Digital Transmit Signal Cancellation for Interference Reduction
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Solution Overview
Problem
Existing wireless communication systems face interference issues due to multiple signal interactions, which are difficult to manage with elaborate filter setups that limit frequency hopping and increase complexity and cost.
Innovation Solution
A method and apparatus using a linear passive coupler and transmit signal canceller to identify and partially cancel interference frequencies before amplification, with iterative adjustments to improve interference reduction in both transmit and receive signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If elaborate filter setups are employed to restrict co-site interference conditions, then interference levels are reduced, but spectrum assignment freedom is limited and frequency hopping capability is restricted
Solution Approach 1:
The patent applies preliminary action by calculating interference frequencies in advance using the formula f_interference = |f1 ± f2| before signals are transmitted. The system pre-determines potential interference terms based on the frequency pairs being used, allowing the adaptive filter to be configured beforehand with the correct frequency components, thus eliminating the need for elaborate physical filter setups while maintaining interference suppression capability
Solution Approach 2:
The patent replaces the mechanical/physical filter system with a digital signal processing approach. Instead of using complex analog filters with fixed frequency responses that limit adaptability, the system uses a digital adaptive filter that can dynamically adjust its characteristics through software algorithms, enabling flexible spectrum assignment and frequency hopping while maintaining interference rejection
2Object-affected harmful factors
If elaborate filter setups are employed to restrict co-site interference conditions, then interference levels are reduced, but system complexity and maintenance cost increase
Solution Approach 1:
The patent substitutes complex analog filter hardware with a digital signal processing system that uses standard antennas and simple amplifiers. The interference suppression is achieved through digital algorithms (adaptive filtering) rather than complex physical filter networks, dramatically reducing hardware complexity and maintenance requirements while maintaining effective interference rejection
Solution Approach 2:
The system employs self-service by automatically adapting its filter characteristics based on the detected signal environment. The adaptive filter continuously adjusts its coefficients to optimize interference suppression without requiring manual configuration or complex fixed filter designs, allowing the system to maintain effectiveness while using simple, maintainable hardware
Data Source
AI summary
A system for an omni digital package for reducing interference may include a passive combiner and a transmit signal canceller. The passive combiner may be configured to combine at least two input frequencies to produce a combined signal. The transmit signal canceller may be configured to determine an interference frequency based on a combination of the at least two input frequencies. The transmit signal canceller may include a tap weight determiner configured to determine a weighting coefficient associated with the interference frequency, and a cancellation function configured to perform a cancellation operation to at least partially cancel the interference frequency from the combined signal based on the weighting coefficient.