Antenna Diversity Switching with Signature-Pulse Interference Masking
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Solution Overview
Problem
Existing multi-antenna scanning diversity systems face challenges in precisely timing the interference suppression in the audio frequency range due to delays in signal reception and channel bandwidth restrictions, leading to ineffective suppression of change-over interference.
Innovation Solution
A reception system with a diversity processor and interference suppression circuit that uses a pulse-like signature signal to mark the change-over process, ensuring precise timing and effective interference masking by coupling the signature signal with the antenna reception signals before the channel filter, allowing for reliable triggering of interference suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a change-over pulse is used to trigger interference suppression in the audio frequency range, then interference suppression is activated, but precise simultaneity between triggering and interference occurrence cannot be achieved due to signal delays
Solution Approach 1:
The patent introduces a leading edge marker that is generated in advance and fed forward to the interference suppression circuit before the actual interference occurs. This preliminary action allows the interference suppression to be triggered at the exact moment of interference occurrence, eliminating timing delays caused by signal processing chains.
Solution Approach 2:
The patent uses a leading edge marker as an intermediary signal that carries timing information from the diversity processor to the interference suppression circuit. This marker serves as a mediator that synchronizes the triggering of interference suppression with the actual occurrence of interference, bypassing the delays inherent in the audio signal processing path.
2Reliability
If channel bandwidth restriction is applied to protect against adjacent channel interference, then reception quality is improved, but running time equalization becomes impossible due to dynamic bandwidth regulation
Solution Approach 1:
The leading edge marker acts as an intermediary that provides precise timing information independent of the dynamic bandwidth regulation. By feeding this marker directly to the interference suppression circuit, the system achieves accurate timing synchronization without relying on running time equalization that would be incompatible with dynamic bandwidth changes.
Data Source
AI summary
A diversity processing system for providing interference masking signals in an interference suppression circuit. These interference masking signals are generated by an interference detector which through a coupling element couples in a signature signal into a reception signal. This reception signal is then passed to an amplifier, an optional frequency converter, an IF filter, a frequency demodulator and then on to an interference suppression circuit which provides a masking pulse to mask any distortion or interference associated with the diversity switching of antennas during operation.