Interference Signal Cancellation Using Dual Power Dividers
Solution Overview
Problem
Conventional interference signal cancellation methods in communications systems can temporarily increase noise power during parameter adjustments, leading to instability and communication interruptions due to excessive interference signal power.
Innovation Solution
The introduction of a secondary cancellation unit and a control module that adjust the cancellation reference signal settings in conjunction with a primary cancellation unit, ensuring the power of the signal without interference remains within a low threshold range, thereby preventing communication disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parameter adjustment operation (time shift, phase shift, or attenuation) is performed on the cancellation reference signal to make it correspond to the interference signal component, then the interference cancellation effectiveness is improved, but the interference signal power may temporarily increase causing communication interruption
Solution Approach 1:
The patent applies preliminary action by performing parameter adjustment operations (time shift, phase shift, attenuation) on the cancellation reference signal before it is subtracted from the received signal. This ensures that the adjusted cancellation signal properly corresponds to the interference component, preventing temporary power increases that would cause communication interruptions. The adjustment is done in advance to align the cancellation signal characteristics with the actual interference signal.
Solution Approach 2:
The patent implements feedback by continuously monitoring the received signal and dynamically adjusting the parameters of the cancellation reference signal. The system measures the interference signal characteristics and uses this feedback to optimize the time shift, phase shift, and attenuation parameters, ensuring effective cancellation while maintaining signal power within acceptable ranges to prevent communication interruptions.
2Measurement precision
If the cancellation reference signal is adjusted to match the interference signal, then the signal-to-noise ratio is increased, but the complexity of the interference cancellation unit increases
Solution Approach 1:
The patent applies parameter changes by adjusting key parameters of the cancellation reference signal including time shift, phase shift, and attenuation level. These parameter modifications enable the cancellation signal to accurately match the interference signal characteristics, thereby improving the signal-to-noise ratio of the received signal while maintaining a relatively simple cancellation unit structure.
Data Source
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AI summary
Embodiments of the present invention disclose an interference signal cancellation apparatus, including: a first power divider, configured to divide a cancellation reference signal link corresponding to a transmit antenna into a first reference link and a second reference link; a second power divider, configured to: divide a signal receiving link connected to a receive antenna into a first receiving link and a second receiving link, and use the first receiving link as an output link; a primary cancellation unit that is located at the first reference link, and is connected to the signal receiving link by using a coupler; a secondary cancellation unit that is located at the second reference link, and is connected to the second receiving link by using a coupler; and a control module connected to the second receiving link, the primary cancellation unit, and the secondary cancellation unit. The control module may apply a preferred secondary configuration parameter of the secondary cancellation unit to the primary cancellation unit, so that stability and reliability of a communications system are greatly improved.