Selective-Sampling Receiver Interference Suppression
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Solution Overview
Problem
Existing receiver systems for interference suppression are complex and costly, requiring large antenna arrays and sophisticated processing to effectively isolate and subtract interference signals from desired signals.
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, thereby suppressing interference and recovering desired signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If generalized side lobe canceller or co-channel interference mitigation algorithms are used, then interference suppression is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts the interference component from the received signal by using a separate antenna element that receives only interference (null space signal). This extracted interference signal is then used to generate cancellation weights that subtract interference from the desired signal, achieving interference suppression without requiring complex multi-element arrays or sophisticated algorithms.
Solution Approach 2:
The patent creates a simplified copy of the interference signal by using a single antenna element positioned to receive only the interference component. This copy is then processed through simple analog circuitry to generate cancellation weights, replacing the need for complex digital signal processing and large antenna arrays.
2Reliability
If large antenna arrays are used for interference estimation, then interference suppression improves, but manufacturing cost and device complexity increase
Solution Approach 1:
Instead of using multiple antenna elements to estimate interference through complex processing, the patent extracts interference by using a single dedicated antenna element that receives only the interference component. This simplifies the antenna array from multiple elements to a single element, reducing manufacturing cost while maintaining interference estimation accuracy.
Solution Approach 2:
The patent replaces expensive, complex multi-element antenna arrays with a simple, inexpensive single-element antenna structure. The low cost of this simple antenna is compensated by the intelligent signal processing that uses the extracted interference signal to cancel interference from the desired signal.
3Reliability
If sophisticated processing algorithms are used for interference subtraction, then interference suppression is achieved, but processing cost and complexity increase
Solution Approach 1:
The patent replaces complex digital signal processing algorithms with simple analog circuitry. The interference signal is processed through analog multiplication and addition circuits to generate cancellation weights, eliminating the need for complex digital processors, microcontrollers, or sophisticated algorithms.
Solution Approach 2:
The patent creates an analog copy of the interference signal processing path that can be implemented with simple circuitry. By copying the interference signal through analog multiplication with the desired signal, the system achieves interference cancellation without requiring complex digital processing.
Data Source
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.