Adaptive Multi-Path Interference Cancellation Using Gain-Bandwidth Profiles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional adaptive interference cancellation systems struggle to effectively cancel multi-path interference signals that arrive at radio receivers through multiple propagation paths, as they do not account for the time-varying intensity trends of these signals, leading to degraded cancellation depth.
Innovation Solution
The system employs a multi-path interference cancellation method that creates a time-delay domain, gain-bandwidth profile within the closed loop responses of adaptive cancellers, optimizing gain and bandwidth characteristics to match the intensity trends of interference propagation paths, thereby enhancing cancellation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single delay line cancellation system is used, then the system structure remains simple, but the cancellation depth is greatly degraded when multi-path interference occurs
Solution Approach 1:
The patent divides the single cancellation system into multiple parallel cancellation channels, each handling a specific time delay component of the multi-path interference. This segmentation allows each channel to target specific interference paths while maintaining overall system manageability
Solution Approach 2:
The patent extends the cancellation system from a single time-delay dimension to multiple time-delay dimensions by introducing parallel cancellation channels with different delay settings, effectively creating a multi-dimensional cancellation space that can handle multi-path interference
2Measurement precision
If multiple adaptive cancellers are employed to handle multi-path interference, then the cancellation depth is improved, but the device complexity increases
Solution Approach 1:
The patent assigns different local characteristics to each cancellation channel, specifically different time delay values matched to the expected arrival times of multi-path interference components. This allows each channel to be optimized for its specific interference path while contributing to overall cancellation performance
3Ease of operation
If conventional adaptive cancellation systems are used, then the system is easy to operate, but the cancellation performance is degraded when interference signals follow multiple paths with different time delays
Solution Approach 1:
The patent introduces dynamic adaptability to each cancellation channel through automatic gain control circuits that continuously adjust channel gains based on the actual interference conditions. This dynamic adjustment allows the system to adapt to changing multi-path interference patterns while maintaining ease of operation
Solution Approach 2:
The patent employs feedback mechanisms where the output of each cancellation channel is monitored and used to adjust the channel's gain and performance. This feedback loop ensures optimal cancellation performance across varying interference conditions without requiring manual intervention
Data Source
AI summary
A multi-path signal interference cancellation system cancels multiple time delayed signal components of a multi-path interference signal received by a receive antenna and carried on a receiver transmission line of a radio receiver system. The interference cancellation system includes a plurality of adaptive interference canceller circuits, each of which has a synchronous detector, a signal controller and an integrator as essential parts of closed control loops defined by the canceller circuits. The integrator has gain and bandwidth characteristics associated therewith which are adjustable to adjust the gain and bandwidth of each closed control loop. An intensity profile of the multi-path interference signal is generated and stored in a memory. An intensity profile signal from the memory is provided to the integrator of each adaptive interference canceller circuit to adjust the gain and bandwidth of the integrator and the loop in which it is situated to maximize the error detection residual signal-to-noise ratio of each adaptive interference canceller circuit. Each adaptive interference canceller circuit generates a cancellation signal from which a synthesized cancellation signal is generated and effectively injected onto the receiver transmission line to cancel the multiple time delayed signal components of the multi-path interference signal carried thereon so that the radio receiver of the radio receiver system only receives a desired signal.