RX Diversity Antenna Switching for Active Interference Cancellation
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Solution Overview
Problem
Advanced wireless devices face severe interference issues due to co-existence of multiple radios operating on the same or adjacent frequencies, leading to degradation of receiver performance, as existing interference cancellation techniques are limited in effectiveness and applicability, especially when interference levels are high.
Innovation Solution
A method and apparatus that utilize a diversity receiver chain to selectively switch between interference cancellation and diversity paths based on interference levels, generating a cancellation signal when interference is within a predetermined range, thereby improving spectral efficiency and reducing noise figure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active interference cancellation is applied using prior art RF techniques with a coupling device, then cancellation performance is improved, but the system requires additional hardware components (coupler, wired reference signal path) and cannot be selectively disabled
Solution Approach 1:
The diversity receiver chain is designed to serve multiple functions: it can operate as a standard diversity receiver for normal signal reception, or be reconfigured as an interference cancellation reference path when needed. This multi-functionality eliminates the need for dedicated couplers and wired reference signal paths, reducing hardware complexity while maintaining cancellation capability
Solution Approach 2:
The system uses its own diversity receiver chain to generate the reference signal for interference cancellation, rather than requiring external coupling devices. The diversity chain naturally captures the transmitted signal through wireless coupling, and this self-generated reference signal is used to create the cancellation signal, eliminating the need for separate reference signal extraction hardware
2Object-affected harmful factors
If interference cancellation is always applied, then interference is reduced, but the system cannot adapt to varying interference conditions and may degrade performance when interference is low
Solution Approach 1:
The system dynamically switches between two operational modes based on real-time interference assessment: Mode 1 (interference cancellation mode) when interference exceeds a threshold, and Mode 2 (normal diversity reception mode) when interference is acceptable. This dynamic adaptation allows the system to optimize performance for varying interference conditions rather than applying cancellation continuously
Solution Approach 2:
The system continuously monitors the received signal quality and interference level, using this feedback to determine whether to activate or deactivate the interference cancellation function. The processor assesses signal characteristics in real-time and adjusts the operational mode accordingly, ensuring cancellation is applied only when beneficial
3Reliability
If the diversity receiver chain is always used for interference cancellation, then cancellation is available, but the system loses diversity reception capability when interference is low
Solution Approach 1:
The diversity receiver chain's function is dynamically reconfigured based on interference conditions. When interference is high, the diversity chain is allocated to provide the reference signal for cancellation. When interference is low, the diversity chain returns to its traditional diversity reception role, maintaining reception mode flexibility and optimizing system performance for different operational scenarios
Data Source
AI summary
A method of performing interference cancellation (IC) in a wireless communication device having a receiver comprising at least a primary receiver chain and a diversity receiver chain includes determining an interference level of a transmitted signal on the receiver; determining whether the interference level is within a predetermined range; selecting a first mode of operation if the interference level is within a predetermined range; and selecting a second mode of operation if the interference level is not within the predetermined range. The first mode includes receiving, at the primary receiver chain, a first signal corresponding to the transmitted signal; receiving, at the diversity receiver chain, a second signal corresponding to the transmitted signal for providing to an IC circuit; generating, at the IC circuit, an output signal based on the second signal; and generating a cancellation signal based on the output signal and the first signal.