoidreceiver complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The receiver is divided into multiple independent channels (first channel receiving desired signal plus interference, second channel receiving primarily interference). Each channel is processed separately through sampling and reconstruction, with the interference component being subtracted from the desired signal. This segmentation allows simple processing in each channel while achieving complex interference suppression overall.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The interference signal is extracted and isolated in a separate second channel, allowing it to be processed and removed without affecting the desired signal processing. By taking out the interference component and processing it separately, the system achieves interference suppression without requiring complex processing of the entire composite signal.

Inventive Principle:

Principle #2Taking out (Extraction)

2Measurement precision

If complex processing algorithms are applied to estimate and subtract interference from desired signals, then signal recovery quality is improved, but processing time and computational cost increase

Engineering Contradiction:

Improvesignal recovery qualityVSAvoidprocessing time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The interference signal is captured and processed in advance through the second channel, creating a ready-to-use interference estimate before it needs to be subtracted from the desired signal. This preliminary processing of the interference component eliminates the need for time-consuming iterative estimation and subtraction operations on the composite signal.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Complex iterative algorithms for interference estimation and subtraction are replaced with a parallel channel architecture where interference is captured separately and subtracted directly. This substitution of mechanical processing with a structural solution dramatically reduces computational requirements and processing time.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If large number of antenna arrays and costly processing equipment are used for interference suppression, then interference mitigation performance is improved, but manufacturing cost increases

Engineering Contradiction:

Improveinterference mitigation performanceVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The same receiver architecture and processing circuitry is used to perform multiple functions: receiving the composite signal, capturing the interference component separately, processing both signals, and performing subtraction. This multi-functionality eliminates the need for separate specialized hardware for each function, reducing overall system cost.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Instead of using expensive antenna arrays and high-end processing equipment, the system creates a simplified copy of the signal path with a second channel that captures only the interference. This copying approach allows interference suppression using basic, low-cost components rather than expensive specialized hardware.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS8934587B2Selective-sampling receiver

Publication Date: 2015.01.13 WEBER DANIEL

AI summary

A receiver that selectively samples a received signal in order to suppress an interference component of the signal while recovering a desired component. The selective sampling may be accomplished by low cost, low complex analog or digital circuitry. The receiver includes a first input that receives a first signal, including a desired signal component and an interference signal component and a second input that receives a second signal including the interference component only. The first and second signals are then provided to the sampling circuitry. First, the phase of the interference component of the both the first and second signals is aligned. Next, the points in a wave cycle that the second signal is at a power minimum are detected. Finally, first signal is sampled close to the point when the second signal is at the power minimum to recover the desired signal component and suppress the interference component.